3.6l Engine - Service Information Jeep Grand Cherokee WK2

Scheme 1

The 3.6 liter (219.7 CID) flexible fuel V-6 engine features Variable Valve Timing (VVT), Dual Overhead Camshafts (DOHC) and a high-pressure die-cast aluminum cylinder block with steel liners in a 60° configuration. The 3.6 liter engine has a chain driven variable discharge oil pump with a two-stage pressure regulator for improved fuel economy. The exhaust manifolds are integrated into the cylinder heads for reduced weight. The cylinders are numbered from front to rear. The right bank is numbered 1, 3, 5 and the left bank is numbered 2, 4, 6. The firing order is 1-2-3-4-5-6. The engine serial number is located on the left side of the cylinder block at the transmission flange.

ENGINE DIAGNOSIS - INTRODUCTION

Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by routine maintenance.

These malfunctions may be classified as either performance (e.g., engine idles rough and stalls) or mechanical (e.g., a strange noise).

Refer to ENGINE PERFORMANCE DIAGNOSTIC TABLE and ENGINE MECHANICAL DIAGNOSTIC TABLE for possible causes and corrections of malfunctions.

Refer to FUEL SYSTEM article, for the fuel system diagnosis.

Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that can not be isolated with the Service Diagnosis charts. Information concerning additional tests and diagnosis is provided within the following diagnosis

1. Cylinder Compression Pressure Test. Refer to «CYLINDER COMPRESSION PRESSURE LEAKAGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__cylinder-compression-pressure-leakage) .
2. Cylinder Combustion Pressure Leakage Test. Refer to «CYLINDER COMBUSTION PRESSURE LEAKAGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__cylinder-combustion-pressure-leakage) .
3. Engine Cylinder Head Gasket Failure Diagnosis. Refer to «CYLINDER HEAD GASKET»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__cylinder-head-gasket) .
4. Intake Manifold Leakage Diagnosis. Refer to «DIAGNOSIS AND TESTING - INTAKE MANIFOLD LEAKS»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__diagnosis-and-testing-intake-manifold) .

ENGINE PERFORMANCE DIAGNOSTIC TABLE

ENGINE MECHANICAL DIAGNOSTIC TABLE

CYLINDER COMPRESSION PRESSURE LEAKAGE

Note. The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunctions.

Note. Ensure the battery is completely charged and the engine starter motor is in good operating condition. Otherwise the indicated compression pressures may not be valid for diagnosis purposes.

1. Clean the spark plug recesses with compressed air.
2. Remove the spark plugs and record the cylinder number of each spark plug for future reference.
3. Inspect the spark plug electrodes for abnormal firing indicators such as fouled, hot, oily, etc.
4. Disable the fuel system and perform the fuel system pressure release procedure. Refer to «FUEL SYSTEM PRESSURE RELEASE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
5. Insert a compression pressure gauge and rotate the engine with the engine starter motor for three revolutions.
6. Record the compression pressure on the 3rd revolution. Continue the test for the remaining cylinders. NOTE: The recommended compression pressures are to be used only as a guide to diagnosing engine problems. An engine should not be disassembled to determine the cause of low compression unless some malfunction is present.
7. Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cylinder to cylinder.
8. If one or more cylinders have abnormally low compression pressures, repeat the compression test. NOTE: If the same cylinder or cylinders repeat an abnormally low reading on the second compression test, it could indicate the existence of a problem in the cylinder in question.
9. If one or more cylinders continue to have abnormally low compression pressures, perform the cylinder combustion pressure leakage test. Refer to «CYLINDER COMBUSTION PRESSURE LEAKAGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__cylinder-combustion-pressure-leakage) .

CYLINDER COMBUSTION PRESSURE LEAKAGE

The combustion pressure leakage test provides an accurate means for determining engine condition.

Combustion pressure leakage testing will detect

1. Exhaust and intake valve leaks (improper seating).
2. Leaks between adjacent cylinders or into water jacket.
3. Any causes for combustion/compression pressure loss.

1. Check the coolant level and fill as required. DO NOT install the radiator cap.
2. Start and operate the engine until it attains normal operating temperature, then turn the engine OFF.
3. Remove the spark plugs.
4. Remove the oil filler cap.
5. Remove the air cleaner hose.
6. Calibrate the tester according to the manufacturer's instructions. The shop air source for testing should maintain 483 kPa (70 psi) minimum, 1, 379 kPa (200 psi) maximum and 552 kPa (80 psi) recommended.
7. Perform the test procedures on each cylinder according to the tester manufacturer's instructions. Set piston of cylinder to be tested at TDC compression. While testing, listen for pressurized air escaping through the throttle body, tailpipe and oil filler cap opening. Check for bubbles in the radiator coolant.

All gauge pressure indications should be equal, with no more than 25% leakage.

FOR EXAMPLE: At 552 kPa (80 psi) input pressure, a minimum of 414 kPa (60 psi) should be maintained in the cylinder.

Refer to CYLINDER COMBUSTION PRESSURE LEAKAGE DIAGNOSIS CHART .

CYLINDER COMBUSTION PRESSURE LEAKAGE DIAGNOSIS CHART

DIAGNOSTIC PROCEDURES

The following diagnostic procedures are used to determine the source of excessive internal oil Consumption, these procedures and tests apply to vehicles with 50, 000 miles or less.

Note. Engine oil consumption may be greater than normal during engine break-in. Repairs should be delayed until vehicle has been driven at least 7, 500 miles.

Severe service (high ambient temperature, short trips, heavy loading, trailer towing, taxi, off-road, or law enforcement use) may result in greater oil consumption than normal.

Sustained high speed driving and high engine RPM operation may result in increased oil consumption.

Failure to comply with the recommended oil type and viscosity rating, as outlined in the owner's manual, may impact oil economy as well as fuel economy.

Oil consumption may increase with vehicle age and mileage due to normal engine wear.

Note. Because a few drops of external oil leakage per mile can quickly account for the loss of one quart of oil in a few hundred miles, ensure no external engine oil leaks are present.

1. Oil leakage is not the same as oil consumption and all external leakage must be eliminated before any action can be taken to verify and/or correct oil consumption complaints.
2. Verify that the engine has the correct oil level dipstick and dipstick tube installed.
3. Verify that the engine is not being run in an overfilled condition. Check the oil level 15 minutes after a hot shutdown with the vehicle parked on a level surface. In no case should the level be above MAX or the FULL mark on the dipstick.

OIL CONSUMPTION TEST

1. Check the oil level at least 15 minutes after a hot shutdown.
2. If the oil level is low, top off with the proper viscosity and API service level engine oil. Add one bottle of MOPAR® 4-In-1 Leak Detection Dye into the engine oil.
3. Tamper proof the oil pan drain plug, oil filter, dipstick and oil fill cap.
4. Record the vehicle mileage.
5. Instruct the customer to drive the vehicle as usual.
6. Ask the customer to return to the servicing dealer after accumulating 500 miles, Check the oil level at least 15 minutes after a hot shutdown. If the oil level is half way between the "FULL" and "ADD" mark continue with the next step.
7. Using a black light, re-check for any external engine oil leaks, repair as necessary, if no external engine oil leaks are present, continue with oil consumption diagnosis.

OIL CONSUMPTION DIAGNOSIS

1. Check the positive crankcase ventilation (PCV) system. Make sure the system is not restricted and the PCV valve has the correct part number and correct vacuum source (18-20 in. Hg at idle below 3000 ft. above sea level is considered normal).
2. Perform a «CYLINDER COMPRESSION PRESSURE LEAKAGE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__cylinder-compression-pressure-leakage) test and «CYLINDER-TO-CYLINDER LEAKAGE TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__cylinder-to-cylinder-leakage-test) using the standard leak down gauge following manufacturers suggested best practices. NOTE: Verify the spark plugs are not oil saturated. If the spark plugs are oil saturated and compression is good it can be assumed the valve seals or valve guides are at fault.
3. If one or more cylinders have more than 15% leak down further engine tear down and inspection will be required.

TOP 19 REASONS THAT MAY LEAD TO ENGINE OIL CONSUMPTION

1. Tapered and Out-of-Round Cylinders The increased piston clearances permit the pistons to rock in the worn cylinders. While tilted momentarily, an abnormally large volume of oil is permitted to enter on one side of the piston. The rings, also tilted in the cylinder, permit oil to enter on one side. Upon reversal of the piston on each stroke, some of this oil is passed into the combustion chamber.
2. Distorted Cylinders This may be caused by unequal heat distribution or unequal tightening of cylinder head bolts. This condition presents a surface which the rings may not be able to follow completely. In this case, there may be areas where the rings will not remove all of the excess oil. When combustion takes place, this oil will be burned and cause high oil consumption.
3. Improper operation of "PCV "system The main purpose of the Positive Crankcase Ventilation (PCV) valve is to recirculate blow-by gases back from the crankcase area through the engine to consume unburned hydrocarbons. The PCV system usually has a one way check valve and a make up air source. The system uses rubber hoses that route crankcase blow by gases to the intake manifold. Vacuum within the engine intake manifold pulls the blow by gases out of the crankcase into the combustion chamber along with the regular intake air and fuel mixture. The PCV system can become clogged with sludge and varnish deposits and trap blow by gases in the crankcase. This degrades the oil, promoting additional formation of deposit material. If left uncorrected, the result is plugged oil rings, oil consumption, rapid ring wear due to sludge buildup, ruptured gaskets and seals due to crankcase pressurization.
4. Worn Piston Ring Grooves For piston rings to form a good seal, the sides of the ring grooves must be true and flat - not flared or shouldered. Piston rings in tapered or irregular grooves will not seal properly and, consequently, oil will pass around behind the rings into the combustion chamber.
5. Worn, Broken or Stuck Piston Rings When piston rings are broken, worn or stuck to such an extent that the correct tension and clearances are not maintained, this will allow oil to be drawn into the combustion chamber on the intake stroke and hot gases of combustion to be blown down the cylinder past the piston on the power stroke. All of these conditions will result in burning and carbon build up of the oil on the cylinders, pistons and rings.
6. Cracked or Broken Ring Lands Cracked or broken ring lands prevent the rings from seating completely on their sides and cause oil pumping. This condition will lead to serious damage to the cylinders as well as complete destruction of the pistons and rings. Cracked or broken ring lands cannot be corrected by any means other than piston replacement.
7. Worn Valve Stems and Guides When wear has taken place on valve stems and valve guides, the vacuum in the intake manifold will draw oil and oil vapor between the intake valve stems and guides into the intake manifold and then into the cylinder where it will be burned.
8. Bent or Misaligned Connecting Rods Bent or misaligned connecting rods will not allow the pistons to ride straight in the cylinders. This will prevent the pistons and rings from forming a proper seal with the cylinder walls and promote oil consumption. In addition, it is possible that a bearing in a bent connect rod will not have uniform clearance on the connecting rod wrist pin. Under these conditions, the bearing will wear rapidly and throw off an excessive amount of oil into the cylinder.
9. Fuel Dilution If raw fuel is allowed to enter the lubrication system, the oil will become thinner and more volatile and will result in higher oil consumption. The following conditions will lead to higher oil consumption; Excess fuel can enter and mix with the oil via a leaking fuel injector Gasoline contaminated with diesel fuel Restricted air intake Excessive idling
10. Contaminated Cooling Systems Corrosion, rust, scale, sediment or other formations in the water jacket and radiator will prevent a cooling system from extracting heat efficiently. This is likely to cause cylinder distortion thus leading to higher oil consumption.
11. Oil Viscosity The use of oil with a viscosity that is too light may result in high oil consumption. Refer to the vehicle owner's manual for the proper oil viscosity to be used under specific driving conditions and/or ambient temperatures.
12. Dirty Engine Oil Failure to change the oil and filter at proper intervals may cause the oil to be so dirty that it will promote accumulation of sludge and varnish and restrict oil passages in the piston rings and pistons. This will increase oil consumption; dirty oil by nature is also consumed at a higher rate than clean oil.
13. Crankcase Overfull Due to an error in inserting the oil dip stick so that it does not come to a seat on its shoulder, a low reading may be obtained. Additional oil may be added to make the reading appear normal with the stick in this incorrect position which will actually make the oil level too high. If the oil level is so high that the lower ends of the connecting rods touch the oil in the oil pan excessive quantities of oil will be thrown on the cylinder walls and some of it will work its way up into the combustion chamber.
14. Excessively High Oil Pressure A faulty oil pressure relief valve may cause the oil pressure to be too high. The result will be that the engine will be flooded with an abnormally large amount of oil in a manner similar to that which occurs with worn bearings. This condition may also cause the oil filter to burst.
15. Aftermarket Performance Chips and Modification Increasing performance through the use of performance/power enhancement products to a stock or factory engine will increase the chance of excessive oil consumption.
16. Lugging Engine Lugging is running the engine at a lower RPM in a condition where a higher RPM (more power/torque) should be implemented. Especially susceptible on vehicles equipped with a manual transmission. This driving habit causes more stress loading on the piston and can lead to increases in engine oil consumption.
17. Turbocharged Engines There is a possibility for PCV "push-over" due to higher crankcase pressure (as compared to naturally aspirated engines) which is normal for turbocharged engines. This condition causes varying amounts of engine oil to enter the intake manifold, charge air cooler and associated plumbing to and from the charge air cooler, also a leaking turbocharger seal will draw oil into the combustion chamber where it will burn (blue smoke from tail pipe may be present) and form carbon deposits which contribute to further oil consumption as they interfere with proper engine function.
18. Restricted Air Intake Excessive restriction in the air intake system will increase engine vacuum and can increase oil consumption, an extremely dirty air filter would be one example of this situation.
19. Intake Manifold port seals Engines that have a "V" configuration and a "wet valley" (3.3/3.8L) could draw oil into the intake ports due to improper sealing between the intake manifold ports and cylinder head. Causes may include improper torque of intake manifold bolts, corrosion (aluminum intake manifold) and or warped sealing surface.

ENGINE LUBRICATION DIAGNOSTIC TABLE

Scheme 2

Due to the high amounts of failures cased by dust, dirt, moisture and other foreign debris being introduced to the engine during service. Covers or caps are needed to reduce the possible damage that can be caused or created.

Scheme 3

Covers over openings will reduce any possibilities for foreign materials to enter the engine systems. Using miller tool (special tool #10368, Set, Universal Protective Cap), Select the appropriated cover needed to the procedure.

REPAIR DAMAGED OR WORN THREADS

Damaged or worn threads can be repaired. Essentially, this repair consists of

1. Drilling out worn or damaged threads.
2. Tapping the hole with a special Heli-Coil Tap, or equivalent.
3. Installing an insert into the tapped hole to bring the hole back to its original thread size.

FORM-IN-PLACE GASKETS AND SEALERS

Note. All of the sealants mentioned below are not used on every engine, they are listed as a general reference guide. See service information for specific sealer usage.

There are numerous places where form-in-place gaskets are used on the engine. Care must be taken when applying form-in-place gaskets to assure obtaining the desired results. Do not use form-in-place gasket material unless specified. Bead size, continuity, and location are of great importance. Too thin a bead can result in leakage while too much can result in spill-over which can break off and obstruct fluid feed lines. A continuous bead of the proper width is essential to obtain a leak-free gasket. All sealing surfaces that use form-in-place gaskets and sealers must free of grease or oil. Surfaces should be cleaned with Mopar® brake parts cleaner prior to sealer application. After the sealer is applied, the parts should be assembled in no more than 10 minutes.

There are numerous types of form-in-place gasket materials that are used in the engine area. Mopar® Engine RTV GEN II, Mopar® ATF-RTV, and Mopar® Gasket Maker gasket materials, each have different properties and can not be used in place of the other.

MOPAR® ENGINE RTV GEN II is used to seal components exposed to engine oil. This material is a specially designed black silicone rubber RTV that retains adhesion and sealing properties when exposed to engine oil. Moisture in the air causes the material to cure. This material is available in three ounce tubes and has a shelf life of one year. After one year this material will not properly cure. Always inspect the package for the expiration date before use.

MOPAR® ATF RTV is a specifically designed black silicone rubber RTV that retains adhesion and sealing properties to seal components exposed to automatic transmission fluid, engine coolants, and moisture. This material is available in three ounce tubes and has a shelf life of one year. After one year this material will not properly cure. Always inspect the package for the expiration date before use.

MOPAR® GASKET MAKER is an anaerobic type gasket material. The material cures in the absence of air when squeezed between two metallic surfaces. It will not cure if left in the uncovered tube. The anaerobic material is for use between two machined surfaces. Do not use on flexible metal flanges.

MOPAR® BED PLATE SEALANT is a unique (green-in-color) anaerobic type gasket material that is specially made to seal the area between the bed plate and cylinder block without disturbing the bearing clearance or alignment of these components. The material cures slowly in the absence of air when torqued between two metallic surfaces, and will rapidly cure when heat is applied.

MOPAR® THREEBOND ENGINE RTV SEALANT is a unique gasket material that is specially made to retain adhesion and sealing properties when used to seal components exposed to engine oil.

SEALER APPLICATION

Mopar® Gasket Maker material should be applied sparingly 1 mm (0.040 in.) diameter or less of sealant to one gasket surface. Be certain the material surrounds each mounting hole. Excess material can easily be wiped off. Components should be torqued in place within 15 minutes. The use of a locating dowel is recommended during assembly to prevent smearing material off the location.

Mopar® Engine RTV GEN II or ATF RTV gasket material should be applied in a continuous bead approximately 3 mm (0.120 in.) in diameter. All mounting holes must be circled. For corner sealing and "T" joint locations, a 3.17 or 6.35 mm (1/8 or 1/4 in.) drop is placed in the center of the gasket contact area. Uncured sealant may be removed with a shop towel. Components should be torqued in place while the sealant is still wet to the touch (within 10 minutes). The usage of a locating dowel is recommended during assembly to prevent smearing material off the location.

Mopar® Threebond Engine RTV Sealant gasket material should be applied in a continuous bead approximately 3 mm (0.120 in.) in diameter. The gasket surfaces should be cleaned with isopropyl alcohol wipes in preparation for sealant application. All mounting holes must be circled. For corner sealing and "T" joint locations, a 3.17 or 6.35 mm (1/8 or 1/4 in.) drop is placed in the center of the gasket contact area. Uncured sealant may be removed with a shop towel. Components should be assembled within 20 minutes and torqued in place within 45 minutes. The usage of a locating dowel is recommended during assembly to prevent smearing material off the location.

Scheme 4

To ensure engine gasket sealing, proper surface preparation must be performed, especially with the use of aluminum engine components and multi-layer steel cylinder head gaskets.

Never use the following to clean gasket surfaces

1. Metal scraper.
2. Abrasive pad or paper to clean cylinder block and head.
3. High speed power tool with an abrasive pad or a wire brush (1).

Note. Multi-Layer Steel (MLS) head gaskets require a scratch free sealing surface.

Only use the following for cleaning gasket surfaces

1. Solvent or a commercially available gasket remover
2. Plastic or wood scraper (3).
3. Drill motor with 3M Roloc™ Bristle Disc (white or yellow) (2).

SPECIFICATIONS

GENERAL SPECIFICATIONS

CYLINDER BLOCK

PISTONS

PISTON PINS

PISTON RINGS

PISTON RING SIDE CLEARANCE

PISTON RING WIDTH

CONNECTING RODS

CRANKSHAFT MAIN BEARING JOURNALS

CONNECTING ROD JOURNALS

CAMSHAFT

VALVE TIMING-INTAKE VALVES

VALVE TIMING-EXHAUST VALVES

CYLINDER HEAD

VALVES

VALVE SPRING

OIL PRESSURE

TORQUE SPECIFICATIONS

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

1. Perform the fuel pressure release procedure. Refer to «FUEL SYSTEM PRESSURE RELEASE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
2. Disconnect and isolate the negative battery cable.
3. Remove the hood. Refer to «HOOD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
4. Remove the engine cover (1).
5. Remove the air inlet hose (3) and the air cleaner body. Refer to «BODY, AIR CLEANER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
6. Remove the electric vacuum pump (4) and mounting bracket (1). Refer to «PUMP, ELECTRIC VACUUM, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information__removal) . NOTE: Power steering pump not shown in illustration.
7. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
8. If equipped, remove the front skid plate, the front suspension skid plate, the transmission skid plate and the transfer case skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
9. Drain the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
10. Drain the engine oil. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
11. Remove the nut (1) and bolt (4) from the support brackets of the heater core return tube (3).
12. Remove the A/C compressor mounting stud (2).
13. Lower the vehicle.
14. Remove the nut (2) from the support bracket of the heater core return tube (3) and reposition the tube.
15. Remove the vapor purge tube (1) from the fuel purge solenoid (2). Refer to «STANDARD PROCEDURE - QUICK-CONNECT FITTINGS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
16. Remove the PCV hose (1) from the PCV valve (2).
17. Remove the upper intake manifold (2) and insulator. Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
18. Disengage the clips (1), remove the make-up air tube (3) from the left cylinder head cover and reposition the transmission breather hose (2).
19. Disconnect the fuel supply hose (1) from the underbody fuel tube (2). Refer to «STANDARD PROCEDURE - QUICK-CONNECT FITTINGS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
20. Remove the cooling fan module. Refer to «FAN, COOLING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
21. Remove the accessory drive belt (4). Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
22. Remove the generator (8). Refer to «GENERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#charging-service-information) . NOTE: Right catalytic converter shown in illustration, left catalytic converter similar.
23. Disconnect the right and left upstream oxygen sensor connectors (4) from the main wire harness.
24. Loosen the lower catalytic converter flange bolts (3).
25. Remove the upper catalytic converter flange bolts (1) and reposition the right and left catalytic converters (2). NOTE: Left engine mount shown in illustration, right engine mount similar.
26. Remove the bolts (1) and the engine mount heatshield (2) from both the left and right engine mounts. NOTE: Mark the variable valve timing solenoid connectors (2) with a paint pen or equivalent so that they may be reinstalled in their original locations.
27. Disconnect the electrical connectors (2) from the variable valve timing solenoids on the right cylinder head.
28. Disengage the starter harness to main harness retainer (3).
29. Disengage two starter wire harness retainers (1) from the right cylinder head cover.
30. Disconnect the electrical connector (1) from the right Camshaft Position (CMP) sensor.
31. Disengage the main wire harness retainer (2) from the right cylinder head cover mounting stud.
32. Disengage four main wire harness retainers (1) from the right cylinder head cover.
33. Disconnect the oil pump solenoid electrical connector (2).
34. Disengage four wire harness retainers (1).
35. Remove the ground strap (3) from the right engine mount bracket. NOTE: Mark the variable valve timing solenoid connectors (2) with a paint pen or equivalent so that they may be reinstalled in their original locations.
36. Disconnect the electrical connectors (2) from the left variable valve timing solenoids.
37. Disengage two starter wire harness retainers (1) from the left cylinder head cover.
38. Disconnect the A/C compressor electrical connector (1) and disengage the wire harness retainer (2) from the A/C compressor discharge line.
39. Disengage two starter wire harness retainers (1) from the upper intake manifold support brackets.
40. Disengage one main wire harness retainer (3) from the left cylinder head cover and two retainers (2) from the upper intake manifold support brackets.
41. Disconnect the Engine Coolant Temperature (ECT) sensor connector (3).
42. Disconnect the left Camshaft Position (CMP) sensor (5).
43. Disengage one main wire harness retainer (2) from the cylinder head cover and one main wire harness retainer (4) from the cylinder head cover mounting stud.
44. Disengage the main wire harness retainer (1) form the rear of the lower intake manifold.
45. Remove the remaining three bolts (1) and reposition the A/C compressor (2).
46. Remove the upper radiator hose (1) from the engine thermostat housing.
47. Remove the lower radiator hose (1) from the engine coolant pump housing.
48. Disconnect the heater core return hose (1). NOTE: Only two power steering pump mounting bolts are shown in illustration. Another bolt is on the lower end of the pump near the pulley.
49. Remove the three power steering pump mounting bolts (1) and reposition the power steering pump.
50. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
51. If equipped with AWD, remove the front axle (1). Refer to «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/differentials-drive-axles/#front-axle-195fia__removal) .
52. Remove the starter. Refer to «STARTER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/starter/#starting-service-information) .
53. Disengage the starter wire harness retainer (2) and the main wire harness retainer (1) from the engine block.
54. Reinstall the left engine mount bracket (1) and isolator (4) assembly with four bolts (5) and two bolts (3). Tighten all bolts to 61 N.m (45 ft. lbs.).
55. Unclip the transmission cooler line retainer (1) from the upper oil pan flange.
56. Push back the heatshield (1) from the crankshaft position (CKP) sensor.
57. Disconnect the main wire harness from the Crankshaft Position (CKP) sensor (3).
58. Disengage one main wire harness retainer (1) from the engine block and one main wire harness retainer (2) from the right engine mounting bracket.
59. Disconnect and reposition the power cord from the engine block heater (if equipped).
60. Rotate the crankshaft in a clockwise direction until the torque converter bolts (1) are accessible through the starter mounting. Remove the six torque converter bolts (1). NOTE: If equipped with AWD, the rear of the engine must be lowered in order to access the upper transmission to engine bolts.
61. If equipped with AWD, support the transmission with a suitable jack, remove three crossmember brace bolts (1), six crossmember bolts (2) and adjust the jack to lower the rear of the engine.
62. Loosen the bolt (1) securing the transmission fluid level indicator tube (2) to the transmission housing.
63. Remove four upper transmission to engine bolts (1).
64. Disconnect the main harness from the engine injection/ignition harness (1) at the rear of the left cylinder head.
65. Disconnect the main harness from the engine oil pressure/temperature harness (2) at the rear of the left cylinder head.
66. If equipped with AWD, raise the rear of the engine, reinstall six crossmember bolts (2) and three crossmember brace bolts (1). Tighten all bolts to 55 N.m (41 ft. lbs.).
67. Remove the bolt (2) and the torque converter dust shield (3).
68. Remove the side engine to transmission bolt (1).
69. Remove two rubber plugs (1) covering the rear oil seal retainer flange bolts.
70. Remove four transmission to the engine oil pan bolts (1).
71. Lower the vehicle.
72. Remove the bolt (1) and remove the oil level indicator (2).
73. Remove the bolt (2) and the heater core supply tube (1).
74. If equipped with AWD, disengage the transfer case vent hose retainer (1) from the upper intake manifold support bracket (2).
75. Remove the bolts (2) and remove the LH upper intake manifold support brackets (1).
76. Install the Driver Side Engine Lifting Bracket (special tool #10242-1, Brackets, Engine Lifting, Left Side) (1) on the LH cylinder head with bolts (2) provided with the Engine Lifting Bracket. Tighten the bolts to 21 N.m (15 ft. lbs.).
77. Install the Passenger Side Engine Lifting Bracket (special tool #10242-2, Brackets, Engine Lifting, Right Side) (1) on the RH cylinder head with bolts (2) from the Engine Lifting Bracket. Tighten the bolts to 21 N.m (15 ft. lbs.).
78. Reposition the starter wire harness and the main wire harness to the rear of the engine compartment.
79. Position a load-leveling lifting sling (2), such as OTC® 4305 Engine Load Leveler or equivalent, between the engine lifting brackets (3) and an engine hoist (1). NOTE: Left engine mount shown in illustration, right engine mount similar.
80. Support the transmission with a suitable jack.
81. Remove both the left and right engine mount nuts (1). CAUTION: While slowly separating the engine from the vehicle, constant checks must be made to assure proper positioning and that no damage to other components or wiring harnesses occur during separation.
82. Carefully remove the engine from the engine bay area.
83. If required, remove the following components for installation on the replacement engine

1. LH engine mount bracket
2. RH engine mount bracket
3. Accessory drive belt tensioner
4. Upper intake manifold support bracket
5. Heater core return tube
6. Block heater (if equipped)

INSTALLATION - 3.6L ENGINE

Note. If installing a replacement engine, transfer components such as engine mount brackets, block heater, accessories, heater hoses and tubes to the replacement engine.

Scheme 53

Scheme 54

1. If required, remove the upper intake manifold. Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. Install the Driver Side Engine Lifting Bracket (special tool #10242-1, Brackets, Engine Lifting, Left Side) (1) on the LH cylinder head with bolts (2) provided with the Engine Lifting Bracket. Tighten the bolts to 21 N.m (15 ft. lbs.).
3. Install the Passenger Side Engine Lifting Bracket (special tool #10242-2, Brackets, Engine Lifting, Right Side) (1) on the RH cylinder head with bolts (2) from the Engine Lifting Bracket. Tighten the bolts to 21 N.m (15 ft. lbs.).
4. Position a load-leveling lifting sling (2), such as OTC® 4305 Engine Load Leveler or equivalent, between the engine lifting brackets (3) and an engine hoist (1).
5. Reposition the starter wire harness and the main wire harness to the rear of the engine compartment. NOTE: Left engine mount shown in illustration, right engine mount similar.
6. Position the engine in the vehicle while aligning the two locator dowels into the transmission housing.
7. Align the tab on the isolators (3) with the notch in the engine mount brackets (2) and lower the engine so the weight is resting on the isolators.
8. Install the left and right engine mount nuts (1) and tighten to 61 N.m (45 ft.lbs.).
9. Remove the engine lifting brackets and install the LH upper intake manifold support brackets (1). Loosely install the studbolts (2).
10. Route the main wire harness and starter wire harness on the engine.
11. Engage two starter wire harness retainers (1) to the upper intake manifold support brackets.
12. Engage one main wire harness retainer (3) to the left cylinder head cover and two retainers (2) to the upper intake manifold support brackets.
13. Connect the Engine Coolant Temperature (ECT) sensor connector (3).
14. Connect the left Camshaft Position (CMP) sensor (5).
15. Engage one main wire harness retainer (2) to the cylinder head cover and one main wire harness retainer (4) to the cylinder head cover mounting stud.
16. Engage the main wire harness retainer (1) to the rear of the lower intake manifold.
17. Connect the electrical connector (1) to the right Camshaft Position (CMP) sensor.
18. Engage the main wire harness retainer (2) to the right cylinder head cover mounting stud.
19. Engage four main wire harness retainers (1) to the right cylinder head cover.
20. Connect the electrical connectors (2) to the variable valve timing solenoids on the right cylinder head.
21. Engage two starter wire harness retainers (1) to the right cylinder head cover.
22. Engage the starter harness to main harness retainer (3).
23. Connect the oil pump solenoid electrical connector (2).
24. Engage four wire harness retainers (1).
25. Install the ground strap (3) to the right engine mount bracket.
26. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
27. Install the four transmission to the engine oil pan bolts (1). Tighten the bolts to 55 N.m (41 ft. lbs.).
28. Install two rubber plugs (1) covering the rear oil seal retainer flange bolts.
29. Install the side engine to transmission bolt (1). Tighten the bolt to 55 N.m (41 ft. lbs.).
30. Install the torque converter dust shield (3) with the bolt (2). Tighten the bolt to 12 N.m (106 in. lbs.). NOTE: If equipped with AWD, the rear of the engine must be lowered in order to access the upper transmission to engine bolts.
31. If equipped with AWD, support the transmission with a suitable jack, remove three crossmember brace bolts (1), six crossmember bolts (2) and adjust the jack to lower the rear of the engine.
32. Install the four upper transmission to engine bolts (1). Tighten the bolts to 55 N.m (41 ft. lbs.).
33. Install the bolt (1) securing the transmission fluid level indicator tube (2) to the transmission housing and tighten to 12 N.m (106 in. lbs.).
34. Connect the main harness to the engine injection/ignition harness (1) at the rear of the left cylinder head.
35. Connect the main harness to the engine oil pressure/temperature harness (2) at the rear of the left cylinder head.
36. If equipped with AWD, raise the rear of the engine, reinstall six crossmember bolts (2) and three crossmember brace bolts (1). Tighten all bolts to 55 N.m (41 ft. lbs.).
37. Rotate the crankshaft in a clockwise direction and install the six torque converter bolts (1) through the starter mounting. Tighten the bolts to 42 N.m (31 ft. lbs.).
38. Clip the transmission cooler line retainer (1) to the oil pan flange.
39. Engage the starter wire harness retainer (2) and the main wire harness retainer (1) to the engine block.
40. Install the starter. Refer to «STARTER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/starter/#starting-service-information) .
41. Connect the power cord to the engine block heater (if equipped).
42. Connect the main wire harness to the Crankshaft Position (CKP) sensor (3).
43. Engage one main wire harness retainer (1) to the engine block and one main wire harness retainer (2) to the right engine mounting bracket.
44. Position the heatshield (1) over the crankshaft position (CKP) sensor.
45. If equipped with AWD, install the front axle (1). Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/differentials-drive-axles/#front-axle-195fia__installation) .
46. Lower the vehicle.
47. If equipped with AWD, engage the transfer case vent hose retainer (1) to the upper intake manifold support bracket (2).
48. Install the heater core supply tube (1) with one bolt (2) tightened to 12 N.m (106 in. lbs.).
49. Install the oil level indicator (2) with bolt (1) tightened 12 N.m (106 in. lbs.). NOTE: Only two power steering pump mounting bolts are shown in illustration. Another bolt is on the lower end of the pump near the pulley.
50. Position the power steering pump (4) to the mounting bracket. Install the three pump mounting bolts (1) and tighten to 25 N.m (18 ft. lbs.).
51. Install the A/C compressor (2) with three bolts (1) tightened to 25 N.m (18 ft. lbs.).
52. Connect the heater core return hose (1).
53. Install the lower radiator hose (1) to the engine coolant pump housing.
54. Install the upper radiator hose (1) to the engine thermostat housing.
55. Connect the electrical connectors (2) to the left variable valve timing solenoids.
56. Engage two starter wire harness retainers (1) to the left cylinder head cover.
57. Connect the A/C compressor electrical connector (1) and Engage the wire harness retainer (2) to the A/C compressor discharge line. NOTE: Left engine mount shown in illustration, right engine mount similar.
58. Install the engine mount heatshield (2) to both the left and right engine mounts with two bolts (1) tightened to 12 N.m (106 in. lbs.). NOTE: Right catalytic converter shown in illustration, left catalytic converter similar.
59. Install the right and left catalytic converters (2) onto the partially installed lower catalytic converter flange bolts (3).
60. Install the upper catalytic converter flange bolts (1) and tighten all M8 bolts to 23 N.m (17 ft. lbs.).
61. Connect the right and left upstream oxygen sensor connectors (4) to the main wire harness.
62. Install the generator (8). Refer to «GENERATOR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#charging-service-information) .
63. Install the accessory drive belt (4). Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) .
64. Install the cooling fan module. Refer to «FAN, COOLING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
65. Connect the fuel supply hose (1) to the underbody fuel tube (2). Refer to «STANDARD PROCEDURE - QUICK-CONNECT FITTINGS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
66. Install the make-up air tube (3) to the left cylinder head cover and engage the clips (1) to the transmission breather hose (2).
67. Install the upper intake manifold and insulator. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
68. Install the PCV hose (1) to the PCV valve (2).
69. Install the vapor purge tube (1) to the fuel purge solenoid (2). Refer to «STANDARD PROCEDURE - QUICK-CONNECT FITTINGS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
70. Install the nut (2) to the support bracket of the heater core return tube (3) and tighten to 12 N.m (106 in. lbs.). NOTE: Power steering pump not shown in illustration.
71. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
72. Install the A/C compressor mounting stud (2) and tighten to 25 N.m (18 ft. lbs.).
73. Install the nut (1) and bolt (4) to the support brackets of the heater core return tube (3). Tighten to 12 N.m (106 in. lbs.).
74. If equipped, install the transfer case skid plate, the transmission skid plate, the front suspension skid plate and the front skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
75. Lower the vehicle.
76. Install the electric vacuum pump (4) and mounting bracket (1). Refer to «PUMP, ELECTRIC VACUUM, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information__installation) .
77. Install the air inlet hose (3) and the air cleaner body. Refer to «BODY, AIR CLEANER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
78. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
79. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
80. Install the engine cover (1).
81. Install the hood. Refer to «HOOD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
82. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
83. Run the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

Note. The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.

SPECIAL TOOLS

10198 - Holder, Vibration Dampener (Originally Shipped In Kit Number(s) 10223.) 10199 - Installer, Front Crankshaft Oil Seal (Originally Shipped In Kit Number(s) 10223.) 10200-1 - Holder, Timing Chain, Left Side 10200-2 - Holder, Timing Chain, Right Side 10200-3 - Pin 10202 - Locks, Camshaft/Phaser 10202-1 - Lock, Camshaft/Phaser, Right Side 10202-2 - Lock, Camshaft/Phaser, Left Side 10224 - Adapter, Valve Spring (Originally Shipped In Kit Number(s) 10223.) 10242-1 - Brackets, Engine Lifting, Left Side (Originally Shipped In Kit Number(s) 10223.) 10242-2 - Brackets, Engine Lifting, Right Side (Originally Shipped In Kit Number(s) 10223.) 10255 - Installer, Spark Plug Tube 10256 - Installer, Cam Installer, Cam Sensor/ Spark Plug Tube Seal (Originally Shipped In Kit Number(s) 10256.) 10368 - Set, Universal Protective Cap 10369 - Holder, Timing Chain 7700-A - Tester, Cooling System 8189 - Guide Pins (Originally Shipped In Kit Number(s) 8180, 8180CC, 8263, 8263CC.) 8511 - Remover, Seal (Originally Shipped In Kit Number(s) 8283, 8283CC, 8527, 8527CC, 8575, 8575CC, 9975.) 8514 - Pins, Tensioner (Originally Shipped In Kit Number(s) 8283, 8283CC, 8527, 8527CC, 8575, 8575CC, 9975.) 8534B - Support Fixture, Engine (Originally Shipped In Kit Number(s) 8534, 8534B, 8849, 9565.) C-119 - Cylinder Indicator C-3292A - Gauge, Pressure C-3339A - Set, Dial Indicator (Originally Shipped In Kit Number(s) 9202.) C-3422-D - Compressor, Valve Spring C-3685-A - Bloc-Chek Kit C-385 - Compressor, Piston MD998772A - Compressor, Valve Spring (Originally Shipped In Kit Number(s) 8678, 8853, 8854.)

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

Scheme 62

Scheme 63

Scheme 64

Scheme 65

Scheme 66

Scheme 67

Scheme 68

Scheme 69

Scheme 70

Scheme 71

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

Scheme 77

Scheme 78

Scheme 79

Scheme 80

Scheme 81

1. Release the air cleaner housing cover latches (1).
2. Lift the cover (1) and release the cover to housing alignment tabs (2).
3. Remove the air cleaner element (3). CAUTION: Do not use compressed air to clean out the air cleaner housing without first covering the air inlet to the throttle body. Dirt or foreign objects could enter the intake manifold causing engine damage.
4. Remove any dirt or debris from the bottom of the air cleaner housing.

INSTALLATION - AIR CLEANER

1. Install the air cleaner element (3) into the air cleaner housing.
2. Position the cover (1) so that the alignment tabs insert into the lower housing (2).
3. Seat the cover onto the housing and secure the housing cover latches (1).

Scheme 82

1. Disconnect and isolate the negative battery cable.
2. Remove the engine cover (1).
3. Disconnect the electrical connector (2) from the Inlet Air Temperature (IAT) sensor.
4. Loosen the clamp (1) at the throttle body.
5. Loosen the clamp (4) at the air cleaner body.
6. Remove the air inlet hose (3).
7. Disconnect the fresh air makeup hose (4) from the air cleaner body.
8. Disengage the hose retainer (5) from the air cleaner body.
9. Remove the push pin (3).
10. Reposition the hood seal (2) and pull the air cleaner body (1) straight up off of the locating pins.

INSTALLATION - AIR CLEANER BODY

1. Install the air cleaner body (1) straight down on the locating pins while routing the air inlet under the hood seal (2).
2. Install the push pin (3).
3. Engage the hose retainer (5) to the air cleaner body.
4. Install the fresh air makeup hose (4) to the air cleaner body.
5. Install the air inlet hose (3) to the air cleaner body and the throttle body. Tighten the clamps (1) and (4) to 4 N.m (35 in. lbs.).
6. Connect the electrical connector (2) to the Inlet Air Temperature (IAT) sensor.
7. Install the engine cover (1).
8. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Scheme 83

The 3.6L aluminum cylinder heads are a unique design with left and right castings. The exhaust manifolds are integrated into the cylinder heads. The cylinder head features four valves per cylinder with pressed in powdered metal valve guides. The valve guides are not serviceable. The DOHC valvetrain uses roller rocker arms with hydraulic lifters. The cylinder head's camshaft bearing caps are made of powdered metal and the location and direction of each cap is marked on the side of the caps. The spark plug tubes are pressed into the cylinder heads and sealed in place. The tubes are a thin wall design and caution must be taken when working in the spark plug tube area.

CYLINDER HEAD GASKET

A cylinder head gasket leak can be located between adjacent cylinders or between a cylinder and the adjacent water jacket.

Possible indications of the cylinder head gasket leaking between adjacent cylinders are

1. Loss of engine power
2. Engine misfiring
3. Poor fuel economy

Possible indications of the cylinder head gasket leaking between a cylinder and an adjacent water jacket are

1. Engine overheating
2. Loss of coolant
3. Excessive steam (white smoke) emitting from exhaust
4. Coolant foaming

CYLINDER-TO-CYLINDER LEAKAGE TEST

To determine if an engine cylinder head gasket is leaking between adjacent cylinders, follow the procedures in Cylinder Compression Pressure Test. Refer to CYLINDER COMPRESSION PRESSURE LEAKAGE . An engine cylinder head gasket leaking between adjacent cylinders will result in approximately a 50 - 70% reduction in compression pressure.

CYLINDER-TO-WATER JACKET LEAKAGE TEST

VISUAL TEST METHOD

With the engine cool, remove the coolant pressure cap. Start the engine and allow it to warm up until thermostat opens.

If a large combustion/compression pressure leak exists, bubbles will be visible in the coolant.

Scheme 84

Install Cooling System Tester (special tool #7700-A, Tester, Cooling System) or equivalent to pressure cap neck. Start the engine and observe the tester's pressure gauge. If gauge pulsates with every power stroke of a cylinder a combustion pressure leak is evident.

Scheme 85

Combustion leaks into the cooling system can also be checked by using Bloc-Chek Kit (special tool #C-3685-A, Bloc-Chek Kit) or equivalent. Perform test following the procedures supplied with the tool kit.

HYDRAULIC LASH ADJUSTER

A tappet-like noise may be produced from several items. Check the following items.

1. Engine oil level too high or too low. This may cause aerated oil to enter the adjusters and cause them to be spongy.
2. Insufficient running time after rebuilding cylinder head. Low speed running up to 1 hour may be required.
3. Turn engine off and let set for a few minutes before restarting. Repeat this several times after engine has reached normal operating temperature.
4. Low oil pressure.
5. The oil passage in cylinder head gasket or the oil passage to the cylinder head is plugged with debris.
6. Air ingested into oil due to broken or cracked oil pump pick up.
7. Worn valve guides.
8. Rocker arm ears contacting valve spring retainer.
9. Rocker arm loose, adjuster stuck or at maximum extension and still leaves lash in the system.
10. Oil leak or excessive cam bore wear in cylinder head.
11. Faulty lash adjuster.

1. Check lash adjusters for "sponginess" while installed in cylinder head and cam on camshaft at base circle. Depress part of rocker arm over adjuster. Normal adjusters should feel firm when pressed quickly. When pressed very slowly, lash adjusters should collapse.
2. Remove suspected lash adjusters, and replace.
3. Before installation, make sure adjusters are full of oil. This can be verified by little plunger travel when lash adjuster is depressed quickly.

Scheme 86

Scheme 87

Scheme 88

Scheme 89

Scheme 90

Scheme 91

Scheme 92

Scheme 93

Scheme 94

Scheme 95

1. Perform the fuel pressure release procedure. Refer to «FUEL SYSTEM PRESSURE RELEASE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
2. Disconnect and isolate the negative battery cable.
3. Remove the engine cover (1).
4. Remove the air inlet hose (3) and the air cleaner body. Refer to «BODY, AIR CLEANER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Remove the electric vacuum pump (4) and mounting bracket (1). Refer to «PUMP, ELECTRIC VACUUM, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information__removal) . NOTE: Power steering pump not shown in illustration.
6. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
7. If equipped, remove the front skid plate and front suspension skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
8. Drain the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
9. Drain the engine oil. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
10. Remove the nut (1) and bolt (4) from the support brackets of the heater core return tube (3).
11. Remove the A/C compressor mounting stud (2).
12. Lower the vehicle.
13. Remove the nut (2) from the support bracket of the heater core return tube (3) and reposition the tube.
14. Remove the vapor purge tube (1) from the fuel purge solenoid (2). Refer to «STANDARD PROCEDURE - QUICK-CONNECT FITTINGS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
15. Remove the upper and lower intake manifolds (2) and insulator. Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
16. Disengage the clips (1), remove the make-up air tube (3) from the left cylinder head cover and reposition the transmission breather hose (2). NOTE: Right catalytic converter shown in illustration, left catalytic converter similar.
17. Disconnect the left upstream oxygen sensor connector (4) from the main wire harness.
18. Loosen the lower catalytic converter flange bolts (3).
19. Remove the upper catalytic converter flange bolts (1) and reposition the catalytic converter (2).
20. Remove the accessory drive belt (4). Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
21. Disconnect the A/C compressor electrical connector (1) and disengage the wire harness retainer (2) from the A/C compressor discharge line.
22. Remove the remaining three bolts (1) and reposition the A/C compressor (2).
23. Disconnect the Engine Coolant Temperature (ECT) sensor electrical connector (3).
24. Disconnect the ignition coil capacitor electrical connector.
25. Disengage the injection/ignition harness connector (1) and the engine oil pressure/temperature harness connector (3) from the retainer bracket (2) on the rear of the left cylinder head.
26. Disengage two starter wire harness retainers (1) from the upper intake manifold support brackets.
27. Disengage one main wire harness retainer (3) from the left cylinder head cover and two retainers (2) from the upper intake manifold support brackets.
28. Remove the bolts (2) and remove the LH upper intake manifold support brackets (1).
29. Remove the spark plugs. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
30. Remove the cylinder head covers, lower and upper oil pans, crankshaft vibration damper and engine timing cover. Refer to «COVER(S), ENGINE TIMING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Take this opportunity to measure timing chain wear. Refer to «Engine/Valve Timing - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
31. Lower the vehicle. CAUTION: When aligning timing marks, always rotate engine by turning the crankshaft. Failure to do so will result in valve and/or piston damage.
32. Rotate the crankshaft CW to place the number one piston at TDC on the exhaust stroke by aligning the dimple (4) on the crankshaft with the block/bearing cap junction (5). The left side cam phaser arrows (2) should point toward each other and be parallel to the valve cover sealing surface (3). The right side cam phaser arrows (7) should point away from each other and the scribe lines (9) should be parallel to the valve cover sealing surface (8). CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
33. Mark the direction of rotation on the timing chain using a paint pen or equivalent to aid in reassembly. CAUTION: When the timing chains are removed and the cylinder heads are still installed, DO NOT rotate the camshafts or crankshaft without first locating the proper crankshaft position. Failure to do so will result in valve and/or piston damage.
34. Reset the LH cam chain tensioner by lifting the pawl (1), pushing back the piston (2) and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (3). Refer to «Engine/Valve Timing - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Minor rotation of a camshaft (a few degrees) may be required to install the camshaft phaser lock.
35. Install the LH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser) (4).
36. Loosen both the intake oil control valve (6) and exhaust oil control valve (2).
37. Remove the LH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser) (4).
38. Remove the oil control valve (2) from the left side exhaust cam phaser and pull the phaser off of the camshaft.
39. Remove the oil control valve (6) from the left side intake cam phaser and pull the phaser off of the camshaft.
40. Remove the LH cam chain tensioner arm (1).
41. Remove two T30 bolts (6) and the LH cam chain tensioner (5).
42. Remove two T30 bolts (4) and the LH cam chain guide (2).
43. Remove the left camshafts. Refer to «CAMSHAFT, ENGINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the rocker arms are to be reused, identify their positions so that they can be reassembled into their original locations.
44. Remove the rocker arms. Refer to «ROCKER ARM, VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the hydraulic lifters are to be reused, identify their positions so that they can be reassembled into their original locations.
45. If required, remove the hydraulic lifters. Refer to «LIFTER(S), HYDRAULIC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
46. Using the sequence shown in illustration, remove the cylinder head retaining bolts. NOTE: Right head gasket shown in illustration, left head gasket similar. WARNING: The multi-layered steel head gaskets have very sharp edges that could cause personal injury if not handled carefully. NOTE: The head gasket (1) crimps the locating dowels (2) and the dowels may pull out of the engine block when the head gasket is removed.
47. Remove the cylinder head and gasket (1). Discard the gasket. CAUTION: Do not lay the cylinder head on its gasket sealing surface, due to the design of the cylinder head gasket, any distortion to the cylinder head sealing surface may prevent the gasket from properly sealing resulting in leaks.
48. If required, remove the Engine Coolant Temperature (ECT) sensor (4).
49. If required, remove the bolt (2) and the ignition coil capacitor (1).
50. If required, remove the bolt (3) and the engine wire harness retainer bracket (5).

RIGHT

Scheme 96

Scheme 97

Scheme 98

Scheme 99

Scheme 100

Scheme 101

1. Perform the fuel pressure release procedure. Refer to «FUEL SYSTEM PRESSURE RELEASE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
2. Disconnect and isolate the negative battery cable.
3. Remove the engine cover (1).
4. Disconnect the electrical connector (2) from the Inlet Air Temperature (IAT) sensor.
5. Loosen the clamp (1) at the throttle body.
6. Loosen the clamp (4) at the air cleaner body.
7. Remove the air inlet hose (3).
8. Remove the electric vacuum pump (4) and mounting bracket (1). Refer to «PUMP, ELECTRIC VACUUM, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information__removal) .
9. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
10. If equipped, remove the front skid plate and front suspension skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
11. Drain the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
12. Drain the engine oil. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
13. Lower the vehicle.
14. Remove the PCV hose (1) from the PCV valve (2).
15. Remove the upper and lower intake manifolds (2) and insulator. Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
16. Disconnect the right upstream oxygen sensor connector (4) from the main wire harness.
17. Loosen the lower catalytic converter flange bolts (3).
18. Remove the upper catalytic converter flange bolts (1) and reposition the catalytic converter (2).
19. Remove the accessory drive belt (4). Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
20. Remove the generator (8). Refer to «GENERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#charging-service-information) .
21. Remove the bolt (1) and remove the oil level indicator (2).
22. Remove the bolt (2) and the heater core supply tube (1).
23. Disconnect the ignition coil capacitor electrical connector.
24. Remove the studbolt (3) and remove the upper intake manifold support bracket (2).
25. Remove the spark plugs. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
26. Remove the cylinder head covers, lower and upper oil pans, crankshaft vibration damper and engine timing cover. Refer to «COVER(S), ENGINE TIMING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Take this opportunity to measure timing chain wear. Refer to «Engine/Valve Timing - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
27. Lower the vehicle. CAUTION: When aligning timing marks, always rotate engine by turning the crankshaft. Failure to do so will result in valve and/or piston damage.
28. Rotate the crankshaft CW to place the number one piston at TDC on the exhaust stroke by aligning the dimple (4) on the crankshaft with the block/bearing cap junction (5). The left side cam phaser arrows (2) should point toward each other and be parallel to the valve cover sealing surface (3). The right side cam phaser arrows (7) should point away from each other and the scribe lines (9) should be parallel to the valve cover sealing surface (8). CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
29. Mark the direction of rotation on the timing chain using a paint pen or equivalent to aid in reassembly. CAUTION: When the timing chains are removed and the cylinder heads are still installed, DO NOT rotate the camshafts or crankshaft without first locating the proper crankshaft position. Failure to do so will result in valve and/or piston damage.
30. Reset the RH cam chain tensioner by pushing back the tensioner piston and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (1). NOTE: Minor rotation of a camshaft (a few degrees) may be required to install the camshaft phaser lock.
31. Install the RH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser) (5).
32. Loosen both the intake oil control valve (2) and exhaust oil control valve (7).
33. Remove the RH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser) (5).
34. Remove the oil control valve (2) from the right side intake cam phaser and pull the phaser off of the camshaft.
35. Remove the oil control valve (7) from the right side exhaust cam phaser and pull the phaser off of the camshaft.
36. Remove the RH cam chain tensioner arm (6).
37. Remove two T30 bolts (4) and the RH cam chain tensioner (3).
38. Remove three T30 bolts (2) and the RH cam chain guide (1).
39. Remove the right camshafts. Refer to «CAMSHAFT, ENGINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the rocker arms are to be reused, identify their positions so that they can be reassembled into their original locations.
40. Remove the rocker arms. Refer to «ROCKER ARM, VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the hydraulic lifters are to be reused, identify their positions so that they can be reassembled into their original locations.
41. If required, remove the hydraulic lifters. Refer to «LIFTER(S), HYDRAULIC, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
42. Using the sequence shown in illustration, remove the cylinder head retaining bolts. WARNING: The multi-layered steel head gaskets have very sharp edges that could cause personal injury if not handled carefully. NOTE: The head gasket (1) crimps the locating dowels (2) and the dowels may pull out of the engine block when the head gasket is removed.
43. Remove the cylinder head and gasket. Discard the gasket. CAUTION: Do not lay the cylinder head on its gasket sealing surface, due to the design of the cylinder head gasket, any distortion to the cylinder head sealing surface may prevent the gasket from properly sealing resulting in leaks.
44. If required, remove the bolt (2) and the ignition coil capacitor (1).

CLEANING

To ensure engine gasket sealing, proper surface preparation must be performed, especially with the use of aluminum engine components and multi-layer steel cylinder head gaskets.

Note. Multi-Layer Steel (MLS) head gaskets require a scratch free sealing surface.

1. Remove all gasket material from cylinder head and block. Refer to «Engine - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . Be careful not to gouge or scratch the aluminum head sealing surface.
2. Clean all engine oil passages. CAUTION: Non-compressible debris such as oil, coolant or RTV sealants that are not removed from bolt holes can cause the aluminum casting to crack when tightening the bolts.
3. Clean out the cylinder head bolt holes in the engine block.

Scheme 102

1. Check cylinder head warpage with a straight edge (2) and feeler gauge (1).
2. Cylinder head must be flat within specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .
3. Verify that the valve tappets move freely in theirs bores and that they have been rotating.
4. Inspect camshaft bearing journals for scoring.
5. Remove carbon and varnish deposits from inside of valve guides with a reliable guide cleaner.
6. Inspect the following components and verify that they are within specification : Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) . Camshafts Valve Tappets Springs Valve Seats Valve Guides Valves

LEFT

Scheme 103

Scheme 104

Scheme 105

Scheme 106

Scheme 107

1. If removed, install the Engine Coolant Temperature (ECT) sensor (4) and tighten to 11 N.m (97 in. lbs.).
2. If removed, install the ignition coil capacitor (1) with a M6 bolt (2) tightened to 10 N.m (89 in. lbs.).
3. If removed, install the engine wire harness retainer bracket (5) with a T30 bolt (3) tightened to 12 N.m (106 in. lbs.). CAUTION: The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced. NOTE: Typical cylinder head bolt shown in illustration.
4. Check cylinder head bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced. NOTE: Right head gasket shown in illustration, left head gasket similar. CAUTION: When cleaning cylinder head and cylinder block surfaces, DO NOT use a metal scraper because the surfaces could be cut or ground. Use ONLY a wooden or plastic scraper.
5. Clean and prepare the gasket sealing surfaces of the cylinder head and block. Refer to «Engine - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . CAUTION: Non-compressible debris such as oil, coolant or RTV sealants that are not removed from bolt holes can cause the aluminum casting to crack when tightening the bolts.
6. Clean out the cylinder head bolt holes in the engine block. WARNING: The multi-layered steel head gaskets have very sharp edges that could cause personal injury if not handled carefully. CAUTION: The cylinder head gaskets are not interchangeable between the left and right cylinder heads and are clearly marked (3) with "R" for right and "L" for left.
7. Position the new cylinder head gasket (1) on the locating dowels (2).
8. Position the cylinder head onto the cylinder block. Make sure the cylinder head seats fully over the locating dowels. NOTE: Do not apply any additional oil to the bolt threads.
9. Install the eight head bolts finger tight.
10. Tighten the cylinder head bolts in the sequence shown in illustration, following this 9 step torque plus angle method. Tighten according to the following torque values: Step 1: All to 30 N.m (22 ft. lbs.) Step 2: All to 45 N.m (33 ft. lbs.) Step 3: All + 75° Turn Do not use a torque wrench for this step. Step 4: All + 50° Turn Do not use a torque wrench for this step. Step 5: Loosen all fasteners in reverse of sequence shown in illustration Step 6: All to 30 N.m (22 ft. lbs.) Step 7: All to 45 N.m (33 ft. lbs.) Step 8: All + 70° Turn Do not use a torque wrench for this step. Step 9: All + 70° Turn Do not use a torque wrench for this step. NOTE: If the hydraulic lifters are being reused, reassemble them into their original locations.
11. If removed, install the hydraulic lifters. Refer to «LIFTER(S), HYDRAULIC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the rocker arms are being reused, reassemble them into their original locations.
12. Install the rocker arms and camshafts. Refer to «CAMSHAFT, ENGINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
13. Rotate the camshafts CW to TDC by positioning the alignment holes (1) vertically.
14. Install the LH cam chain guide (2) with two bolts (4). Tighten the T30 bolts (4) to 12 N.m (106 in. lbs.).
15. Install the LH cam chain tensioner (5) to the cylinder head with two bolts (6). Tighten the T30 bolts (6) to 12 N.m (106 in. lbs.).
16. Reset the LH cam chain tensioner (5) by lifting the pawl (3), pushing back the piston and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (7). Refer to «Engine/Valve Timing - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
17. Install the LH tensioner arm (1).
18. Press the LH intake cam phaser onto the intake camshaft. Install and hand tighten the oil control valve. CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
19. Drape the left side cam chain over the LH intake cam phaser and onto the idler sprocket (1) so that the arrow (3) is aligned with the plated link (2) on the cam chain.
20. While maintaining this alignment, route the cam chain around the exhaust and intake cam phasers so that the plated links are aligned with the phaser timing marks (1). Position the left side cam phasers so that the arrows (3) point toward each other and are parallel to the valve cover sealing surface (5). Press the exhaust cam phaser onto the exhaust cam, install and hand tighten the oil control valve (2). NOTE: Minor rotation of a camshaft (a few degrees) may be required to install the camshaft phaser or phaser lock.
21. Install the LH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser) (4) and tighten the oil control valves (2) and (6) to 150 N.m (110 ft. lbs.).
22. Remove the LH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser).
23. Remove the Tensioner Pin (special tool #8514, Pins, Tensioner) (1) from the LH cam chain tensioner.
24. Rotate the crankshaft CW two complete revolutions stopping when the dimple (4) on the crankshaft is aligned the with the block/bearing cap junction (5).
25. While maintaining this alignment, verify that the arrows on the left side cam phasers (2) point toward each other and are parallel to the valve cover sealing surface (3) and that the right side cam phaser arrows (7) point away from each other and the scribe lines (9) are parallel to the valve cover sealing surface (8).
26. There should be 12 chain pins (2) between the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3).
27. If the engine timing is not correct, repeat this procedure.
28. Install the engine timing cover, crankshaft vibration damper, upper and lower oil pans and cylinder head covers. Refer to «COVER(S), ENGINE TIMING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
29. Install the LH upper intake manifold support brackets (1). Loosely install the studbolts (2).
30. Engage two starter wire harness retainers (1) to the upper intake manifold support brackets.
31. Engage one main wire harness retainer (3) to the left cylinder head cover and two retainers (2) to the upper intake manifold support brackets.
32. Install the spark plugs. Tighten to 17.5 N.m (13 ft. lbs.). Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
33. Connect the ignition coil capacitor electrical connector.
34. Engage the injection/ignition harness connector (1) and the engine oil pressure/temperature harness connector (3) to the retainer bracket (2) on the rear of the left cylinder head.
35. Connect the Engine Coolant Temperature (ECT) sensor electrical connector (3).
36. Install the A/C compressor (2) with three bolts (1) tightened to 25 N.m (18 ft. lbs.).
37. Connect the A/C compressor electrical connector (1) and Engage the wire harness retainer (2) to the A/C compressor discharge line.
38. Install the accessory drive belt (4). Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) . NOTE: Right catalytic converter shown in illustration, left catalytic converter similar.
39. Install the left catalytic converter (2) onto the partially installed lower catalytic converter flange bolts (3).
40. Install the upper catalytic converter flange bolts (1) and tighten all M8 bolts to 23 N.m (17 ft. lbs.).
41. Connect the left upstream oxygen sensor connector (4) to the main wire harness.
42. Install the make-up air tube (3) to the left cylinder head cover and engage the clips (1) to the transmission breather hose (2).
43. Install the upper and lower intake manifolds. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
44. Install the vapor purge tube (1) to the fuel purge solenoid (2). Refer to «STANDARD PROCEDURE - QUICK-CONNECT FITTINGS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
45. Install the nut (2) to the support bracket of the heater core return tube (3) and tighten to 12 N.m (106 in. lbs.). NOTE: Power steering pump not shown in illustration.
46. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
47. Install the A/C compressor mounting stud (2) and tighten to 25 N.m (18 ft. lbs.).
48. Install the nut (1) and bolt (4) to the support brackets of the heater core return tube (3). Tighten to 12 N.m (106 in. lbs.).
49. If equipped, install the front skid plate and front suspension skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
50. Lower the vehicle.
51. Install the electric vacuum pump (4) and mounting bracket (1). Refer to «PUMP, ELECTRIC VACUUM, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information__installation) .
52. Install the air inlet hose (3) and the air cleaner body. Refer to «BODY, AIR CLEANER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
53. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
54. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
55. Install the engine cover (1).
56. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
57. Run the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

Note. The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.

Scheme 108

Scheme 109

1. If removed, install the ignition coil capacitor (1) with a M6 bolt (2) tightened to 10 N.m (89 in. lbs.). CAUTION: The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced. NOTE: Typical cylinder head bolt shown in illustration.
2. Check cylinder head bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced. CAUTION: When cleaning cylinder head and cylinder block surfaces, DO NOT use a metal scraper because the surfaces could be cut or ground. Use ONLY a wooden or plastic scraper.
3. Clean and prepare the gasket sealing surfaces of the cylinder head and block. Refer to «Engine - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . CAUTION: Non-compressible debris such as oil, coolant or RTV sealants that are not removed from bolt holes can cause the aluminum casting to crack when tightening the bolts.
4. Clean out the cylinder head bolt holes in the engine block. WARNING: The multi-layered steel head gaskets have very sharp edges that could cause personal injury if not handled carefully. CAUTION: The cylinder head gaskets are not interchangeable between the left and right cylinder heads and are clearly marked (3) with "R" for right and "L" for left.
5. Position the new cylinder head gasket (1) on the locating dowels (2).
6. Position the cylinder head onto the cylinder block. Make sure the cylinder head seats fully over the locating dowels. NOTE: Do not apply any additional oil to the bolt threads.
7. Install the eight head bolts finger tight.
8. Tighten the cylinder head bolts in the sequence shown in illustration, following this 9 step torque plus angle method. Tighten according to the following torque values: Step 1: All to 30 N.m (22 ft. lbs.) Step 2: All to 45 N.m (33 ft. lbs.) Step 3: All + 75° Turn Do not use a torque wrench for this step. Step 4: All + 50° Turn Do not use a torque wrench for this step. Step 5: Loosen all fasteners in reverse of sequence shown in illustration Step 6: All to 30 N.m (22 ft. lbs.) Step 7: All to 45 N.m (33 ft. lbs.) Step 8: All + 70° Turn Do not use a torque wrench for this step. Step 9: All + 70° Turn Do not use a torque wrench for this step. NOTE: If the hydraulic lifters are being reused, reassemble them into their original locations.
9. If removed, install the hydraulic lifters. Refer to «LIFTER(S), HYDRAULIC, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the rocker arms are being reused, reassemble them into their original locations.
10. Install the rocker arms and camshafts. Refer to «CAMSHAFT, ENGINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . CAUTION: Do not rotate the camshafts more than a few degrees independently of the crankshaft. Valve to piston contact could occur resulting in possible valve damage. If the camshafts need to be rotated more than a few degrees, first move the pistons away from the cylinder heads by rotating the crankshaft counterclockwise to a position 30° before-top-dead-center. Once the camshafts are returned to their top-dead-center position, rotate the crankshaft clockwise to return the crankshaft to top-dead-center.
11. Verify that the camshafts are set at TDC by positioning the alignment holes (1) vertically.
12. Install the RH cam chain guide (1) with three bolts (2). Tighten the T30 bolts (2) to 12 N.m (106 in. lbs.).
13. Install the RH cam chain tensioner (3) to the engine block with two bolts (4). Tighten the T30 bolts (4) to 12 N.m (106 in. lbs.).
14. Reset the RH cam chain tensioner (3) by pushing back the tensioner piston and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (5).
15. Install the RH tensioner arm (6).
16. Press the RH exhaust cam phaser onto the exhaust camshaft. Install and hand tighten the oil control valve. CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
17. Drape the right side cam chain over the RH exhaust cam phaser and onto the idler sprocket (1) so that the dimple (2) is aligned with the plated link (3) on the cam chain.
18. While maintaining this alignment, route the cam chain around the exhaust and intake cam phasers so that the plated links are aligned with the phaser timing marks (1). Position the right side cam phasers so that the arrows (3) point away from each other and the scribe lines (4) are parallel to the valve cover sealing surface (6). Press the intake cam phaser onto the intake cam, install and hand tighten the oil control valve (2). NOTE: Minor rotation of a camshaft (a few degrees) may be required to install the camshaft phaser or phaser lock.
19. Install the RH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser) (5) and tighten the oil control valves (2) and (7) to 150 N.m (110 ft. lbs.).
20. Remove the RH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser).
21. Remove the Tensioner Pin (special tool #8514, Pins, Tensioner) (6) from the RH cam chain tensioner.
22. Rotate the crankshaft CW two complete revolutions stopping when the dimple (4) on the crankshaft is aligned the with the block/bearing cap junction (5).
23. While maintaining this alignment, verify that the arrows on the left side cam phasers (2) point toward each other and are parallel to the valve cover sealing surface (3) and that the right side cam phaser arrows (7) point away from each other and the scribe lines (9) are parallel to the valve cover sealing surface (8).
24. There should be 12 chain pins (2) between the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3).
25. If the engine timing is not correct, repeat this procedure.
26. Install the engine timing cover, crankshaft vibration damper, upper and lower oil pans and cylinder head covers. Refer to «COVER(S), ENGINE TIMING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
27. Install the spark plugs. Tighten to 17.5 N.m (13 ft. lbs.). Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
28. Connect the ignition coil capacitor electrical connector.
29. Install the upper intake manifold support bracket (2) with the studbolt (3) hand tight.
30. Install the heater core supply tube (1) with one bolt (2) tightened to 12 N.m (106 in. lbs.).
31. Install the oil level indicator (2) with bolt (1) tightened 12 N.m (106 in. lbs.).
32. Install the generator (8). Refer to «GENERATOR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#charging-service-information) .
33. Install the accessory drive belt (4). Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) .
34. Install the right catalytic converter (2) onto the partially installed lower catalytic converter flange bolts (3).
35. Install the upper catalytic converter flange bolts (1) and tighten all M8 bolts to 23 N.m (17 ft. lbs.).
36. Connect the right upstream oxygen sensor connectors (4) to the main wire harness.
37. Install the upper and lower intake manifolds. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
38. Install the PCV hose (1) to the PCV valve (2).
39. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
40. If equipped, install the front skid plate and front suspension skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
41. Lower the vehicle.
42. Install the electric vacuum pump (4) and mounting bracket (1). Refer to «PUMP, ELECTRIC VACUUM, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information__installation) .
43. Install the air inlet hose (3) to the air cleaner body and the throttle body. Tighten the clamps (1) and (4) to 4 N.m (35 in. lbs.).
44. Connect the electrical connector (2) to the Inlet Air Temperature (IAT) sensor.
45. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
46. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
47. Install the engine cover (1).
48. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
49. Run the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

Note. The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.

Scheme 110

The 3.6L engine is equipped with Variable Valve Timing (VVT). This system adjusts the timing of all four camshafts independently using solenoids and oil control valves to direct oil pressure into the camshaft phaser assemblies. The camshaft phaser assembly advances and/or retards camshaft timing to improve engine performance, mid-range torque, idle quality, fuel economy, and reduce emissions. The four phasers are located on the front of the camshafts, behind the VVT solenoids, inside of the engine timing cover. The exhaust phasers are identified with EXH and the intake phasers are identified with INT. The exhaust phaser has a clockspring, the intake phaser does not. The camshaft sprockets are integrated with the camshaft phaser and are serviced as an assembly. Do not attempt to disassemble the phasers, they are not serviceable. Phasers are interchangeable between the right and left cylinder heads but should be installed in the same location as removed.

The 3.6L engine has an Oil Control Valve (OCV) for each phaser. The OCV also acts as a bolt for mounting the Phaser to the camshaft. The OCVs spool valve is spring loaded and should move freely within the OCV body. The four OCVs are identical but should be installed in the same location as removed.

Scheme 111

Each phaser position is adjusted using regulated oil pressure through the Oil Control Valve (OCV) (3). To begin phaser movement, a voltage signal is applied to the VVT solenoid (1) to extend or retract the solenoid pintle (4). The pintle pushes against an internal spool valve (2) within the OCV moving the valve forwards and backwards to direct oil flow.

Scheme 112

At engine startup, system oil pressure overcomes spring pressure and unlocks the phaser lock-pin (1) in preparation for phasing. The phasers remain in this position until a PCM signal is given to pulse-width modulate the VVT solenoid. At engine shutdown, as oil pressure is reduced, both Phasers return to their lock-pin position (1). However, because the exhaust Phaser needs to travel to a position above and beyond the standard camshaft clockwise rotation, the assistance of a clock spring is required. The intake Phaser on the other hand, simply relies on the torsional resistance from the valvetrain to push it back towards lock-pin position.

Scheme 113

The position of the spool valve (1) inside the OCV (2) determines which ports and chambers inside the phaser are being fed, either to advance (3), hold (4) or retard (5) the timing of the phaser sprocket relative to the camshaft. The spool valve also returns oil from the chambers to the sump (6). The Camshaft Position (CMP) sensor monitors the position of the camshaft with respect to the crankshaft and provides feedback to the PCM. As oil pressure pushes against the vanes (6) of the phaser rotor, the rotor begins to move. Since this rotor is physically attached to the camshaft, rotor rotation causes the camshaft position to rotate relative to the standard sprocket (7) position.

Scheme 114

Scheme 115

Scheme 116

Scheme 117

Scheme 118

Scheme 119

Scheme 120

1. Remove the upper intake manifold, left ignition coils and left cylinder head cover. Refer to «COVER(S), CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. Remove the right ignition coils and all spark plugs. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) . CAUTION: When aligning timing marks, always rotate engine by turning the crankshaft. Failure to do so will result in valve and/or piston damage.
3. Mount Dial Indicator Set (special tool #C-3339A, Set, Dial Indicator) (1) to a stationary point on the engine, such as the number three cylinder ignition coil mount. Position the indicator probe into the number one cylinder, rotate the crankshaft clockwise (as viewed from the front) to place the number one cylinder piston at top-dead-center on the exhaust stroke and set the indicator dial to zero.
4. The left side cam phaser SCRIBE LINES (3) should face away from each other and the ARROWS (1) should point toward each other and be parallel to the cylinder head cover mounting surface (2) when the number one cylinder piston is positioned at top-dead-center on the exhaust stroke. NOTE: The phaser markings (1 and 3) could align with either an external or internal chain link. Either alignment is acceptable as long as there are twelve chain pins between the markings.
5. There should be twelve chain pins (2) BETWEEN the exhaust cam phaser triangle marking (3) and the intake cam phaser circle marking (1) as viewed from either the front or rear of the cam phasers.
6. Mark both sides of the cam chain at the phaser timing marks (1 and 3) using a paint pen or equivalent to aid in reassembly. NOTE: It may be necessary to rock the camshaft slightly (a few degrees) with a wrench (4) when installing the camshaft phaser lock.
7. Install the (special tool #10202-2, Lock, Camshaft/Phaser, Left Side) (1) against the cylinder head cover mounting surface with the tool number facing up.
8. Loosen, but do not remove, the exhaust oil control valve (2) and the intake oil control valve (3).
9. Remove the (special tool #10202-2, Lock, Camshaft/Phaser, Left Side) (1). NOTE: Graphic shows engine timing cover removed for clarity.
10. Using (special tool #10200-3, Pin) (2), lift the pawl off of the rack (3). While holding the pawl off of the rack, push (special tool #10200-1, Holder, Timing Chain, Left Side) (1) into place between the cylinder head and the cam chain guide to force the rack and piston back into the tensioner body. The holder remains in place while the phasers are removed. Refer to «Engine/Valve Timing - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
11. Remove the oil control valve (4) and pull the left side exhaust cam phaser off of the camshaft.
12. Remove the oil control valve (3) and pull the left side intake cam phaser off of the camshaft.

Scheme 121

Scheme 122

Scheme 123

Scheme 124

Scheme 125

Scheme 126

Scheme 127

Scheme 128

1. Remove the upper intake manifold, right ignition coils and right cylinder head cover. Refer to «COVER(S), CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. Remove the left ignition coils and all spark plugs. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) . CAUTION: When aligning timing marks, always rotate engine by turning the crankshaft. Failure to do so will result in valve and/or piston damage.
3. Mount Dial Indicator Set (special tool #C-3339A, Set, Dial Indicator) (1) to a stationary point on the engine, such as the cylinder head cover mounting surface. Position the indicator probe into the number one cylinder, rotate the crankshaft clockwise (as viewed from the front) to place the number one piston at top-dead-center on the exhaust stroke and set the indicator dial to zero.
4. The right side cam phaser ARROWS (2) should point away from each other and the SCRIBE LINES (1) should be parallel to the cylinder head cover mounting surface (3) when the right side number one cylinder piston is positioned at top-dead-center on the exhaust stroke. NOTE: The phaser markings (1 and 3) could align with either an external or internal chain link. Either alignment is acceptable as long as there are twelve chain pins between the markings.
5. There should be twelve chain pins (2) BETWEEN the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3) as viewed from either the front or rear of the cam phasers.
6. Mark both sides of the cam chain at the phaser timing marks (1 and 3) using a paint pen or equivalent to aid in reassembly. NOTE: It may be necessary to rock the camshaft slightly (a few degrees) with a wrench (4) when installing the camshaft phaser lock.
7. Install the (special tool #10202-1, Lock, Camshaft/Phaser, Right Side) (1) against the cylinder head cover mounting surface with the tool number facing up.
8. Loosen, but do not remove, the exhaust oil control valve (3) and the intake oil control valve (2).
9. Remove the (special tool #10202-1, Lock, Camshaft/Phaser, Right Side) (1). NOTE: Early production engines have an M6 bolt (1). Late production engines have an M8 bolt (1). If the bolt is an M6 (10 mm head), use Timing Chain Holder 10200-2. If the bolt is an M8 (13 mm head), use Timing Chain Holder 10369. CAUTION: Do not insert the Timing Chain Holder into position without first compressing the tensioner. The Timing Chain Holder is not designed to compress the tensioner and excessive force can damage the timing chain tensioner arm.
10. Use the timing chain to compress the tensioner by slightly rotating the exhaust camshaft clockwise (4). Insert (special tool #10200-2, Holder, Timing Chain, Right Side) (1) (early production) or (special tool #10369, Holder, Timing Chain) (1) (late production) into place between the cylinder head boss and the tensioner arm to hold the tensioner in the compressed position. The Timing Chain Holder remains in place while the phasers are removed. NOTE: If the Timing Chain Holder (1) does not engage or slips from position, wedge a trim stick (2) or equivalent between the front cover and the tensioner arm (3) to push the tensioner arm towards the rear of the engine and then repeat the previous step.
11. Remove the oil control valve (3) and pull the right side exhaust cam phaser off of the camshaft.
12. Remove the oil control valve (2) and pull the right side intake cam phaser off of the camshaft.

Scheme 129

Scheme 130

1. Verify that the indicator dial (1) is set to zero when the right side number one cylinder piston is positioned at top-dead-center on the exhaust stroke.
2. Verify that the camshafts are set at top-dead-center by positioning the alignment holes (1) vertically. NOTE: The Timing Chain Holder (1) should still be in place as inserted during the Removal procedure. If required, the Timing Chain Holder can be reinserted by repeating Step 10 of the Removal procedure. Refer to «ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Minor rotation of a camshaft (a few degrees) may be required to install the camshaft phaser.
3. Route the cam chain around the left intake cam phaser while aligning the paint mark with the phaser timing mark (1). Press the left intake cam phaser onto the intake camshaft. Install and hand tighten the oil control valve (7).
4. While maintaining this alignment, route the cam chain around the exhaust cam phaser so that the paint mark is aligned with the phaser timing mark (3). Press the exhaust cam phaser onto the exhaust cam, install and hand tighten the oil control valve (4).
5. The SCRIBE LINES (5) on the cam phasers should face away from each other and the ARROWS (6) should point toward each other and be parallel to the cylinder head cover mounting surface. There should be twelve chain pins (2) BETWEEN the exhaust cam phaser triangle marking (3) and the intake cam phaser circle marking (1). NOTE: It may be necessary to rock the camshaft slightly (a few degrees) with a wrench (4) when installing the camshaft phaser lock.
6. Install the (special tool #10202-2, Lock, Camshaft/Phaser, Left Side) (1) against the cylinder head cover mounting surface with the tool number facing up.
7. Tighten the oil control valves (2) and (3) to 150 N.m (110 ft. lbs.).
8. Remove the Camshaft Phaser Lock (1) and the Timing Chain Holder.
9. Rotate the crankshaft clockwise two complete revolutions stopping when the right side number one cylinder piston is again positioned at top-dead-center on the exhaust stroke. To assure correct engine timing, verify the following; The indicator dial is set to ZERO when the right side number one cylinder piston is positioned at top-dead-center on the exhaust stroke. The SCRIBE LINES (3) on the left side cam phasers face away from each other. The ARROWS (4) on the left side cam phasers point toward each other and are parallel to the cylinder head cover mounting surface. There are twelve chain pins (2) BETWEEN the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3).
10. If the engine timing is not correct, repeat this procedure.
11. Install the spark plugs. Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
12. Install the right ignition coils. Refer to «COIL, IGNITION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
13. Install the left cylinder head cover and left ignition coils. Refer to «COVER(S), CYLINDER HEAD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
14. Install the upper intake manifold and air cleaner housing assembly. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
15. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
16. Start the engine and perform the appropriate POWERTRAIN VERIFICATION TEST located in appropriate Electrical Diagnostics article. Cam/Crank Variation Relearn Target Coefficient Relearn

Note. Following the first restart after a DTC driven phaser replacement, clear all DTCs and verify that subsequent restarts do not set any additional codes. for any DTCs that reset. Refer to appropriate Electrical Diagnostics article. .

Scheme 131

Scheme 132

1. Verify that the indicator dial (1) is set to zero when the right side number one cylinder piston is positioned at top-dead-center on the exhaust stroke.
2. Verify that the camshafts are set at top-dead-center by positioning the alignment holes (1) vertically. NOTE: The Timing Chain Holder (1) should still be in place as inserted during the Removal procedure. If required, the Timing Chain Holder can be reinserted by installing the exhaust cam phaser and repeating Step 10 of the Removal procedure. Refer to «ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Minor rotation of a camshaft (a few degrees) may be required to install the camshaft phaser.
3. Route the cam chain around the right exhaust cam phaser while aligning the paint mark with the phaser timing mark (1). Press the right exhaust cam phaser onto the exhaust camshaft. Install and hand tighten the oil control valve (7).
4. While maintaining this alignment, route the cam chain around the intake cam phaser so that the paint mark is aligned with the phaser timing mark (3). Press the intake cam phaser onto the intake cam, install and hand tighten the oil control valve (4).
5. The ARROWS (5) on the cam phasers should point away from each other and the SCRIBE LINES (6) should be parallel to the cylinder head cover mounting surface. There should be twelve chain pins (2) BETWEEN the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3). NOTE: It may be necessary to rock the camshaft slightly (a few degrees) with a wrench (4) when installing the camshaft phaser lock.
6. Install the (special tool #10202-1, Lock, Camshaft/Phaser, Right Side) (1) against the cylinder head cover mounting surface with the tool number facing up.
7. Tighten the oil control valves (2) and (3) to 150 N.m (110 ft. lbs.).
8. Remove the Camshaft Phaser Lock (1) and the Timing Chain Holder.
9. Rotate the crankshaft clockwise two complete revolutions stopping when the right side number one cylinder piston is again positioned at top-dead-center on the exhaust stroke. To assure correct engine timing, verify the following; The indicator dial is set to ZERO when the right side number one cylinder piston is positioned at top-dead-center on the exhaust stroke. The ARROWS (4) on the right side cam phasers point away from each other. The SCRIBE LINES (5) on the right side cam phasers are parallel to the cylinder head cover mounting surface. There are twelve chain pins (2) BETWEEN the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3).
10. If the engine timing is not correct, repeat this procedure.
11. Install the spark plugs. Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
12. Install the left ignition coils. Refer to «COIL, IGNITION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
13. Install the right cylinder head cover and right ignition coils. Refer to «COVER(S), CYLINDER HEAD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
14. Install the upper intake manifold and air cleaner housing assembly. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
15. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
16. Start the engine and perform the appropriate POWERTRAIN VERIFICATION TEST located in appropriate Electrical Diagnostics article. Cam/Crank Variation Relearn Target Coefficient Relearn

Note. Following the first restart after a DTC driven phaser replacement, clear all DTCs and verify that subsequent restarts do not set any additional codes. for any DTCs that reset. Refer to appropriate Electrical Diagnostics article. .

Scheme 133

The 3.6L engine uses a Dual Over Head Camshaft (DOHC) configuration. The camshafts are a nodular cast iron design and have a pressed on magnetic timing wheel that is magnetic encoded. The two Camshaft Position (CMP) sensors are located between the timing wheels. Attached to the rear of the right exhaust camshaft is a centrifuge which is part of the crankcase ventilation system. The centrifuge is used to separate oil droplets from the crankcase gases before they enter the PCV valve. Four bearing journals are machined into the camshaft. Camshaft end play is controlled by two thrust walls that border the nose piece journal.

Scheme 134

Note. RH camshafts shown in illustration, LH camshafts similar.

The camshaft has precisely machined (egg shaped) lobes to provide accurate valve timing and duration. The camshaft is driven by the crankshaft via drive sprockets and chains.

Scheme 135

Note. Right intake camshaft shown in illustration, other camshafts similar.

1. Remove the cylinder head cover. Refer to «COVER(S), CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. Mount Dial Indicator Set (special tool #C-3339A, Set, Dial Indicator) (1) to a stationary point at the front of the engine. Locate the probe perpendicular against the nose of the camshaft.
3. Move the camshaft all the way to the rear of its travel.
4. Zero the dial indicator.
5. Move the camshaft forward to the limit of travel and read the dial indicator. Compare the measured end play to the specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .

Scheme 136

1. Remove the upper intake manifold, all ignition coils, all spark plugs, left cylinder head cover and left cam phasers. Refer to «ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. Rotate the camshafts counterclockwise to position the alignment holes (1) approximately 30° before top-dead-center. This places the camshafts in the neutral position (no valve load). NOTE: Camshaft bearing caps should have been marked during engine manufacturing. For example, the number one exhaust camshaft bearing cap is marked "1E->". The caps should be installed with the notch forward.
3. Loosen the camshaft bearing cap bolts in the sequence shown in illustration. NOTE: When the camshaft is removed the rocker arms may slide downward, mark the rocker arms before removing the camshaft.
4. Remove the camshaft bearing caps and the camshafts.

Scheme 137

1. Remove the upper intake manifold, all ignition coils, all spark plugs, right cylinder head cover and right cam phasers. Refer to «ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Camshaft bearing caps should have been marked during engine manufacturing. For example, the number one exhaust camshaft bearing cap is marked "1E->". The caps should be installed with the notch forward.
2. Loosen the camshaft bearing cap bolts in the sequence shown in illustration. NOTE: When the camshaft is removed the rocker arms may slide downward, mark the rocker arms before removing the camshaft.
3. Remove the camshaft bearing caps and the camshafts.

Scheme 138

Note. RH intake camshaft shown in illustration, other camshafts similar.

1. Inspect camshaft bearing journals (4) for damage and binding. If journals are binding, check the cylinder head for damage. Also check cylinder head oil holes for clogging.
2. Check the surface of the cam lobes (5) for abnormal wear (3). Measure and compare the unworn area (1) to the worn area (2). Replace camshafts that are not within specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .

Scheme 139

1. Lubricate the camshaft journals with clean engine oil.
2. Install the left side camshaft(s) with the alignment holes (1) positioned approximately 30° before top-dead-center. This will place the camshafts at the neutral position (no valve load) easing the installation of the camshaft bearing caps.
3. Install the camshaft bearing caps and hand tighten the retaining bolts to 2 N.m (18 in. lbs.). NOTE: Caps are identified numerically (1 through 4), intake or exhaust (I or E) and should be installed from the front to the rear of the engine. All caps should be installed with the notch forward so that the stamped arrows (<) on the caps point toward the front of the engine.
4. Tighten the bearing cap retaining bolts in the sequence shown in illustration to 9.5 N.m (84 in. lbs.).
5. Rotate the camshafts clockwise to top-dead-center by positioning the alignment holes (1) vertically.
6. Install the left cam phasers, cylinder head cover, spark plugs, ignition coils and the upper intake manifold. Refer to «ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Note. The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.

Scheme 140

1. Lubricate camshaft journals with clean engine oil.
2. Install the right side camshaft(s) at top-dead-center by positioning the alignment holes (1) vertically. This will place the camshafts at the neutral position (no valve load) easing the installation of the camshaft bearing caps.
3. Install the camshaft bearing caps and hand tighten the retaining bolts to 2 N.m (18 in. lbs.). NOTE: Caps are identified numerically (1 through 4), intake or exhaust (I or E) and should be installed from the front to the rear of the engine. All caps should be installed with the notch forward so that the stamped arrows (<) on the caps point toward the front of the engine.
4. Tighten the bearing cap retaining bolts in the sequence shown in illustration to 9.5 N.m (84 in. lbs.).
5. Install the right cam phasers, cylinder head cover, spark plugs, ignition coils and the upper intake manifold. Refer to «ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Note. The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.

Scheme 141

The cylinder head covers are made of a carbon and fiberglass composite. The cylinder head covers are not interchangeable from side-to-side. The cylinder head covers are sealed with a press-in-place gasket that is designed to isolate the cover from the cylinder head for improved NVH. There are two dowel pins on the outboard side of the cover flange to locate the cover to holes in the cylinder head. RTV is used to seal the T-joint at the timing cover, cylinder head and cylinder head cover.

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

1. Disconnect and isolate the negative battery cable.
2. Remove the air inlet hose and upper intake manifold (2). Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Cover the open intake ports (1) to prevent debris from entering the engine.
4. Remove the insulator (2) from the LH cylinder head cover.
5. Disengage the clips (1), remove the make-up air tube (3) from the left cylinder head cover and reposition the transmission breather hose (2). NOTE: Mark the variable valve timing solenoid connectors (2) with a paint pen or equivalent so that they may be reinstalled in their original locations.
6. Disconnect the electrical connectors (2) from the left variable valve timing solenoids.
7. Disengage two starter wire harness retainers (1) from the left cylinder head cover.
8. Mark the variable valve timing solenoids (2 and 4) with a paint pen or equivalent so that they may be reinstalled in their original locations.
9. Remove the variable valve timing solenoids. Refer to «SOLENOID, VARIABLE VALVE TIMING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
10. Disengage one main wire harness retainer (3) from the left cylinder head cover.
11. Disconnect the left Camshaft Position (CMP) sensor (5).
12. Disengage one main wire harness retainer (2) from the cylinder head cover and one main wire harness retainer (4) from the cylinder head cover mounting stud. NOTE: The RH CMP sensor is shown in illustration, the LH CMP sensor is similar. If removing both RH and LH CMP sensors, mark the sensors so they can be installed in their original locations.
13. Remove the camshaft position sensor. Refer to «SENSOR, CAMSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
14. Disengage two injection/ignition harness retainers (1) from the left cylinder head cover.
15. Remove the ignition coils (2). Refer to «COIL, IGNITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
16. Loosen ten cylinder head cover mounting bolts (1) and two studbolts (2) and remove the cylinder head cover.
17. Remove and discard the cylinder head cover gasket (1).
18. The spark plug tube seals (2) can be reused if not damaged. CAUTION: Do not use oil based liquids, wire brushes, abrasive wheels or metal scrapers to clean the engine gasket surfaces. Use only isopropyl (rubbing) alcohol, along with plastic or wooden scrapers. Improper gasket surface preparation may result in engine fluid leakage.
19. Remove all residual sealant (1) from the cylinder head, timing chain cover and cylinder head cover mating surfaces. Refer to «Engine - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

RIGHT CYLINDER HEAD COVER

Scheme 150

Scheme 151

Scheme 152

Scheme 153

Scheme 154

1. Disconnect and isolate the negative battery cable.
2. Remove the air inlet hose and upper intake manifold (2). Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Cover the open intake ports (1) to prevent debris from entering the engine. NOTE: Mark the variable valve timing solenoid connectors (2) with a paint pen or equivalent so that they may be reinstalled in their original locations.
4. Disconnect the electrical connectors (2) from the variable valve timing solenoids on the right cylinder head.
5. Disengage the starter harness to main harness retainer (3).
6. Disengage two starter wire harness retainers from the right cylinder head cover (1).
7. Mark the variable valve timing solenoids (2 and 4) with a paint pen or equivalent so that they may be reinstalled in their original locations.
8. Remove the variable valve timing solenoids. Refer to «SOLENOID, VARIABLE VALVE TIMING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
9. Disengage four main wire harness retainers (1) from the right cylinder head cover.
10. Disconnect the electrical connector (1) from the right Camshaft Position (CMP) sensor.
11. Disengage the main wire harness retainer (2) from the right cylinder head cover mounting stud. NOTE: If removing both RH and LH CMP sensors, mark the sensors so they can be installed in their original locations.
12. Remove the camshaft position sensor. Refer to «SENSOR, CAMSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
13. Disengage three injection/ignition harness retainers (1) from the right cylinder head cover. NOTE: The LH ignition coils are shown in illustration, the RH ignition coils are similar.
14. Remove the ignition coils (2). Refer to «COIL, IGNITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
15. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
16. Loosen the bolt (1) securing the transmission fluid level indicator tube (2) to the transmission housing.
17. Remove the upper transmission to engine bolt (1) and reposition the transmission oil level indicator tube (2).
18. Lower the vehicle.
19. Remove the PCV valve (1). Refer to «VALVE, POSITIVE CRANKCASE VENTILATION (PCV), 3.6L, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) .
20. Loosen nine cylinder head cover mounting bolts (1) and three studbolts (2) and remove the cylinder head cover. NOTE: The LH cylinder head cover is shown in illustration, the RH cylinder head cover is similar.
21. Remove and discard the cylinder head cover gasket (1).
22. The spark plug tube seals (2) can be reused if not damaged. NOTE: The LH cylinder head cover T-joints are shown in illustration, the RH cylinder head cover T-joints are similar. CAUTION: Do not use oil based liquids, wire brushes, abrasive wheels or metal scrapers to clean the engine gasket surfaces. Use only isopropyl (rubbing) alcohol, along with plastic or wooden scrapers. Improper gasket surface preparation may result in engine fluid leakage.
23. Remove all residual sealant (1) from the cylinder head, timing chain cover and cylinder head cover mating surfaces. Refer to «Engine - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 155

Scheme 156

1. Install the cylinder head cover gasket (1).
2. The spark plug tube seals (2) can be reused if not damaged.
3. If required, install new spark plug tube seals (2) in the cylinder head cover: Lubricate the spark plug tube seal inner and outer diameters with clean engine oil. Place the spark plug tube seal (2) on the Cam Sensor/Spark Plug Tube Seal Installer (special tool #10256, Installer, Cam Installer, Cam Sensor/ Spark Plug Tube Seal) (1). Push the seal into the cylinder head cover until the base of the seal is seated. Remove the tool.
4. Clean the timing engine timing cover, cylinder head and cylinder head cover mating surfaces with isopropyl alcohol in preparation for sealant application. CAUTION: Engine assembly requires the use of a unique sealant that is compatible with engine oil. Using a sealant other than Mopar® Threebond Engine RTV Sealant may result in engine fluid leakage. CAUTION: Following the application of Mopar® Threebond Engine RTV Sealant to the gasket surfaces, the components must be assembled within 20 minutes and the attaching fasteners must be tightened to specification within 45 minutes. Prolonged exposure to the air prior to assembly may result in engine fluid leakage.
5. Apply a 2 to 3 mm wide bead of Mopar® Threebond Engine RTV Sealant (1) to the two engine timing cover to cylinder head T-joints as shown in illustration.
6. Align the locator pins (1) to the cylinder head and install the cylinder head cover.
7. Tighten the cylinder head cover bolts and double ended studs in the sequence shown in illustration to 12 N.m (106 in. lbs.).
8. If removed, install the spark plugs. Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
9. Install the ignition coils. Refer to «COIL, IGNITION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
10. Engage two injection/ignition harness retainers (1) to the left cylinder head cover.
11. Refer to the markings made at disassembly and install the variable valve timing solenoids (2 and 4) in their original locations. Refer to «SOLENOID, VARIABLE VALVE TIMING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
12. Connect the electrical connectors (2) to the left variable valve timing solenoids.
13. Engage two starter wire harness retainers (1) to the left cylinder head cover.
14. Engage one main wire harness retainer (3) to the left cylinder head cover. NOTE: The RH CMP sensor is shown in illustration, the LH CMP sensor is similar. If both RH and LH CMP sensors where removed, install them into their original locations.
15. Install the camshaft position sensor. Refer to «SENSOR, CAMSHAFT POSITION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
16. Connect the electrical connector (5) to the left Camshaft Position (CMP) sensor.
17. Engage one main wire harness retainer (2) to the cylinder head cover and one main wire harness retainer (4) to the cylinder head cover mounting stud.
18. Install the make-up air tube (3) to the left cylinder head cover and engage the clips (1) to the transmission breather hose (2).
19. Install the insulator (2) to the two alignment posts (3) on top of the LH cylinder head cover.
20. Install the upper intake manifold (1), support brackets and air inlet hose. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
21. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Note. The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.

Note. The LH cylinder head cover is shown in illustration, the RH cylinder head cover is similar.

Scheme 157

1. Install the cylinder head cover gasket (1).
2. The spark plug tube seals (2) can be reused if not damaged.
3. If required, install new spark plug tube seals (2) in the cylinder head cover: Lubricate the spark plug tube seal inner and outer diameters with clean engine oil. Place the spark plug tube seal (2) on the Cam Sensor/Spark Plug Tube Seal Installer 10256 (1). Push the seal into the cylinder head cover until the base of the seal is seated. Remove the tool. NOTE: The LH cylinder head cover T-joint is shown in illustration, the RH cylinder head cover T-joint is similar.
4. Clean the timing engine timing cover, cylinder head and cylinder head cover mating surfaces with isopropyl alcohol in preparation for sealant application. CAUTION: Engine assembly requires the use of a unique sealant that is compatible with engine oil. Using a sealant other than Mopar® Threebond Engine RTV Sealant may result in engine fluid leakage. CAUTION: Following the application of Mopar® Threebond Engine RTV Sealant to the gasket surfaces, the components must be assembled within 20 minutes and the attaching fasteners must be tightened to specification within 45 minutes. Prolonged exposure to the air prior to assembly may result in engine fluid leakage.
5. Apply a 2 to 3 mm wide bead of Mopar® Threebond Engine RTV Sealant (1) to the two engine timing cover to cylinder head T-joints as shown in illustration.
6. Align the locator pins (1) to the cylinder head and install the cylinder head cover.
7. Tighten the cylinder head cover bolts and double ended studs in the sequence shown in illustration to 12 N.m (106 in. lbs.). NOTE: The LH ignition coils are shown in illustration, the RH ignition coils are similar.
8. If removed, install the spark plugs. Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
9. Install the ignition coils (2). Refer to «COIL, IGNITION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
10. Engage three injection/ignition harness retainers (1) to the right cylinder head cover.
11. Refer to the markings made at disassembly and install the variable valve timing solenoids (2 and 4) in their original locations. Refer to «SOLENOID, VARIABLE VALVE TIMING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
12. Connect the electrical connectors (2) to the variable valve timing solenoids on the right cylinder head.
13. Engage two starter wire harness retainers to the right cylinder head cover (1).
14. Engage the starter harness to main harness retainer (3).
15. Engage four main wire harness retainers (1) to the right cylinder head cover. NOTE: If both RH and LH CMP sensors where removed, install them into their original locations.
16. Install the camshaft position sensor. Refer to «SENSOR, CAMSHAFT POSITION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
17. Connect the electrical connector (1) to the right Camshaft Position (CMP) sensor.
18. Engage the main wire harness retainer (2) to the right cylinder head cover mounting stud.
19. Install the PCV valve (1). Refer to «VALVE, POSITIVE CRANKCASE VENTILATION (PCV), 3.6L, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) .
20. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
21. Install the transmission oil level indicator tube (2) with the upper transmission to engine bolt (1) tightened to 55 N.m (41 ft. lbs.).
22. Install the bolt (1) securing the transmission fluid level indicator tube (2) to the transmission housing and tighten to 12 N.m (106 in. lbs.).
23. Lower the vehicle.
24. If removed, install the insulator (2) to the two alignment posts (3) on top of the LH cylinder head cover.
25. Install the upper intake manifold (1), support brackets and air inlet hose. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
26. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Note. The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.

DIAGNOSIS AND TESTING - HYDRAULIC LIFTER(S) NOISE DIAGNOSIS

Proper noise diagnosis is essential in locating the source of an NVH complaint. Locating a lash adjuster (tappet) type noise can sometimes be difficult. As a result, an initial misdiagnosis may occur.

Refer to the following chart for possible causes and correction of a lash adjuster (tappet) type noise.

LASH ADJUSTER (TAPPET) NOISE CHART

Scheme 158

Note. The LH cylinder head hydraulic lifters are shown in illustration, the RH cylinder head hydraulic lifters are similar.

1. Disconnect and isolate the negative battery cable.
2. Remove the camshaft(s). Refer to «CAMSHAFT, ENGINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the rocker arms are to be reused, identify their positions so that they can be reassembled into their original locations.
3. Remove the rocker arm(s). Refer to «ROCKER ARM, VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the hydraulic lifters are to be reused, identify their positions so that they can be reassembled into their original locations.
4. Remove the hydraulic lifter(s) (1).

INSTALLATION

Note. The LH cylinder head hydraulic lifters are shown in illustration, the RH cylinder head hydraulic lifters are similar. If the hydraulic lifters are being reused, reassemble them into their original locations.

1. Verify that the hydraulic lifters are at least partially full of oil. There should be little or no plunger travel when the hydraulic lifter is depressed.
2. Install the hydraulic lifter(s) (1). NOTE: If the rocker arms are being reused, reassemble them into their original locations.
3. Install the rocker arm(s). Refer to «ROCKER ARM, VALVE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Install the camshaft(s), phasers, cylinder head cover(s) and upper intake manifold. Refer to «CAMSHAFT, ENGINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Scheme 159

The rocker arms are steel stampings with an integral roller bearing. The rocker arms incorporate a 0.5 mm oil hole in the lash adjuster socket for roller and camshaft lubrication.

Scheme 160

Note. The LH cylinder head rocker arms are shown in illustration, the RH cylinder head rocker arms are similar.

1. Disconnect and isolate the negative battery cable.
2. Remove the camshaft(s). Refer to «CAMSHAFT, ENGINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the rocker arms are to be reused, identify their positions so that they can be reassembled into their original locations.
3. Remove the rocker arm(s) (1).

Scheme 161

Inspect the cam follower assembly for wear or damage. see scheme 325 Replace as necessary.

Note. The LH cylinder head rocker arms are shown in illustration, the RH cylinder head rocker arms are similar. If the rocker arms are being reused, reassemble them into their original locations.

1. Lubricate the rocker arms with clean engine oil before installation.
2. Install the rocker arm(s) (1).
3. Install the camshaft(s), phasers, cylinder head cover(s) and upper intake manifold. Refer to «CAMSHAFT, ENGINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Scheme 162

The valve stem oil seals (1) are made of elastomer over-molded steel in a non-integrated type guide mounted configuration. The seal is not held in place by the valve spring (2). The valve stem seals are not reusable if removed from the valve guides (3), they must be replaced. Always coat the valve seals with clean engine oil before installing the valves.

Scheme 163

Note. If the springs are to be reused, identify their positions so that they can be reassembled into their original locations. Number 5 cylinder exhaust valve spring shown in illustration, all other valve springs similar.

Scheme 164

Scheme 165

1. Remove the valve spring(s) (2). Refer to «SPRING(S), VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Number 5 cylinder exhaust valve guide seal shown in illustration, all other valve guide seals similar.
2. Remove the valve guide seal (1) using a valve seal tool (2). Discard the removed seal. NOTE: Number 5 cylinder exhaust valve spring seat shown in illustration, all other valve spring seats similar.
3. If required, remove the valve spring seat (1).
4. If required, remove the valve(s). Refer to «VALVES, INTAKE AND EXHAUST, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 166

1. If removed, install the valve(s). Refer to «VALVES, INTAKE AND EXHAUST, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Reassemble the valves into their original locations. If the valves or valve seats have been refinished, verify that the valve stem tip height is within specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) . Number 5 cylinder exhaust valve shown in illustration, all other valves similar.
2. If removed, install the spring seat (1) over the valve guide.
3. Apply engine oil to the lip of the valve guide seal (3). Install the valve guide seal (3) over the valve stem. Using an appropriate driver (1), push the seal firmly and squarely over the valve guide. Do Not Force the seal against the top of guide. NOTE: Ensure that the garter spring (2) is intact around the top of the valve guide seal (3). Number 5 cylinder exhaust valve guide seal shown in illustration, all other valves similar. NOTE: If the valve springs are being reused, reassemble them into their original locations. Number 5 cylinder exhaust valve spring shown in illustration, all other valves similar.
4. Install the valve spring(s) (2). Refer to «SPRING(S), VALVE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 167

The valve springs are a beehive design and made from high strength chrome silicon steel. The springs are common for intake and exhaust applications. Valve guide seals are rubber overmolded on a steel support cylinder with a garter spring at the seal lip. The seals are not integrated with the valve spring seat. The valve spring seat is a flat steel washer. The steel valve spring retainers are designed for use with beehive springs and the valve spring retainer locks are a three bead Butt type design.

IN VEHICLE

Scheme 168

Scheme 169

Scheme 170

Scheme 171

1. Disconnect and isolate the negative battery cable.
2. Remove the cowl extension silencer. Refer to «Body/Exterior/SILENCER, Cowl Extension - Removal»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
3. If removing the LH exhaust valve springs, recover the refrigerant from the refrigerant system and remove the A/C suction and liquid line assembly (1). Refer to «LINE, A/C SUCTION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . NOTE: Power steering pump not shown in illustration.
4. If removing the LH exhaust valve springs, remove the nut (1) and bolt (4) from the support brackets of the heater core return tube (3) and reposition the tube.
5. If removing the RH valve springs, remove the transmission fluid level indicator tube (2). Refer to «SEAL, FILL TUBE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information) , «SEAL, OUTPUT SHAFT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information) and «SEAL, TORQUE CONVERTER HUB, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information) .
6. Remove both cylinder head covers. Refer to «COVER(S), CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: The LH cylinder head rocker arms are shown in illustration, the RH cylinder head rocker arms are similar. NOTE: Only remove the camshafts from one head at a time. The opposite head must remain assembled in order to lock the crankshaft against rotation.
7. Remove the camshaft(s). Refer to «CAMSHAFT, ENGINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the rocker arms are to be reused, identify their positions so that they can be reassembled into their original locations.
8. Remove the rocker arm(s) (1). Refer to «ROCKER ARM, VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: RH camshaft phaser lock shown in illustration, LH camshaft phaser lock similar. CAUTION: Air pressure applied to the cylinder holds the valves in place. This air pressure also has a tendency to force the piston down and rotate the crankshaft. Do not allow the crankshaft to rotate. Crankshaft rotation may damage the timing chain or front timing cover and affect camshaft timing.
9. If removing the LH camshafts, install the RH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser) (5) to lock the crankshaft against rotation. If removing the RH camshafts, install the LH Camshaft Phaser Lock (special tool #10202, Locks, Camshaft/Phaser) to lock the crankshaft against rotation. NOTE: Number 4 cylinder intake valve spring compression shown in illustration, all other valves similar.
10. Remove the spark plug. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
11. Install Valve Spring Compressor (special tool #MD998772A, Compressor, Valve Spring) (2) onto the cylinder head.
12. Install a spark plug adapter attached to a regulated shop air supply (1). Pressurize the cylinder being serviced to 620.5 - 689 kPa (90 - 100 psi) to hold the valves in place. CAUTION: Air pressure must be maintained as long as the valve springs are removed to prevent the valves from dropping into the cylinders.
13. Using Valve Spring Compressor Adapter (special tool #10224, Adapter, Valve Spring) (3), compress valve spring (4) and remove valve retaining locks (5). NOTE: If the springs are to be reused, identify their positions so that they can be reassembled into their original locations. Number 5 cylinder exhaust valve spring shown in illustration, all other valve springs similar.
14. Release the valve spring compression and remove the valve spring retainer (1) and valve spring (2).
15. If required, remove the valve guide seal and spring seat. Refer to «SEAL(S), VALVE GUIDE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 172

Scheme 173

1. Remove the cylinder head(s). Refer to «CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. Position the Valve Spring Compressor Adapter (special tool #10224, Adapter, Valve Spring) (2) in the Valve Spring Compressor (special tool #C-3422-D, Compressor, Valve Spring) (1). NOTE: Number 3 cylinder intake valve spring compression shown in illustration, all other valves similar.
3. Compress the valve spring (3) and remove the valve retaining locks (4). NOTE: If the springs are to be reused, identify their positions so that they can be reassembled into their original locations. Number 5 cylinder exhaust valve spring shown in illustration, all other valves similar.
4. Release the valve spring compression and remove the valve spring retainer (1) and valve spring (2).
5. If required, remove the valve(s). Refer to «VALVES, INTAKE AND EXHAUST, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
6. If required, remove the valve guide seal and spring seat. Refer to «SEAL(S), VALVE GUIDE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 174

When valves have been removed for inspection, reconditioning or replacement, valve springs should be checked against specifications for free-length, spring force and spring installed height. Refer to Engine - Specifications .

Spring force can be measured with a test fixture (2). Follow the tool manufactures instructions. Replace any springs that do not meet specifications.

Scheme 175

Installed height of the valve spring must be checked with the valve assembled into the cylinder head. Refer to SPRING(S), VALVE, INSTALLATION .

If the valves or valve seats have been refinished and the installed valve spring height (4) is greater than 40.0 mm (1.575 in.), install an additional spring seat (8) in the head counterbore under the original valve spring seat (8) to bring the spring height back within specification. Make sure the measurement is taken from the top of spring seat (6) to the bottom surface of spring retainer (1).

Scheme 176

1. If removed, install the spring seat (3) and valve guide seal (1) over the valve guide. Refer to «SEAL(S), VALVE GUIDE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Ensure that the garter spring (2) is intact around the top of the valve guide seal (1). Number 5 cylinder exhaust valve guide seal shown in illustration, all other valves similar. NOTE: If the valve springs are being reused, reassemble them into their original locations. Number 5 cylinder exhaust valve spring shown in illustration, all other valves similar.
2. Install the valve spring (2) and valve spring retainer (1). NOTE: Number 4 cylinder intake valve spring compression shown in illustration, all other valves similar.
3. Using Valve Spring Compressor Adapter (special tool #10224, Adapter, Valve Spring) (3) with Valve Spring Compressor (special tool #MD998772A, Compressor, Valve Spring) (2), compress the valve spring (4) only enough to install the valve retaining locks (5).
4. Relieve the air pressure and remove the spark plug adapter.
5. Install the spark plug and tighten to 17.5 N.m (13 ft. lbs.). Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) . NOTE: The LH cylinder head rocker arms are shown in illustration, the RH cylinder head rocker arms are similar. If the rocker arms are being reused, reassemble them into their original locations.
6. Install the rocker arm(s) (1). Refer to «ROCKER ARM, VALVE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
7. Install the camshaft(s), phasers, cylinder head cover(s) and upper intake manifold. Refer to «CAMSHAFT, ENGINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
8. If removed, install the transmission fluid level indicator tube (2). Refer to «SEAL, FILL TUBE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information) , «SEAL, OUTPUT SHAFT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information) and «SEAL, TORQUE CONVERTER HUB, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information) . NOTE: Power steering pump not shown in illustration.
9. If removed, install the nut (1) and bolt (4) to the support brackets of the heater core return tube (3). Tighten the fasteners to 12 N.m (106 in. lbs.).
10. If removed, install the A/C suction and liquid line assembly (1). Refer to «LINE, A/C SUCTION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) .
11. Install the cowl extension silencer. Refer to «Body/Exterior/SILENCER, Cowl Extension - Installation»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
12. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

OFF VEHICLE

1. If removed, install the valve(s). Refer to «VALVES, INTAKE AND EXHAUST, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Reassemble the valves into their original locations. If the valves or valve seats have been refinished, verify that the valve stem tip height is within specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) . Number 5 cylinder exhaust valve shown in illustration, all other valves similar.
2. If removed, install the spring seat (3) and valve guide seal (1) over the valve guide. Refer to «SEAL(S), VALVE GUIDE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Ensure that the garter spring (2) is intact around the top of the valve guide seal (1). Number 5 cylinder exhaust valve guide seal shown in illustration, all other valves similar. NOTE: If the valve springs are being reused, reassemble them into their original locations. Number 5 cylinder exhaust valve spring shown in illustration, all other valves similar.
3. Install the valve spring (2) and valve spring retainer (1). NOTE: Number 3 cylinder intake valve spring compression shown in illustration, all other valves similar.
4. Compress valve springs (3) with the Valve Spring Compressor Adapter (special tool #10224, Adapter, Valve Spring) (2) mounted in the Valve Spring Compressor (special tool #C-3422-D, Compressor, Valve Spring) (1). Install the retaining locks (4) and release the valve spring compression.
5. If the valves or valve seats have been refinished, check the installed height of the valve springs (4). If the installed valve spring height (4) is greater than 40.0 mm (1.575 in.), install an additional spring seat (8) in the head counterbore under the original valve spring seat (8) to bring the spring height back within specification. Make sure the measurement is taken from the top of spring seat (6) to the bottom surface of spring retainer (1).
6. Install the cylinder head(s). Refer to «CYLINDER HEAD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

REMOVAL

Scheme 177

Scheme 178

1. Disconnect and isolate the negative battery cable.
2. Remove the ignition coils. Refer to «COIL, IGNITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
3. Using compressed air, blow out any dirt or contaminates from around the top of the spark plugs.
4. Remove the cylinder head cover(s). Refer to «COVER(S), CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Install the top half of Spark Plug Tube Installer (special tool #10255, Installer, Spark Plug Tube) (1) into the spark plug tube to be removed (2).
6. Using suitable locking pliers (1), remove the spark plug tube (2) from the cylinder head and discard the tube.
7. Clean the area around the spark plug tube mounting with Mopar® Parts Cleaner or equivalent.

Scheme 179

Scheme 180

Scheme 181

1. Remove the spark plug. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
2. Install the lower half of Spark Plug Tube Installer (special tool #10255, Installer, Spark Plug Tube) (1) into the cylinder head and tighten to 17.5 N.m (13 ft. lbs.).
3. Apply Mopar® Stud and Bearing Mount to the new spark plug tube approximately 3 mm (0.118 in.) from the end of the tube, in a 2 mm (0.078 in.) wide bead (1).
4. Position the spark plug tube (3) on the top half of Spark Plug Tube Installer (special tool #10255, Installer, Spark Plug Tube) (2) and assemble the tool on the cylinder head. Make sure there are two thrust washers (4) installed. CAUTION: Do not overtighten the bolt (1). Overtightening can damage the cylinder head spark plug threads.
5. Tighten the bolt (1) to draw the spark plug tube into position. When the top half of the tool contacts the bottom half of the tool, the tube is installed. NOTE: LH cylinder head cover shown in illustration, RH cylinder head cover similar. CAUTION: Spark plug torque is critical and must not exceed the specified value. Overtightening stretches the spark plug shell reducing its heat transfer capability resulting in possible catastrophic engine failure.
6. Install the spark plug and tighten to 17.5 N.m (13 ft. lbs.). Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
7. If required, install a new spark plug tube seal (2). Refer to «COVER(S), CYLINDER HEAD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
8. Install the cylinder head cover(s). Refer to «COVER(S), CYLINDER HEAD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Scheme 182

The intake valve (6) is made from a one piece forged heat resistant (martensitic) steel. The exhaust valve (7) is a two piece construction with a forged (austenitic) head welded to the (martensitic) stem. Both valves have a nitrided surface treatment to prevent scuffing except at the tip and lock grooves. The four valves per cylinder are actuated by roller rocker arms, which pivot on stationary lash adjusters. All valves use three bead lock keepers (1) to retain springs (3) and to promote valve rotation.

Scheme 183

The intake and exhaust valves have a 45.25 ± 0.25 degree face angle (1). The valve seats (2) have a 44.75 ± 0.25 degree face angle.

Scheme 184

Inspect the remaining margin (5) after the valves are refaced. Refer to Engine - Specifications .

VALVE SEATS

Note. When refacing the valve seats, it is important that the correct size valve guide pilot be used for the reseating stones. A true and complete surface must be obtained.

1. Measure the concentricity of the valve seat using a dial indicator. Total runout should not exceed 0.050 mm (0.002 inch.) total indicator reading.
2. Inspect the valve seat (3) with Prussian blue to determine where the valve contacts the seat. To do this, coat the valve seat (3) LIGHTLY with Prussian blue then set the valve in place. Rotate the valve with light pressure. If the blue is transferred to the center of the valve face (4), contact is satisfactory. If the blue is transferred to the top edge of the valve face, then lower the valve seat with a 15 degree stone. If the blue is transferred to the bottom edge of the valve face, then raise the valve seat with a 65 degree stone. NOTE: Valve seats which are worn or burned can be reworked, provided that the correct angle and seat width are maintained. Otherwise the cylinder head must be replaced.
3. When the seat is properly positioned the width of the intake seat should be 1.0 - 1.2 mm (0.04 - 0.05 in.) and the exhaust seats should be 1.41 - 1.61 mm (0.055 - 0.063 in.).

VALVE AND SPRING INSTALLED HEIGHT

1. Coat the valve stems (2) with clean engine oil and install the valves into the cylinder head. NOTE: If the valves are being reused, reassemble them into their original locations.
2. If the valves or valve seats have been refinished, check the valve tip height (5). If the valve tip height (5) exceeds the specification, grind the valve tip until it is within specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) . Make sure the measurement is taken from the cylinder head surface (7) to the top of the valve stem (2).
3. If removed, install the spring seat (3) and valve guide seal (1) over the valve guide. Refer to «SEAL(S), VALVE GUIDE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Ensure that the garter spring (2) is intact around the top of the valve guide seal (1). Number 5 cylinder exhaust valve guide seal shown in illustration, all other valves similar. NOTE: If the valve springs are being reused, reassemble them into their original locations. Number 5 cylinder exhaust valve spring shown in illustration, all other valves similar.
4. Install the valve spring (2) and valve spring retainer (1). NOTE: Number 3 cylinder intake valve spring compression shown in illustration, all other valves similar.
5. Compress valve springs (3) with the Valve Spring Compressor Adapter (special tool #10224, Adapter, Valve Spring) (2) mounted in the Valve Spring Compressor (special tool #C-3422-D, Compressor, Valve Spring) (1). Install the retaining locks (4) and release the valve spring compression.
6. If the valves or valve seats have been refinished, check the installed height of the valve springs (4). If the installed valve spring height (4) is greater than 40.0 mm (1.575 in.), install a second spring seat (8) in the head counterbore under the valve spring seat (8) to bring the spring height back within specification. Make sure the measurement is taken from the top of spring seat (6) to the bottom surface of spring retainer (1).

1. Remove the cylinder head(s). Refer to «CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: If the springs are to be reused, identify their positions so that they can be reassembled into their original locations. Number 5 cylinder exhaust valve spring shown in illustration, all other valve springs similar.
2. Remove the valve spring(s) (2). Refer to «SPRING(S), VALVE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . CAUTION: Before removing the valves, remove any burrs from the valve stem retainer lock grooves (2) and stem tip (1) to prevent damage to the valve guides.
3. Remove the valve(s) (3). Identify each valve to ensure installation in the original location.
4. If required, remove the valve guide seal (1) and spring seat (3). Refer to «SEAL(S), VALVE GUIDE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

VALVES

1. Clean and inspect the valves thoroughly. Replace burned, warped and cracked valves.
2. Inspect the retainer lock grooves for wear or damage (2).
3. Inspect the valve face (4) for wear and pitting.
4. Measure the valve stems (3) and margins (5) for wear. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .

Scheme 185

1. Remove carbon and varnish deposits from inside of the valve guides with a reliable guide cleaner.
2. Measure valve stem-to-guide clearance as follows
3. Install the valve (2) into the cylinder head so that it is 15 mm (0.590 inch.) off of the valve seat. A small piece of hose may be used to hold the valve in place.
4. Attach the Dial Indicator Set (special tool #C-3339A, Set, Dial Indicator) (1) to the cylinder head and set it at a right angle to the valve stem being measured.
5. Move the valve to and from the indicator. Compare this reading to the specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .

Note. If stem-to-guide clearance exceeds specifications, you must measure the valve stem. If the valve stem is within specification or if the valve guide is loose in the cylinder head, replace the cylinder head.

1. Coat the valve stems (2) with clean engine oil and install the valves into the cylinder head. NOTE: If the valves are being reused, reassemble them into their original locations.
2. If the valves or valve seats have been refinished, check the valve tip height (5). If the valve tip height (5) exceeds the specification, grind the valve tip until it is within specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) . Make sure the measurement is taken from the cylinder head surface (7) to the top of the valve stem (2).
3. If removed, install the spring seat (3) and valve guide seal (1) over the valve guide. Refer to «SEAL(S), VALVE GUIDE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Ensure that the garter spring (2) is intact around the top of the valve guide seal (1). Number 5 cylinder exhaust valve guide seal shown in illustration, all other valves similar.
4. Install the valve spring(s) (2). Refer to «SPRING(S), VALVE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Reassemble the valves springs into their original locations. If the valves or valve seats have been refinished, verify that the valve spring installed height is within specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) . Number 5 cylinder exhaust valve spring shown in illustration, all other valves springs similar.
5. Install the cylinder head(s). Refer to «CYLINDER HEAD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 186

The cylinder block is a 60 degree high-pressure die cast aluminum design with cast steel cylinder liners. The leading side of the block is on the right side and houses cylinders 1, 3 and 5. The cylinder block is an open deck design with cut slots between each cylinder. Two knock sensors are located in the block valley. The cylinder block has three sets of piston cooling jets which are attached to the main oil gallery. The four powdered metal main bearing caps are a cross-bolted design and have directional arrows molded into the caps. The number 2 main bearing is the location for the two piece upper half thrust bearings. The thrust bearings are installed with the oil groves facing outward. The main bearing caps are a 6-bolt design and cross-bolted for improved lower end strength. There are three oil drain back drillings located on each of the cylinder banks.

Scheme 187

Note. Typical crankshaft journal shown in illustration.

Engine crankshaft and connecting rod bearing clearances can be determined by the use of Plastigage or equivalent. The following is the recommended procedure for the use of Plastigage

Scheme 188

Scheme 189

1. Remove the oil film from surface to be checked. Plastigage is soluble in oil.
2. Place a piece of Plastigage (1) across the entire width of the journal (In addition, suspected areas can be checked by placing the Plastigage in the suspected area). Plastigage must not crumble in use. If brittle, obtain fresh stock.
3. Torque the bearing cap bolts of the bearing being checked to the proper specifications. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) . NOTE: DO NOT rotate the crankshaft. Plastigage will smear, causing inaccurate results. NOTE: Typical connecting rod cap shown in illustration.
4. Remove the bearing cap and compare the width of the flattened Plastigage (2) with the scale provided on the package (1). Locate the band closest to the same width. This band shows the amount of clearance. Differences in readings between the ends indicate the amount of taper present or the possibility of foreign material trapped under the bearing insert.
5. Record all readings taken. Compare clearance measurements to engine specifications. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) . NOTE: Typical connecting rod journal shown in illustration. NOTE: Plastigage is available in a variety of clearance ranges. Use the most appropriate range for the specifications you are checking. Plastigage generally is accompanied by two scales. One scale is in inches, the other is a metric scale.
6. Install the proper bearings to achieve the specified bearing clearances.
7. Repeat the Plastigage measurement to verify your bearing selection prior to final assembly.

Scheme 190

Before honing, stuff plenty of clean shop towels under the bores and over the crankshaft to keep abrasive materials from entering the crankshaft area.

1. Used carefully, a cylinder bore sizing hone equipped with 220 grit stones, is the best tool for this job. In addition to deglazing, it will reduce taper and out-of-round, as well as removing light scuffing, scoring and scratches. Usually, a few strokes will clean up a bore and maintain the required limits. CAUTION: DO NOT use rigid type hones to remove cylinder wall glaze.
2. Deglazing of the cylinder walls may be done if the cylinder bore is straight and round. Use of a cylinder surfacing hone equipped with 280 grit stones, about 20-60 strokes, depending on the bore condition, will be sufficient to provide a satisfactory surface. Use a light honing oil, available from major oil distributors. CAUTION: DO NOT use engine or transmission oil, mineral spirits, or kerosene.
3. Honing should be done by moving the hone up and down fast enough to get a crosshatch pattern. The hone marks should INTERSECT at 50° to 60° for proper seating of rings.
4. A controlled hone motor speed between 200 and 300 RPM is necessary to obtain the proper crosshatch angle (1). The number of up and down strokes per minute can be regulated to get the desired 50° to 60° angle (2). Faster up and down strokes increase the crosshatch angle.
5. After honing, it is necessary that the block be cleaned to remove all traces of abrasive. Use a brush to wash parts with a solution of hot water and detergent. Dry parts thoroughly. Use a clean, white, lint-free cloth to check that the bore is clean. Oil the bores after cleaning to prevent rusting.

Scheme 191

Scheme 192

1. Wipe the main bearing inserts (1 and 2) clean.
2. Inspect the inserts for abnormal wear patterns, scoring, grooving, fatigue, pitting and for metal or other foreign material imbedded in the lining.
3. Inspect the back of the inserts for fractures, scrapes, or irregular wear patterns.
4. Inspect the insert locking tabs for damage.
5. Inspect the crankshaft thrust washers for scoring, scratches, wear or blueing.
6. Replace any bearing that shows abnormal wear. Refer to «Engine/Engine Block/BEARING(S), Crankshaft - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
7. Inspect the main bearing bores for signs of scoring, nicks and burrs.
8. If the cylinder block main bearing bores show damage the engine block must be replaced.
9. Use Cylinder Indicator (special tool #C-119, Cylinder Indicator) (2) to correctly measure the inside diameter of the cylinder bore (3). A cylinder bore gauge capable of reading in 0.003 mm (0.0001 in.) INCREMENTS is required. If a bore gauge is not available, do not use an inside micrometer.
10. Measure the inside diameter of the cylinder bore at three levels below the top of the bore (4). Start at the top of the bore, perpendicular (across or at 90 degrees) to the axis of the crankshaft at point A (1).
11. Repeat the measurement near the middle of the bore, then repeat the measurement near the bottom of the bore.
12. Determine taper by subtracting the smaller diameter from the larger diameter.
13. Rotate measuring device 90° to point B (1) and repeat the three measurements. Verify that the maximum taper is within specifications. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .
14. Determine out-of-roundness by comparing the difference between A and B at each of the three levels. Verify that the maximum out of round is within specifications. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .
15. If cylinder bore taper and out-of-roundness are within specification, the cylinder bore can be honed. Refer to «Engine/Engine Block - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . If the cylinder bore taper or out-of-round condition exceeds the maximum limits, the cylinder block must be replaced.

Note. A slight amount of taper always exists in the cylinder bore after the engine has been in use for a period of time.

Scheme 193

The connecting rod bearings are "select fit" to achieve proper oil clearance. Connecting rod bearing journal diameter grade markings (2) are stamped into the front crankshaft counterweight. These marks are read from left to right, corresponding with journal number 1, 2, 3, 4, 5, 6. Select the bearing size that corresponds to the crankshaft markings for each rod bearing journal.

Connecting rod bearing journal diameter grade markings correspond to specific journal diameters. The chart below identifies the three crankshaft grade markings and their associated journal diameters.

Scheme 194

Note. Install the rod bearings in pairs. Do not mix sizes or use a new bearing half with an old bearing half.

The connecting rod bearing shells (1) are marked with the bearing size (2) on the bearing lining surface. The bearings are available in three different sizes in order to achieve the desired oil clearance.

Rod bearing shells are available in three sizes. The chart below identifies the three bearing sizes.

Bearing oil clearance can also be determined by using Plastigage or equivalent. Refer to Engine/Engine Block - Standard Procedure .

CONNECTING ROD BEARING REPLACEMENT

The connecting rod bearings (1) are serviced in-vehicle. They must be replaced one-at-a-time in order to prevent the pistons from contacting the valves. The connecting rod bearings are "select fit" to achieve proper oil clearances. Refer to BEARING(S), CONNECTING ROD, STANDARD PROCEDURE .

Scheme 195

Scheme 196

Scheme 197

Scheme 198

1. Disconnect and isolate the negative battery cable.
2. Remove the spark plugs. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
3. Remove the oil pan, oil pump pick-up and engine oil pump. Refer to «PUMP, ENGINE OIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Remove the eight main bearing cap bolts from the windage tray in the sequence shown in illustration and remove the windage tray (1). CAUTION: DO NOT use a number stamp or a punch to mark connecting rods or caps, as damage to connecting rods could occur NOTE: Connecting rods and bearing caps are not interchangeable and should be marked before removing to ensure correct reassembly.
5. Mark connecting rod and bearing cap positions (1) using a permanent ink marker or scribe tool. NOTE: Typical V6 engine configuration shown in illustration. CAUTION: Replace only one connecting rod bearing at a time while all other connecting rod bearing caps remain properly tightened. If all connecting rod bearing caps are removed, crankshaft rotation will result in valve and/or piston damage. CAUTION: Care must be taken not to damage the fractured rod and cap joint face surfaces, as engine damage may occur.
6. Remove the connecting rod cap bolts (5) and the connecting rod cap (4). Discard the cap bolts.
7. Remove the plastic guide plates (3) from the Guide Pins (special tool #8189, Guide Pins) (7) and install the Guide Pins to the connecting rod being removed. CAUTION: Care must be taken not to nick crankshaft journals, as engine damage may occur.
8. Rotate the crankshaft away from the connecting rod and remove the bearing shell.
9. If required, select and fit new bearings to the connecting rod. Refer to «BEARING(S), CONNECTING ROD, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
10. Install the bearing shell (8) on the connecting rod with the tang inserted into the machined groove in the rod. Lubricate the bearing surface with clean engine oil.
11. Rotate the crankshaft while guiding the connecting rod into position over the rod journal. CAUTION: The connecting rod bolts must not be reused. Always replace the connecting rod bolts whenever they are loosened or removed.
12. Install the bearing shell (6) on the connecting rod cap (4) with the tang inserted into the machined groove in the cap. Lubricate the bearing surface with clean engine oil. NOTE: Do not lubricate the threads of the connecting rod cap bolts (5).
13. Install the connecting rod cap and bearing with the tang on the same side as the rod. Tighten the NEW connecting rod cap bolts (5) to 20 N.m (15 ft. lbs.) plus 90°.
14. If required, check the connecting rod side clearance. Refer to «Engine/Engine Block/ROD, Piston and Connecting - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
15. Repeat the previous steps for each connecting rod bearing being replaced. CAUTION: The main bearing cap bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced.
16. Check the main bearing cap bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced.
17. Install the windage tray with eight main bearing cap bolts. Tighten the bolts in the sequence shown in illustration to 21 N.m (16 ft. lbs.) plus 90°.
18. Install the engine oil pump, oil pump pick-up and oil pan. Refer to «PUMP, ENGINE OIL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
19. Install the spark plugs and ignition coils. Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
20. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
21. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
22. Operate the engine until it reaches normal operating temperature.

MAIN BEARING FITTING

The upper and lower main bearings are "select fit" to achieve proper oil clearances. Crankshaft main bearing journal diameter grade markings (1) are stamped into the front crankshaft counterweight. These marks are read from left to right, corresponding with journal number 1, 2, 3, 4.

Crankshaft main bearing journal diameter grade markings correspond to specific journal diameters. The chart below identifies the five crankshaft grade markings and their associated journal diameters.

Scheme 199

Engine block main bearing journal diameter grade markings (2) are stamped into the left side of the engine block. These marks are read from left to right, corresponding with journal number 1, 2, 3, 4.

Engine block main bearing journal grade markings correspond to specific journal diameters. The chart below identifies the five engine block grade markings and their associated journal diameters.

For upper and lower main bearing selection, obtain the grade identification marks from the crankshaft and engine block. Main bearings are available in five sizes. Upper and lower sizes can be mixed on a journal in order to achieve the desired oil clearance. The chart below identifies the five sizes available and how they should be selected based on crankshaft and engine block grade markings.

The upper main bearing shell (2) and lower main bearing shell (1) are marked with the bearing size (3) on the bearing lining surface. The upper and lower bearings are available in five different sizes and can be mixed on a journal in order to achieve the proper oil clearance.

Upper and lower main bearing shells are available in five sizes. The chart below identifies the five bearing sizes.

Note. Crankshaft thrust washers are not selectable and are only available in a single thickness.

Bearing oil clearance can also be determined by using Plastigage or equivalent. Refer to Engine/Engine Block - Standard Procedure .

Scheme 200

The main bearings are serviced in-vehicle. They must be replaced one-at-a-time in order to properly support the crankshaft. The upper and lower main bearing shells are NOT interchangeable. The upper and lower main bearings are "select fit" to achieve proper oil clearances. Refer to Engine/Engine Block/BEARING(S), Crankshaft - Standard Procedure .

Note. Late production vehicles are equipped with Electro-Hydraulic Power Steering (EHPS) and do not have an engine mounted power steering pump.

Scheme 201

Scheme 202

Scheme 203

Scheme 204

1. Disconnect and isolate the negative battery cable.
2. Remove the spark plugs. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
3. If equipped with an engine mounted power steering pump, remove the serpentine drive belt. Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) . NOTE: Only two power steering pump mounting bolts are shown in illustration. Another bolt is on the lower end of the pump near the pulley.
4. Remove the three power steering pump mounting bolts (1) and reposition the power steering pump, if equipped.
5. Remove the oil pan, oil pump pick-up and engine oil pump. Refer to «PUMP, ENGINE OIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
6. Remove the eight main bearing cap bolts from the windage tray in the sequence shown in illustration and remove the windage tray (1). NOTE: Typical V6 engine configuration shown in illustration.
7. Remove the eight main bearing tie bolts in the sequence shown in illustration. CAUTION: DO NOT use a number stamp or a punch to mark main bearing caps, as damage to main bearings could occur. NOTE: Main bearing caps are not interchangeable and are marked to insure correct assembly.
8. Mark the main bearing cap positions using a permanent ink marker or a scribe tool. NOTE: Typical V6 engine configuration shown in illustration. CAUTION: Replace only one main bearing at a time while all other main bearing caps remain properly tightened. If all main bearing caps are removed, the weight of the unsupported crankshaft will damage the crankshaft oil seals. NOTE: Replace the main bearings in the following order; 2, 3, 1, 4.
9. Remove the two cap bolts (2) and remove the main bearing cap (1).
10. When removing the No. 2 bearing cap, also remove the thrust washers (5).
11. Slide the upper main bearing half (6) out from between the crankshaft and the engine block.
12. If required, select fit new main bearings to the engine block. Refer to «Engine/Engine Block/BEARING(S), Crankshaft - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
13. Lubricate the upper main bearing half (6) with clean engine oil and slide the bearing into position. NOTE: Typical V6 engine configuration shown in illustration.
14. When installing thrust washers (1) at the No. 2 main bearing location, use the following procedure: Move the crankshaft forward to the limit of travel. Lubricate and install the front thrust washer (1) by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface. Move the crankshaft rearward to the limit of travel. Lubricate and install the rear thrust washer by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface. CAUTION: The main bearing cap bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced.
15. Check the main bearing cap bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced. NOTE: Typical V6 engine configuration shown in illustration.
16. Lubricate and install the lower bearing half (3) onto the main cap (1).
17. Install the main bearing cap (1) with two inner main bearing cap bolts (2) tightened to 20 N.m (15 ft. lbs.) plus 90°.
18. Repeat the previous steps for main bearings 3, 1 and 4.
19. Measure crankshaft end play. Refer to «Engine/Engine Block/CRANKSHAFT - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
20. Install the windage tray with eight main bearing cap bolts. Tighten the bolts in the sequence shown in illustration to 21 N.m (16 ft. lbs.) plus 90°. NOTE: Typical V6 engine configuration shown in illustration.
21. Install the eight main bearing tie bolts. Tighten the bolts in the sequence shown in illustration to 28 N.m (21 ft. lbs.).
22. Install the engine oil pump, oil pump pick-up and oil pan. Refer to «PUMP, ENGINE OIL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Only two power steering pump mounting bolts are shown in illustration. Another bolt is on the lower end of the pump near the pulley.
23. If removed, position the power steering pump (4) to the engine block. Install the three pump mounting bolts (1) and tighten to 25 N.m (18 ft. lbs.).
24. If removed, install the accessory drive belt. Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) .
25. Install the spark plugs and ignition coils. Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
26. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
27. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
28. Operate the engine until it reaches normal operating temperature.

Scheme 205

The crankshaft is a cast design and is constructed using ductile iron. The crankshaft is a three throw split pin design with counterweights for balancing purposes. The main journals are crossed drilled for rod bearing lubrication. The crankshaft is supported by four select fit main bearings with number 2 serving as the thrust washer location. The rear counterweight has provisions for crankshaft position sensor target wheel mounting. Both the front and rear seals are a single piece design and are mounted to the timing cover and cylinder block.

Scheme 206

Note. Typical V6 engine shown in illustration.

1. Mount Dial Indicator Set (special tool #C-3339A, Set, Dial Indicator) to a stationary point at the front of the engine. Locate the probe perpendicular against the nose of the crankshaft.
2. Move the crankshaft all the way to the rear of its travel.
3. Zero the dial indicator.
4. Move the crankshaft forward to the limit of travel and read the dial indicator. Compare the measured end play to the specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .

Note. Crankshaft thrust washers are not selectable and are only available in a single thickness.

Note. To remove the crankshaft from the engine, the engine must be removed from the vehicle.

Scheme 207

Scheme 208

1. Remove the engine. Refer to «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__removal) .
2. Remove the cylinder head covers, spark plugs, upper oil pan, engine timing cover, timing chain and sprockets. Refer to «CHAIN AND SPROCKETS, TIMING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Remove the flexplate and the rear crankshaft oil seal. Refer to «SEAL, CRANKSHAFT OIL, REAR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Remove the oil pump pick-up and engine oil pump. Refer to «PUMP, ENGINE OIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Remove the eight main bearing cap bolts from the windage tray in the sequence shown in illustration and remove the windage tray (1). CAUTION: DO NOT use a number stamp or a punch to mark connecting rods or caps, as damage to connecting rods could occur NOTE: Connecting rods and bearing caps are not interchangeable and should be marked before removing to ensure correct reassembly.
6. Mark connecting rod and bearing cap positions (1) using a permanent ink marker or scribe tool. NOTE: Typical V6 engine configuration shown in illustration. CAUTION: Care must be taken not to damage the fractured rod and cap joint face surfaces, as engine damage may occur.
7. Remove the connecting rod cap bolts (5) and the connecting rod caps (4). Discard the cap bolts. CAUTION: Care must be taken not to nick crankshaft journals, as engine damage may occur.
8. Remove the plastic guide plates (3) from the Guide Pins (special tool #8189, Guide Pins) (7) and install the Guide Pins to the connecting rod. CAUTION: Avoid contact with the piston oil cooler jet(s). Positioning of the oil cooler jet(s) is critical for proper engine operation.
9. Push the connecting rod and piston into the cylinder until the connecting rod is clear of the crankshaft journal. Remove the guide pins. Repeat this procedure at each cylinder until all of the connecting rods are clear of the crankshaft. NOTE: Typical V6 engine configuration shown in illustration. Remove the main bearing cross bolts in the sequence shown in illustration. CAUTION: DO NOT use a number stamp or a punch to mark main bearing caps, as damage to main bearings could occur. NOTE: Main bearing caps are not interchangeable and are marked to insure correct assembly.
10. Mark the main bearing cap positions using a permanent ink marker or a scribe tool.
11. Remove the eight main bearing cap bolts in the sequence shown in illustration and remove the main bearing caps. CAUTION: Do not rest the crankshaft on the target wheel (1). Damaged or bent target wheel teeth will destroy the target wheels ability to correctly relay crankshaft position to the crankshaft position sensor.
12. Remove the crankshaft from the engine block.
13. If required, remove the four bolts (2) and the target wheel (1). Discard the four bolts.

Scheme 209

Note. Typical crankshaft journal measurements shown in illustration.

1. Clean the oil off the bearing journals.
2. Determine the maximum diameter of the journals with a micrometer. Measure at two locations 90° apart at each end of the journals.
3. Compare the measured rod journal diameter to the crankshaft connecting rod bearing journal diameter grade marking chart Select the bearing size that corresponds to the crankshaft markings for each rod bearing journal that will provide the proper oil clearance. Refer to «BEARING(S), CONNECTING ROD, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Compare the measured main bearing journal diameter to the crankshaft main bearing journal diameter grade marking chart Obtain the main bearing journal grade identification marks from the engine block and select the upper and lower main bearing sizes that will provide the proper oil clearance. Refer to «Engine/Engine Block/BEARING(S), Crankshaft - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. For connecting rod journals, verify that the maximum taper and maximum out of round are within specifications. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .
6. For main bearing journals, verify that the maximum taper and maximum out of round are within specifications. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .

Scheme 210

1. If required, select and fit new crankshaft main bearings to the engine block. Refer to «Engine/Engine Block/BEARING(S), Crankshaft - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. If required, select and fit new bearings to the connecting rod. Refer to «BEARING(S), CONNECTING ROD, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. If removed, install the target wheel (1) to the crankshaft with four new bolts (2). Ensure the threaded holes in the crankshaft are free of residual thread lock adhesive. Tighten the bolts to 10 N.m (89 in. lbs.). NOTE: Typical V6 engine configuration shown in illustration.
4. If removed, lubricate and install the upper main bearing halves (6) into the engine block (7). CAUTION: When installing the crankshaft, use care not to damage bearing surfaces on the crankshaft.
5. Install the crankshaft (4) into the engine block (7). NOTE: Typical V6 engine configuration shown in illustration.
6. Installing thrust washers (1) at the No. 2 main bearing location, using the following procedure: Move the crankshaft forward to the limit of travel. Lubricate and install the front thrust washer (1) by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface. Move the crankshaft rearward to the limit of travel. Lubricate and install the rear thrust washer by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface. CAUTION: The main bearing cap bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced.
7. Check the main bearing cap bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced. NOTE: Typical V6 engine configuration shown in illustration.
8. If removed, lubricate and install the lower main bearing halves (3) onto the main caps (1).
9. Install the main bearing caps (1) with two inner main bearing cap bolts (2).
10. Tighten the inner main bearing cap bolts in the sequence shown in illustration to 20 N.m (15 ft. lbs.) plus 90°.
11. Measure crankshaft end play. Refer to «Engine/Engine Block/CRANKSHAFT - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Typical V6 engine configuration shown in illustration.
12. If removed, install the bearing shell (8) on the connecting rod with the tang inserted into the machined groove in the rod. Lubricate the bearing surface with clean engine oil. CAUTION: Care must be taken not to nick crankshaft journals, as engine damage may occur.
13. Remove the plastic guide plates (3) from the Guide Pins (special tool #8189, Guide Pins) (7) and install the Guide Pins to the connecting rod. CAUTION: Avoid contact with the piston oil cooler jet(s). Positioning of the oil cooler jet(s) is critical for proper engine operation.
14. Pull the connecting rod and piston toward the crankshaft until the connecting rod is seated on the crankshaft journal. Remove the guide pins. CAUTION: The connecting rod bolts must not be reused. Always replace the connecting rod bolts whenever they are loosened or removed.
15. If removed, install the bearing shell (6) on the connecting rod cap (4) with the tang inserted into the machined groove in the cap. Lubricate the bearing surface with clean engine oil. NOTE: Do not lubricate the threads of the connecting rod cap bolts (5).
16. Install the connecting rod cap and bearing with the tang on the same side as the rod. Tighten the NEW connecting rod cap bolts (5) to 20 N.m (15 ft. lbs.) plus 90°.
17. If required, check the connecting rod side clearance. Refer to «Engine/Engine Block/ROD, Piston and Connecting - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
18. Repeat the previous steps for the remaining connecting rods.
19. Install the windage tray (1) with eight main bearing cap bolts. Tighten the bolts in the sequence shown in illustration to 21 N.m (16 ft. lbs.) plus 90°. NOTE: Typical V6 engine configuration shown in illustration.
20. Install the eight main bearing tie bolts. Tighten the bolts in the sequence shown in illustration to 28 N.m (21 ft. lbs.).
21. Install the engine oil pump and oil pump pick-up. Refer to «PUMP, ENGINE OIL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
22. Install the rear crankshaft oil seal and flexplate. Refer to «SEAL, CRANKSHAFT OIL, REAR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
23. Install the timing chain and sprockets, engine timing cover, oil pans, spark plugs and cylinder head covers. Refer to «CHAIN AND SPROCKETS, TIMING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
24. Install the engine. Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__installation) .
25. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
26. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
27. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
28. Operate the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

Note. The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.

Scheme 211

1. Remove the accessory drive belt. Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) . NOTE: A force greater than 350 N.m (260 ft. lbs.) may be required to remove the crankshaft vibration damper bolt.
2. Hold the crankshaft vibration damper (1) with Vibration Damper Holder (special tool #10198, Holder, Vibration Damper) (2) and remove the crankshaft vibration damper bolt.
3. Pull the crankshaft vibration damper (1) off of the crankshaft.

Scheme 212

Scheme 213

1. Apply a light coating of engine oil to the front crankshaft seal surface (1).
2. Align the crankshaft vibration damper (1) to the flywheel key on the crankshaft and install the damper. Seat the damper on the crankshaft sprocket.
3. Install and hand tighten the crankshaft vibration damper bolt (2).
4. Hold the crankshaft vibration damper (1) with Vibration Damper Holder (special tool #10198, Holder, Vibration Damper) (2) and tighten the crankshaft vibration damper bolt to 40 N.m + 105° (30 ft. lbs. + 105°).
5. Install the accessory drive belt. Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) .

Scheme 214

1. Remove the transmission. Refer to «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information__removal) .
2. Remove the bolts (1) and the spacer plate (2).
3. Remove the flexplate (3).

1. Position the flexplate (3) onto the crankshaft.
2. Install the spacer (2) and the bolts (1) hand tight.
3. Tighten the flexplate retaining bolts (1) to 95 N.m (70 ft. lbs.) in a criss-cross pattern.
4. Install the transmission. Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information__installation) .

Scheme 215

Scheme 216

1. Wipe the cylinder bore clean.
2. Using a piston, to ensure that the ring is squared in the cylinder bore, slide the ring downward into the cylinder to a position 12 mm (0.50 in.) from the bottom of the cylinder bore.
3. Using a feeler gauge (1), check the ring end gap. Replace any rings not within specification. Ring Position Ring End Gap No. 1 (top) Ring 0.25 - 0.40 mm (0.010 - 0.016 in.) No. 2 (center) Ring 0.30 - 0.45 mm (0.012 - 0.018 in.) Oil Control Ring (Steel Rail) 0.15 - 0.66 mm (0.006- 0.26 in.)
4. Clean the piston ring grooves. Remove any nicks or burrs.
5. Measure the ring side clearance as shown in illustration. Make sure the feeler gauge (1) fits snugly between the ring land and the ring. Replace any ring not within specification.

Scheme 217

Note. Typical piston shown in illustration.

Scheme 218

Scheme 219

1. Remove the piston and connecting rod(s). Refer to «ROD, PISTON AND CONNECTING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . CAUTION: To avoid damage to the piston rings, they must be removed in the following order: No. 1 (upper) piston ring (1) No. 2 (intermediate) piston ring (2) Oil ring upper side rail (3) Oil ring lower side rail (4) Oil ring expander (5) NOTE: Typical piston shown in illustration.
2. Remove the No. 1 (upper) piston ring using a ring expander tool.
3. Remove the No. 2 (intermediate) piston ring using a ring expander tool. NOTE: Typical piston shown in illustration. Do not use a piston ring expander to remove the oil ring side rails.
4. Remove the oil ring upper side rail.
5. Remove the oil ring lower side rail.
6. Remove the oil ring expander (1).

Note. Typical piston shown in illustration.

Scheme 220

Scheme 221

1. If required, fit new rings to the piston. Refer to «Engine/Engine Block/RING(S), Piston - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . CAUTION: To avoid damage to the piston rings, they must be installed in the following order: Oil ring expander (5) Oil ring lower side rail (4) Oil ring upper side rail (3) No. 2 (intermediate) piston ring (2) No. 1 (upper) piston ring (1) NOTE: Typical piston shown in illustration. Do not use a piston ring expander to install the oil ring side rails.
2. Install the oil ring expander (1).
3. Install the oil ring lower side rail by placing one end between the piston ring groove and the oil ring expander. Hold this end firmly and press down the portion to be installed until the side rail is in position.
4. Install the oil ring upper side rail in the same manner as the lower side rail. NOTE: The No. 1 (upper) piston ring (1) and No. 2 (intermediate) piston ring (3) have a different cross section. Install the rings with manufacturers I.D. mark (dot) (2) facing up, towards the top of the piston. NOTE: Typical piston shown in illustration.
5. Install the No. 2 (intermediate) piston ring using a ring expander tool.
6. Install the No. 1 (upper) piston ring using a ring expander tool.
7. Rotate the rings around the piston, the rings must rotate in the grooves with out binding.
8. Position the piston ring end gaps as follows: Oil ring expander gap (5) Oil ring lower side rail end gap (4) Oil ring upper side rail end gap (1) No. 2 (intermediate) ring end gap (5) No. 1 (upper) ring end gap (2)
9. Install the piston and connecting rod(s). Refer to «ROD, PISTON AND CONNECTING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 222

The pistons are a lightweight design with ultra low tension piston rings for improved fuel economy. The pistons are made of a high strength aluminum alloy and the piston skirt has a Moly® coating. The top piston ring land has an anodized coating for improved wear. The piston is connected to the rod using a full floating pin with two locking clips. The connecting rod is forged steel with a bolted cracked cap design. The connecting rod bolts are not reusable. Pistons are available in two different diameters with grade markings for each bore indicated on the side of the cylinder block. The upper compression ring is a 1.2 mm steel ring with a spray coating. The intermediate compression ring is 1.2 mm micro napier design. Both compression rings have a dot or a mark on the piston ring. The marked side of the ring must face the top of the piston. The 2 mm three piece oil control ring is very thin. These are chrome plated rings and have a stainless steel expander.

PISTON FITTING

The pistons are "select fit" to achieve proper oil clearance. Engine block cylinder bore diameter grade markings (1) are stamped into the left side of the engine block. These marks are read from left to right, corresponding with cylinder number 1, 2, 3, 4, 5, 6.

Engine block cylinder bore diameter grade markings correspond to specific cylinder bore diameters. The chart below identifies the two engine block grade markings and their associated cylinder bore diameters.

Scheme 223

The piston is marked with the piston size (1 and 2) on the piston crown. The pistons are available in two different sizes in order to achieve the desired oil clearance. Select the piston size that corresponds to the engine block cylinder bore diameter grade markings for each cylinder.

Pistons are available in two sizes. The chart below identifies the two piston sizes.

Scheme 224

Note. Typical coated piston shown in illustration.

The coated pistons are serviced with the piston pin and connecting rod pre-assembled. The coating material (1 and 2) is applied to the piston after the final piston machining process. Piston installation into the cylinder bore requires slightly more pressure than that required for non-coated pistons. The bonded coating on the piston will give the appearance of a line-to-line fit with the cylinder bore.

Scheme 225

1. Mount Dial Indicator Set (special tool #C-3339A, Set, Dial Indicator) to a stationary point on the engine. Locate the probe perpendicular to and resting against the connecting rod cap being checked.
2. Move the connecting rod all the way to the rear of its travel.
3. Zero the dial indicator.
4. Move the connecting rod forward to the limit of travel and read the dial indicator. Compare the measured side clearance to the specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .
5. Repeat this procedure for each connecting rod. Rotate the crankshaft for connecting rod accessibility.

Scheme 226

1. Slide a snug-fitting feeler gauge between the connecting rod and crankshaft journal flange. Compare the measured side clearance to the specification. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .
2. Repeat this procedure for each connecting rod. Rotate the crankshaft for connecting rod accessibility.

1. Disconnect and isolate the negative battery cable.
2. Remove the oil pans, engine timing cover and cylinder heads. Refer to «CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Remove the engine oil pump. Refer to «PUMP, ENGINE OIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Remove the eight main bearing cap bolts from the windage tray in the sequence shown in illustration and remove the windage tray (1).
5. If necessary, remove the top ridge of the cylinder bores with a reliable ridge reamer before removing the pistons from the engine block. Be sure to keep the tops of pistons covered during this operation. Pistons and connecting rods must be removed from the top of the engine block. When removing piston and connecting rod assemblies from the engine, rotate the crankshaft CW so that each connecting rod is centered in the cylinder bore. CAUTION: DO NOT use a number stamp or a punch to mark connecting rods or caps, as damage to connecting rods could occur NOTE: Connecting rods and bearing caps are not interchangeable and should be marked before removing to ensure correct reassembly.
6. Mark connecting rod and bearing cap positions (1) using a permanent ink marker or scribe tool. NOTE: Typical V6 engine configuration shown in illustration. CAUTION: Care must be taken not to damage the fractured rod and cap joint face surfaces, as engine damage may occur.
7. Remove the connecting rod cap bolts (5) and the connecting rod cap (4). Discard the cap bolts. CAUTION: Care must be taken not to nick crankshaft journals, as engine damage may occur.
8. Remove the plastic guide plates (3) from the Guide Pins (special tool #8189, Guide Pins) (7) and install the Guide Pins to the connecting rod being removed. CAUTION: Avoid contact with the piston oil cooler jet(s). Positioning of the oil cooler jet(s) is critical for proper engine operation.
9. Remove the piston and connecting rod (1) from cylinder bore.
10. Repeat the previous steps for each piston being removed.
11. Immediately after piston and connecting rod removal, reinstall the bearing cap (4) on the mating connecting rod to prevent damage to the fractured cap and rod surfaces.
12. If required, remove the piston rings. Refer to «RING(S), PISTON, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
13. Repeat the previous steps for each piston being removed.

1. Using a suitable cleaning solvent clean the pistons in warm water and towel dry.
2. Use a wood or plastic scraper to clean the ring land grooves.

INSPECTION

1. Wipe the inserts (1) clean.
2. Inspect the inserts for abnormal wear patterns, scoring, grooving, fatigue, pitting and for metal or other foreign material imbedded in the lining.
3. Inspect the back of the inserts for fractures, scrapes, or irregular wear patterns.
4. Inspect the insert locking tabs for damage.
5. Replace any bearing that shows abnormal wear. Refer to «BEARING(S), CONNECTING ROD, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
6. Inspect the connecting rod bearing bores for signs of scoring, nicks and burrs. NOTE: Misaligned or bent connecting rods can cause abnormal wear on pistons, piston rings, cylinder walls, connecting rod bearings and crankshaft connecting rod journals. If wear patterns or damage to any of these components indicate the probability of a misaligned connecting rod, inspect it for correct rod alignment.
7. Replace misaligned, bent or twisted connecting rods. NOTE: Connecting rods are serviced with the piston pre-assembled. The pistons are "select fit" to achieve proper oil clearance. Refer to «Engine/Engine Block/ROD, Piston and Connecting - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Typical coated piston shown in illustration.
8. Inspect the piston for scoring or scraping marks in the piston skirts. Check the ring lands for cracks and/or deterioration.
9. Check the piston for taper and out of round shape. NOTE: The coating material (1 and 2) is applied to the piston after the final piston machining process. Measuring the outside diameter of a coated piston will not provide accurate results. Therefore measuring the inside diameter of the cylinder bore with a dial Bore Gauge is MANDATORY . Refer to «Engine/Engine Block - Inspection»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
10. Compare the measured cylinder bore diameter to the engine block cylinder bore grade marking chart Select the piston size that corresponds to the engine block markings for each cylinder to provide the proper oil clearance. Refer to «Engine/Engine Block/ROD, Piston and Connecting - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Note. Piston installation into the cylinder bore requires slightly more pressure than that required for non-coated pistons. The bonded coating on the piston will give the appearance of a line-to-line fit with the cylinder bore.

Note. The coated pistons will be serviced with the piston pin and connecting rod pre-assembled.

Scheme 227

1. If required, select and fit new piston and connecting rod assemblies to the engine block. Refer to «Engine/Engine Block/ROD, Piston and Connecting - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. If required, select and fit new bearings to the connecting rod. Refer to «BEARING(S), CONNECTING ROD, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. If required, hone the cylinder bores. Refer to «Engine/Engine Block - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. If removed, install the piston rings. Refer to «RING(S), PISTON, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Position the piston ring end gaps as follows: Oil ring expander gap (5) Oil ring lower side rail end gap (4) Oil ring upper side rail end gap (1) No. 2 (intermediate) ring end gap (5) No. 1 (upper) ring end gap (2) NOTE: Typical V6 engine configuration shown in illustration. NOTE: Ensure the position of the ring end gaps does not change when installing the ring compressor.
6. Lubricate the piston rings with clean engine oil. Position Piston Compressor (special tool #C-385, Compressor, Piston) (2) over the piston and rings. Tighten the compressor (2). NOTE: Install the rod bearings in pairs. Do not mix sizes or use a new bearing half with an old bearing half.
7. Install the bearing shell (8) on the connecting rod with the tang inserted into the machined groove in the rod. Lubricate the bearing surface with clean engine oil.
8. Remove the plastic guide plates (3) from the Guide Pins (special tool #8189, Guide Pins) (7) and install the Guide Pins to the connecting rod being installed. NOTE: Right cylinder bank shown in illustration, left cylinder bank similar.
9. The pistons crowns are stamped with a mark (1) indicating installation position. This mark must be positioned toward the front of engine on both cylinder banks.
10. Wipe the cylinder bore clean and lubricate with clean engine oil.
11. Rotate the crankshaft until the connecting rod journal is on the center of cylinder bore. CAUTION: Avoid contact with the piston oil cooler jet(s). Positioning of the oil cooler jet(s) is critical for proper engine operation.
12. Insert the piston and connecting rod into the cylinder bore and carefully position the guide pins over the crankshaft journal.
13. Tap the piston down in the cylinder bore using a hammer handle while guiding the connecting rod into position over the rod journal. NOTE: Typical V6 engine configuration shown in illustration. CAUTION: The connecting rod bolts must not be reused. Always replace the connecting rod bolts whenever they are loosened or removed.
14. Install the bearing shell (6) on the connecting rod cap (4) with the tang inserted into the machined groove in the cap. Lubricate the bearing surface with clean engine oil. NOTE: Do not lubricate the threads of the connecting rod cap bolts (5).
15. Install the connecting rod cap and bearing with the tang on the same side as the rod. Tighten the NEW connecting rod cap bolts (5) to 20 N.m (15 ft. lbs.) plus 90°.
16. If required, check the connecting rod side clearance. Refer to «Engine/Engine Block/ROD, Piston and Connecting - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
17. Repeat the previous steps for each piston being installed. CAUTION: The main bearing cap bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced.
18. Check the main bearing cap bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced.
19. Install the windage tray with eight main bearing cap bolts. Tighten the bolts in the sequence shown in illustration to 21 N.m (16 ft. lbs.) plus 90°.
20. Install the engine oil pump and oil pump pick-up. Refer to «PUMP, ENGINE OIL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
21. Install the cylinder heads, engine timing cover and oil pans. Refer to «CYLINDER HEAD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
22. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
23. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
24. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
25. Operate the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

Scheme 228

Scheme 229

Scheme 230

1. Remove the accessory drive belt and the crankshaft vibration damper. Refer to «DAMPER, VIBRATION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. Install the sleeve (2) from Seal Remover (special tool #8511, Remover, Seal) around the flywheel key (1) and onto the nose of the crankshaft.
3. Screw Seal Remover (special tool #8511, Remover, Seal) (1) into the front crankshaft oil seal (2).
4. Install the extractor screw (2) into the Seal Remover (special tool #8511, Remover, Seal) (1). Hold the seal remover stationary and tighten the extractor screw against the sleeve until the front crankshaft oil seal (3) is removed from the engine timing cover.

Scheme 231

1. Position the front crankshaft oil seal (3) into place on the engine timing cover.
2. Align the Front Crankshaft Seal Installer (special tool #10199, Installer, Crankshaft Front Oil Seal) (1) to the flywheel key on the crankshaft and against the front crankshaft oil seal (3). CAUTION: Only tighten the crankshaft vibration damper bolt until the oil seal is seated in the cover. Overtightening of the bolt can crack the front timing cover.
3. Install and tighten the crankshaft vibration damper bolt (2) until the Crankshaft oil seal is seated in the engine timing cover.
4. Install the crankshaft vibration damper and accessory drive belt. Refer to «DAMPER, VIBRATION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 232

The rear crankshaft oil seal is incorporated into the seal retainer (2) and can not be removed from the retainer. The rear crankshaft oil seal and seal retainer (2) are serviced as an assembly.

1. Remove the transmission. Refer to «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information__removal) .
2. Remove the flexplate. Refer to «FLEXPLATE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Remove the upper oil pan. Refer to «PAN, OIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Remove the eight seal retainer attaching screws (1).
5. Remove and discard the seal retainer (2).

Scheme 233

Scheme 234

Scheme 235

1. Inspect the crankshaft to make sure there are no nicks or burrs on the seal surface.
2. Clean the engine block sealing surfaces thoroughly. NOTE: It is not necessary to lubricate the seal or the crankshaft when installing the seal retainer. Residual oil following installation can be mistaken for seal leakage.
3. Carefully position the oil seal retainer assembly (2), and seal protector (1) on the crankshaft and push firmly into place on the engine block (during this step, the seal protector will be pushed from the rear oil seal assembly as a result of installing the rear oil seal).
4. Verify that the seal lip (2) on the retainer is uniformly curled inward toward the engine on the crankshaft (1).
5. Install the eight seal retainer bolts (1) and tighten to 12 N.m (106 in. lbs.). NOTE: Make sure that the seal retainer flange is flush with the engine block oil pan sealing surface.
6. Install the upper oil pan. Refer to «PAN, OIL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
7. Install the flexplate. Refer to «FLEXPLATE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
8. Install the transmission. Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/automatic-trans/#nag1-automatic-transmission-service-information__installation) .
9. Fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 236

1. Disconnect and isolate the negative battery cable.
2. Remove the air inlet hose, upper intake manifold (2) and insulator. Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . CAUTION: The engine must be raised substantially to facilitate engine mount removal. Failure to disconnect the left CMP sensor may result in damage to the sensor and/or wire harness connector.
3. Disconnect the left Camshaft Position (CMP) sensor (5). NOTE: Left engine mount shown in illustration, right engine mount similar.
4. Remove the bolts (1) and the engine mount heatshield (2) from both the left and right engine mounts. NOTE: Left engine mount shown in illustration, right engine mount similar.
5. Remove both the left and right engine mount nuts (1).
6. Install Engine Support Fixture (special tool #8534B, Support Fixture, Engine) and carefully lift the engine as high as possible.
7. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
8. If equipped, remove the front skid plate and front suspension skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
9. If equipped with AWD, remove the front axle (1). Refer to «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/differentials-drive-axles/#front-axle-195fia__removal) . NOTE: Power steering pump not shown in illustration.
10. Remove the nut (1) and bolt (4) from the support brackets and reposition the heater core return tube (3).
11. Remove the four bolts (5) from the left engine mount bracket (1).
12. Remove the two bolts (3) from the left engine mount isolator (4).
13. Reposition the engine mount bracket (1) and isolator (4).
14. Remove the starter. Refer to «STARTER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/starter/#starting-service-information) .
15. Rotate the isolator into the starter location and separate it from the engine mount bracket. Remove the left engine mount isolator (1) from the vehicle.
16. If required, remove the left engine mount bracket (1) from the vehicle.

INSTALLATION - LEFT ENGINE MOUNT INSULATOR

1. If removed, position the left engine mount bracket (1) into the vehicle.
2. Install the left engine mount isolator (4) into the vehicle.
3. Utilize the space from the absent starter to insert the isolator stud into the bracket and rotate the assembly into position.
4. Install the starter. Refer to «STARTER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/starter/#starting-service-information) .
5. Install the left engine mount isolator (4) to the frame with two bolts (3) tightened to 61 N.m (45 ft. lbs.).
6. Install the left engine mount bracket (1) to the engine block with four bolts (5) tightened to 61 N.m (45 ft. lbs.). NOTE: Power steering pump not shown in illustration.
7. Install the nut (1) and bolt (4) to the support brackets of the heater core return tube (3). Tighten both fasteners to 12 N.m (106 in. lbs.).
8. If equipped with AWD, install the front axle (1). Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/differentials-drive-axles/#front-axle-195fia__installation) .
9. If equipped, install the front skid plate and front suspension skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) . NOTE: Left engine mount shown in illustration, right engine mount similar.
10. Lower the vehicle.
11. Align the tab on the isolators (3) with the notch in the engine mount brackets (2) and lower the engine so the weight is resting on the isolators.
12. Install the left and right engine mount nuts (1) and tighten to 61 N.m (45 ft. lbs.). NOTE: Left engine mount shown in illustration, right engine mount similar.
13. Install the engine mount heatshield (2) to both the left and right engine mounts with two bolts (1) tightened to 12 N.m (106 in. lbs.).
14. Connect the left Camshaft Position (CMP) sensor (5).
15. Install the upper intake manifold, insulator and air inlet hose. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
16. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Scheme 237

Scheme 238

Scheme 239

1. Disconnect and isolate the negative battery cable.
2. Remove the air inlet hose, upper intake manifold (2) and insulator. Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . CAUTION: The engine must be raised substantially to facilitate engine mount removal. Failure to disconnect the left CMP sensor may result in damage to the sensor and/or wire harness connector.
3. Disconnect the left Camshaft Position (CMP) sensor (5).
4. Remove the accessory drive belt (4). Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
5. Remove the generator (8). Refer to «GENERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#charging-service-information) . NOTE: Left engine mount shown in illustration, right engine mount similar.
6. Remove the bolts (1) and the engine mount heatshield (2) from both the left and right engine mounts.
7. Remove the ground strap (1) from the right engine mount bracket. NOTE: Left engine mount shown in illustration, right engine mount similar.
8. Remove both the left and right engine mount nuts (1).
9. Install Engine Support Fixture (special tool #8534B, Support Fixture, Engine) and carefully lift the engine as high as possible.
10. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
11. If equipped, remove the front skid plate and front suspension skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
12. If equipped with AWD, remove the right front half shaft (1). Refer to «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/axle-shafts/#front-half-shaft) and «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/axle-shafts/#rear-half-shaft) .
13. Disengage one main wire harness retainer (2) from the right engine mounting bracket.
14. Remove the four bolts (3) from the right engine mount bracket (2).
15. Remove the two bolts (5) from the right engine mount isolator (4).
16. Separate the isolator (4) from the engine mount bracket (2) and remove the isolator from the vehicle.
17. If required, remove the right engine mount bracket (2) from the vehicle.

INSTALLATION - RIGHT ENGINE MOUNT INSULATOR

1. If removed, position the right engine mount bracket (2) into the vehicle.
2. Install the right engine mount isolator (4) into the vehicle.
3. Insert the isolator stud into the bracket and rotate the assembly into position.
4. Install the right engine mount isolator (4) to the frame with two bolts (5) tightened to 61 N.m (45 ft. lbs.).
5. Install the right engine mount bracket (2) to the engine block with four bolts (3) tightened to 61 N.m (45 ft. lbs.).
6. Engage one main wire harness retainer (2) to the right engine mounting bracket.
7. If equipped with AWD, install the right front half shaft (1). Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/axle-shafts/#front-half-shaft) and «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/axle-shafts/#rear-half-shaft) .
8. If equipped, install the front skid plate and front suspension skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) . NOTE: Left engine mount shown in illustration, right engine mount similar.
9. Lower the vehicle.
10. Align the tab on the isolators (3) with the notch in the engine mount brackets (2) and lower the engine so the weight is resting on the isolators.
11. Install the left and right engine mount nuts (1) and tighten to 61 N.m (45 ft. lbs.).
12. Install the ground strap (1) to the right engine mount bracket. NOTE: Left engine mount shown in illustration, right engine mount similar.
13. Install the engine mount heatshield (2) to both the left and right engine mounts with two bolts (1) tightened to 12 N.m (106 in. lbs.).
14. Install the generator (8). Refer to «GENERATOR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#charging-service-information) .
15. Install the accessory drive belt (4). Refer to «BELT, SERPENTINE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__installation) .
16. Connect the left Camshaft Position (CMP) sensor (5).
17. Install the upper intake manifold, insulator and air inlet hose. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
18. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Scheme 240

Scheme 241

Scheme 242

Scheme 243

Scheme 244

1. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the skid plate, if equipped. Refer to «PLATE, SKID, FRONT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, FRONT SUSPENSION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, FUEL TANK, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, TRANSMISSION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) and «PLATE, SKID, TRANSFER CASE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
3. Remove four bolts (2) and the left crossmember brace (1).
4. Remove two bolts (3) and the right crossmember brace (4).
5. Remove the two bolts (2) from the rear engine mount isolator.
6. Using a suitable jack stand and a block of wood positioned under the transmission oil pan, raise the transmission until the weight is off of the isolator (approximately 5 mm).
7. Remove six bolts (3) and the crossmember (1).
8. On 4x4 vehicles, remove three bolts (2) and the rear engine mount isolator (1).
9. On 4x2 vehicles, remove three bolts (2) and the rear engine mount isolator (1).
10. On 4x2 vehicles if required, remove four bolts (1) and the rear engine mount bracket (2).

INSTALLATION - REAR ENGINE MOUNT INSULATOR

1. On 4x2 vehicles if removed, install the rear engine mount bracket (2) with four bolts (1) tightened to 33 N.m (24 ft. lbs.).
2. On 4x2 vehicles, install the rear engine mount isolator (1) with three bolts (2) tightened to 61 N.m (45 ft. lbs.).
3. On 4x4 vehicles, install the rear engine mount isolator (1) with three bolts (2) tightened to 61 N.m (45 ft. lbs.).
4. Install the crossmember (1) with six bolts (3) tightened to 55 N.m (41 ft. lbs.).
5. Lower the transmission so the weight is resting on the isolator.
6. Install two bolts (2) to the rear engine mount isolator and tighten to 61 N.m (45 ft. lbs.).
7. Install the left crossmember brace (1) with four bolts (2) tightened to 55 N.m (41 ft. lbs.).
8. Install the right crossmember brace (4) with two bolts (3) tightened to 55 N.m (41 ft. lbs.).
9. Install the skid plate, if equipped. Refer to «PLATE, SKID, FRONT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, FRONT SUSPENSION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, FUEL TANK, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, TRANSMISSION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) and «PLATE, SKID, TRANSFER CASE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
10. Lower the vehicle.

Scheme 245

The lubrication system is a full flow filtration, pressure feed type lubrication system. The oil pump is mounted to the bottom of the cylinder block and chain driven by the crankshaft sprocket. The oil pump pick-up tube is attached to the oil pump and supported at the windage tray. There are three oil gallery plugs installed in the engine block. A system oil pressure sensor allows oil pressure to be monitored with a diagnostic scan tool. The oil pressure and oil temperature sensors are located on the oil filter housing assembly which is mounted to the top of the engine block between the cylinder heads. The oil cooler is mounted to the oil filter housing. There is a pressure relief valve in the oil pump that is only activated on a cold start or for emergency relief since the oil pump output is self-regulating. There are three piston oil cooler jets mounted to the engine block. Each jet cools two pistons.

Scheme 246

The oil from the oil pan is pumped by a vane type oil pump mounted to the bottom of the cylinder block that is chain driven by the crankshaft sprocket. The oil from the pump travels to the oil filter element and then to the oil cooler assembly. After the oil has been filtered and cooled, the oil enters the main oil gallery. The pressurized oil travels through the main gallery to the four main journals to lubricate the crankshaft main bearings. The pressurized oil travels through the crankshaft main journals to cross-drilling supplying oil to the connecting rod journals. From the number one main bearing gallery, oil travels to the right secondary chain tensioner and to the primary chain idler shaft. The main oil gallery also supplies oil to three sets of piston oil cooling jets. From the cylinder block the oil flows through drillings into the left and right cylinder heads. Left cylinder head oil is supplied to the left secondary timing chain tensioner, camshaft journals and hydraulic lash adjusters. Right cylinder hear oil is supplied to the right camshaft journals and hydraulic lash adjusters. The camshaft valve lobes and rocker arms are lubricated through a small hole in the rocker arm; oil flows through the lash adjuster then through the rocker arm and onto the camshaft lobe. Oil also flows through each of the four forward camshaft bearings into the camshafts and phasers.

ENGINE LUBRICATION FLOW CHART

ENGINE OIL LEAK

Begin with a thorough visual inspection of the engine, particularly at the area of the suspected leak. If an oil leak source is not readily identifiable, the following steps should be followed

1. Do not clean or de-grease the engine at this time because some solvents may cause rubber to swell, temporarily stopping the leak.
2. Add an oil soluble dye (use as recommended by manufacturer). Start the engine and let idle for approximately 15 minutes. Check the oil dipstick to make sure the dye is thoroughly mixed as indicated with a bright yellow color under a black light.
3. Using a black light, inspect the entire engine for fluorescent dye, particularly at the suspected area of the oil leak. If the oil leak is found and identified, repair per service information instructions.
4. If dye is not observed, drive the vehicle at various speeds for approximately 24 km (15 miles), and repeat the inspection. If the oil leak source is not positively identified at this time, proceed with the AIR LEAK DETECTION TEST METHOD below.

AIR LEAK DETECTION TEST METHOD

1. Disconnect the make-up air hose from the cylinder head cover. Cap or plug the make-up air hose nipple.
2. Remove the PCV hose from the PCV valve. Cap or plug the PCV valve nipple.
3. Attach an air hose with a pressure gauge and regulator to the dipstick tube. CAUTION: Do not subject the engine assembly to more than 20.6 kPa (3 PSI) of test pressure.
4. Gradually increase air pressure from 1 psi to 2.5 psi maximum while applying soapy water at the suspected leak source. Adjust the regulator to a suitable test pressure within this range that provides the best bubble generation which will pinpoint the leak source. If the oil leak is detected and identified, repair per service information procedures.
5. If the leakage occurs at the rear oil seal area, follow the procedures for rear seal area leaks. Refer to «REAR SEAL AREA LEAKS»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__rear-seal-area-leaks) .
6. If no leaks are detected, turn off the air supply and remove the air hose and all plugs and caps. Install the PCV valve and make-up air hoses.
7. Clean the oil off of the suspect oil leak area using a suitable solvent. Drive the vehicle at various speeds approximately 24 km (15 miles). Inspect the engine for signs of an oil leak by using a black light.

Scheme 247

Scheme 248

1. Disconnect and isolate the negative battery cable.
2. Remove the oil pressure sensor (2) from the oil filter housing (3). Refer to «SENSOR, OIL PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Install Pressure Gauge (special tool #C-3292A, Gauge, Pressure) (1) to the oil pressure port. Tighten to 20 N.m (177 in. lbs.).
4. Install the upper and lower intake manifolds and air inlet hose. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
6. Start and idle the engine. If oil pressure is 0 at idle, shut off the engine and consult the Engine Lubrication and Diagnostic Table. Refer to «ENGINE LUBRICATION DIAGNOSTIC TABLE»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__engine-lubrication-diagnostic-table) .
7. Run the engine until it reaches normal operating temperature.
8. Verify that the engine has acceptable oil pressure. Refer to «Engine - Specifications»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__specifications) .

REAR SEAL AREA LEAKS

Since it is sometimes difficult to determine the source of an oil leak in the rear seal area of the engine, a more involved inspection is necessary. The following steps should be followed to help pinpoint the source of the leak.

If the leakage occurs at the crankshaft rear oil seal area

1. Disconnect and isolate the negative battery cable.
2. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
3. Remove the bolt (2) and the torque converter dust shield (3).
4. Remove two rubber plugs (1) covering the rear oil seal retainer flange bolts.
5. Inspect the flexplate and rear of the block for evidence of oil. Use a black light to check for the oil leak: Circular spray pattern generally indicates seal leakage or crankshaft damage. Where leakage tends to run straight down, possible causes are a porous block, rear oil seal retainer, oil galley pipe plug and rear seal retainer to oil pan mating surfaces.
6. If no leaks are detected, use the Air Leak Detection Method as outlined in Engine Oil Leak. Refer to «AIR LEAK DETECTION TEST METHOD»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information__air-leak-detection-test-method) . CAUTION: Do not subject the engine assembly to more than 20.6 kPa (3 PSI) of test pressure.
7. If the leak is not detected, very slowly turn the crankshaft and watch for leakage. If a leak is detected between the crankshaft and seal while slowly turning the crankshaft, it is possible the crankshaft seal surface is damaged. The seal area on the crankshaft could have minor nicks or scratches that can be polished out with emery cloth. CAUTION: Use extreme caution when crankshaft polishing is necessary to remove minor nicks or scratches. The crankshaft seal flange is specially machined to complement the function of the rear oil seal.
8. For bubbles that remain steady with shaft rotation, no further inspection can be done until disassembled. Refer to «SEAL, CRANKSHAFT OIL, REAR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 249

The oil filter housing is located in the V of the cylinder block. The oil filter element is located within the housing and the engine oil cooler is attached to the top of the housing. Both the oil pressure and oil temperature sensors are located at the rear of the housing.

Scheme 250

Oil flows from the engine oil pump to the oil filter housing inlet (1) and to the oil filter element located within the oil filter housing. After the oil is filtered and then cooled it travels to the main oil gallery (5). An oil filter by-pass is built into the housing and is not serviceable. Removing the oil filter cap from the housing allows oil to drain from the oil filter cavity into to the crankcase (2).

Coolant flows from the right cylinder block water jacket (3) and from the left cylinder block water jacket (4) into the housing. The coolant flows through the oil cooler and exits the housing from the rear hose nipple (6) where it is returned to the water pump. A coolant by-pass in the housing is designed to direct excessive coolant flow around the oil cooler for continuous circulation.

Scheme 251

Scheme 252

Scheme 253

Scheme 254

1. Perform the fuel pressure release procedure. Refer to «FUEL SYSTEM PRESSURE RELEASE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
2. Disconnect and isolate the negative battery cable.
3. Drain the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
4. Remove the air cleaner housing assembly, upper and lower intake manifolds. Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Disconnect the oil temperature sensor electrical connector (5).
6. Disconnect the oil pressure sensor electrical connector (4).
7. Remove five bolts (2) and remove the oil filter housing (1).
8. Lift the oil filter housing (1) and remove the heater hose (3).
9. Remove and discard the oil filter housing seals (2). The O-ring seal (1) can be reused.
10. If required, remove two screws (1) and (3) and remove the oil cooler (4) from the oil filter housing.
11. Remove and discard the oil cooler seals (1).
12. If required, remove the oil temperature sensor (1) from the oil filter housing (3).
13. If required, remove the oil pressure sensor (2) from the oil filter housing (3).

Scheme 255

1. If removed, install the oil pressure sensor (2) and tighten to 20 N.m (177 in. lbs.).
2. If removed, install the oil temperature sensor (1) and tighten to 20 N.m (177 in. lbs.). NOTE: Always use new dry seals (1) when installing the oil cooler. Do not lubricate the seals.
3. If removed, install the new oil cooler seals (1) onto the oil filter housing (2).
4. If removed, position the oil cooler (4) on the oil filter housing and install two screws (1) and (3). Tighten the screws to 4 N.m (35 in. lbs.). NOTE: Always use new dry seals (2) when installing the oil filter housing. Do not lubricate the seals. The O-ring seal (1) can be reused. Lubricate the O-ring seal with clean engine oil prior to installation.
5. Install new oil filter housing seals (2) onto the oil filter housing.
6. Install the heater hose (2) to the oil filter housing (1).
7. Position the oil filter housing (1) on the engine block.
8. Install five bolts and tighten in the sequence shown in illustration to 12 N.m (106 in. lbs.).
9. Connect the oil pressure sensor electrical connector (3).
10. Connect the oil temperature sensor electrical connector (4).
11. Install the upper and lower intake manifolds and air cleaner housing assembly. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
12. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
13. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
14. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
15. Operate the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

DESCRIPTION

The oil cooler is attached to the top of the oil filter housing which is located in the V of the cylinder block. The oil cooler is a plate style coolant-to-oil heat exchanger.

OPERATION

Oil flows from the engine oil pump to the oil filter housing inlet (1) and to the oil filter element located within the oil filter housing. After the oil is filtered it travels internally through the engine oil cooler and then to the main oil gallery (5).

Coolant flows from the right cylinder block water jacket (3) and from the left cylinder block water jacket (4) into the housing. The coolant flows through the oil cooler and exits the housing from the rear hose nipple (6) where it is returned to the water pump. A coolant by-pass in the housing is designed to direct excessive coolant flow around the oil cooler for continuous circulation.

Note. The oil cooler can not be cleaned out. In the event that the engine requires rebuilding or replacement, replace the oil cooler.

1. Perform the fuel pressure release procedure. Refer to «FUEL SYSTEM PRESSURE RELEASE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
2. Disconnect and isolate the negative battery cable.
3. Drain the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
4. Remove the air cleaner housing assembly, upper and lower intake manifolds. Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Remove four bolts (2) and two screws (1) and (3).
6. Remove the oil cooler (4).
7. Remove and discard the oil cooler seals (1).

Note. Always use new dry seals (1) when installing the oil cooler. Do not lubricate the seals.

1. Install the new oil cooler seals (1) onto the oil filter housing (2).
2. Position the oil cooler (4) on the oil filter housing.
3. Install two screws (1) and (3). Tighten the screws to 4 N.m (35 in. lbs.).
4. Install four bolts (2) and tighten to 12 N.m (106 in. lbs.).
5. Install the upper and lower intake manifolds and air cleaner housing assembly. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
6. Fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
7. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
8. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
9. Operate the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

Scheme 256

All engines are equipped with a high quality full-flow, disposable type oil filter. Chrysler Corporation recommends a Mopar® or equivalent oil filter be used.

Scheme 257

1. Place an oil absorbent cloth around the oil filter housing at the base of the oil filter cap. NOTE: The oil filter (3) is attached to the oil filter cap (2).
2. Rotate the oil filter cap (1) counterclockwise and remove the cap (1) and filter (3) from the oil filter housing.
3. Remove the oil filter (3) from the oil filter cap (2).
4. Remove and discard the O-ring seal (1).

Note. It is not necessary to pre-oil the oil filter or fill the oil filter housing.

Scheme 258

1. Lightly lubricate the new O-ring seal (1) with clean engine oil.
2. Install the O-ring seal (1) on the filter cap (2).
3. Install the new oil filter (3) into the oil filter cap (2).
4. Thread the oil filter cap (1) into the oil filter housing and tighten to 25 N.m (18 ft. lbs.).
5. Add oil, verify crankcase oil level and start engine. Inspect for oil leaks. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

ENGINE OIL AND FILTER CHANGE

Change the engine oil and filter at mileage and time intervals described in the Maintenance Schedule. Refer to MAINTENANCE SCHEDULES, DESCRIPTION .

Scheme 259

Scheme 260

1. Run the engine until achieving normal operating temperature.
2. Position the vehicle on a level surface and turn the engine off.
3. Remove the oil filter access cover (1). NOTE: Graphic shows engine cover removed for clarity. CAUTION: When performing an engine oil change, the oil filter cap must be removed. Removing the oil filter cap releases oil held within the oil filter cavity and allows it to drain into the sump. Failure to remove the cap prior to reinstallation of the drain plug will not allow complete draining of the used engine oil.
4. Place an oil absorbent cloth around the oil filter housing at the base of the oil filter cap. NOTE: The oil filter (3) is attached to the oil filter cap (2).
5. Rotate the oil filter cap (1) counterclockwise and remove the cap (1) and filter (3) from the oil filter housing.
6. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
7. Place a suitable drain pan under the crankcase drain plug (1).
8. Remove the drain plug (1) from oil pan and allow the oil to drain into the pan. Inspect the drain plug threads for stretching or other damage. Replace the drain plug and gasket if damaged.
9. Install the drain plug (1) in the oil pan and tighten to 27 N.m (20 ft. lbs.).
10. Lower the vehicle.
11. Remove the oil filter (3) from the oil filter cap (2).
12. Remove and discard the O-ring seal (1). NOTE: It is not necessary to pre-oil the oil filter or fill the oil filter housing.
13. Lightly lubricate the new O-ring seal (1) with clean engine oil.
14. Install the O-ring seal (1) on the filter cap (2).
15. Install the new oil filter (3) into the oil filter cap (2). NOTE: Graphic shows engine cover removed for clarity.
16. Thread the oil filter cap (1) into the oil filter housing and tighten to 25 N.m (18 ft. lbs.).
17. Remove the oil fill cap (2). Fill the crankcase with the specified type and amount of engine oil. Refer to «CAPACITIES AND RECOMMENDED FLUIDS, SPECIFICATIONS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference__specifications) .
18. Install the oil fill cap (2).
19. Start the engine and inspect for leaks.
20. Stop the engine and check the oil level (3).

OIL FILTER SPECIFICATION

All engines are equipped with a high quality full-flow, disposable type oil filter. When replacing oil filter, use a Mopar® filter or equivalent.

USED ENGINE OIL DISPOSAL

Care should be exercised when disposing of used engine oil after it has been drained from a vehicle engine. Refer to the WARNING listed above.

Scheme 261

There is an upper and lower oil pan. The upper oil pan is cast aluminum and also serves as the lower end structural support. The lower pan is a stamped steel design. Both upper and lower oil pans are sealed using Mopar® Threebond Engine RTV Sealant. The lower oil pan must be removed in order to access all of the upper oil pan attaching bolts.

Scheme 262

The high pressure die cast aluminum windage tray is mounted to the main bearing caps and is designed to keep oil off of the connecting rods as the crankshaft rotates. When the oil is kept off the connecting rods, the engine rotates easier and oil foaming decreases. Like the oil pan, the windage tray is designed to stiffen the lower end of the engine. The tray is directional and the main bearing cap bolts hold it in place.

Scheme 263

Scheme 264

1. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Drain the engine oil. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Remove the front suspension skid plate, if equipped. Refer to «PLATE, SKID, FRONT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, FRONT SUSPENSION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, FUEL TANK, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, TRANSMISSION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) and «PLATE, SKID, TRANSFER CASE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) . NOTE: The lower oil pan must be removed to access all of the upper oil pan retaining bolts.
4. Remove twelve bolts (1), two nuts (3) and two studs (2) from the flange of the lower oil pan. CAUTION: Do not pry on the lower oil pan flange. There are no designated pry points for lower oil pan removal. Prying on only one or a few locations could bend the flange and damage the pan.
5. Using a pry bar (1), apply a side force to the lower oil pan (2) in order to shear the sealant bond and remove the pan.
6. Remove all residual sealant (1) from the upper and lower oil pans. Refer to «PAN, OIL, CLEANING»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 265

Scheme 266

Scheme 267

Scheme 268

Scheme 269

1. Disconnect and isolate the negative battery cable.
2. Remove the bolt (1) and remove the oil level indicator (2).
3. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
4. Drain the engine oil. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. If equipped, remove the front skid plate and the front suspension skid plate. Refer to «UNDER BODY PROTECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) . NOTE: The lower oil pan must be removed to access all of the upper oil pan retaining bolts.
6. Remove the lower oil pan. Refer to «PAN, OIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
7. If equipped with AWD, remove the front axle (1). Refer to «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/differentials-drive-axles/#front-axle-195fia__removal) .
8. Remove the steering gear (1). Refer to «GEAR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/manual-power-steering/#steering-system) .
9. Remove two rubber plugs (1) covering the rear oil seal retainer flange bolts.
10. Remove two bolts (1) from the rear oil seal retainer flange.
11. Unclip the transmission cooler line retainer (1) from the oil pan flange.
12. Remove four transmission to the engine oil pan bolts (1).
13. Remove nineteen oil pan mounting bolts (1).
14. Using the four indicated pry points, carefully remove the upper oil pan.
15. Remove all residual sealant (1) from the upper and lower oil pans, timing chain cover, rear seal retainer and engine block mating surfaces. Refer to «PAN, OIL, CLEANING»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Scheme 270

Scheme 271

1. Clean the oil pan in solvent and wipe dry with a clean cloth. CAUTION: Do not use oil based liquids, wire brushes, abrasive wheels or metal scrapers to clean the engine gasket surfaces. Use only isopropyl (rubbing) alcohol, along with plastic or wooden scrapers. Improper gasket surface preparation may result in engine fluid leakage.
2. Remove all residual sealant (1) from the upper and lower oil pans. Refer to «Engine - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

LOWER OIL PAN

1. Clean the upper and lower oil pan mating surfaces with isopropyl alcohol in preparation for sealant application. CAUTION: Engine assembly requires the use of a unique sealant that is compatible with engine oil. Using a sealant other than Mopar® Threebond Engine RTV Sealant may result in engine fluid leakage. CAUTION: Following the application of Mopar® Threebond Engine RTV Sealant to the gasket surfaces, the components must be assembled within 20 minutes and the attaching fasteners must be tightened to specification within 45 minutes. Prolonged exposure to the air prior to assembly may result in engine fluid leakage.
2. Apply a 2 to 3 mm wide bead of Mopar® Threebond Engine RTV Sealant (1) to the lower oil pan as shown in illustration.
3. Install two studs (2) into the upper oil pan flange.
4. Install the lower oil pan to the upper oil pan with twelve bolts (1) and two nuts (3) tightened to 10.5 N.m (93 in. lbs.). CAUTION: Following assembly, the Mopar® Threebond Engine RTV Sealant must be allowed to dry for 45 minutes prior to adding oil and engine operation. Premature exposure to oil prior to drying may result in engine fluid leakage.
5. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
6. Run the engine until it reaches normal operating temperature.

UPPER OIL PAN

1. Clean the upper and lower oil pans, timing chain cover, rear seal retainer and engine block mating surfaces with isopropyl alcohol in preparation for sealant application. CAUTION: Engine assembly requires the use of a unique sealant that is compatible with engine oil. Using a sealant other than Mopar® Threebond Engine RTV Sealant may result in engine fluid leakage. CAUTION: Following the application of Mopar® Threebond Engine RTV Sealant to the gasket surfaces, the components must be assembled within 20 minutes and the attaching fasteners must be tightened to specification within 45 minutes. Prolonged exposure to the air prior to assembly may result in engine fluid leakage.
2. Apply a 2 to 3 mm wide bead of Mopar® Threebond Engine RTV Sealant to the upper oil pan as shown in illustration in the following locations: Oil pan to engine block flange (1) Two timing cover to engine block T-joints (2) Two rear seal retainer to engine block T-joints (3) CAUTION: Make sure that the rear face of the oil pan is flush to the transmission bell housing before tightening any of the oil pan mounting bolts. A gap between the oil pan and the transmission could crack the oil pan or transmission casting.
3. Install the oil pan to the engine block and flush to the transmission bell housing. Secure the oil pan to the engine block with nineteen oil pan mounting bolts (1) finger tight.
4. Install four transmission to the engine oil pan bolts (1) and tighten to 55 N.m (41 ft. lbs.).
5. Tighten the nineteen previously installed oil pan mounting bolts (1) to 25 N.m (18 ft. lbs.).
6. Install two bolts (1) to the rear oil seal retainer flange and tighten to 12 N.m (106 in. lbs.).
7. Install two rubber plugs (1) covering the rear oil seal retainer flange bolts.
8. Clip the transmission cooler line retainer (1) to the oil pan flange.
9. Install the steering gear (1). Refer to «GEAR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/manual-power-steering/#steering-system) .
10. If equipped with AWD, install the front axle (1). Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/differentials-drive-axles/#front-axle-195fia__installation) .
11. Install the lower oil pan. Refer to «PAN, OIL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
12. Install the front skid plate, if equipped. Refer to «PLATE, SKID, FRONT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, FRONT SUSPENSION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, FUEL TANK, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) , «PLATE, SKID, TRANSMISSION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) and «PLATE, SKID, TRANSFER CASE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
13. Lower the vehicle.
14. Install the oil level indicator (2) with bolt (1) tightened 12 N.m (106 in. lbs.).
15. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
16. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
17. Run the engine until it reaches normal operating temperature.

Scheme 272

Scheme 273

1. Disconnect and isolate the negative battery cable.
2. Remove the oil pan. Refer to «PAN, OIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Remove the bolt (3) from the oil pump pick-up tube support bracket.
4. Remove the bolt (2) from the oil pick-up tube and remove the oil pick-up tube (1) from the oil pump.
5. Remove and discard the O-ring seal (1) from the oil pick-up tube.

INSTALLATION - OIL PUMP PICK-UP

1. Lightly lubricate the new O-ring seal (1) with engine oil and install on the oil pick-up tube.
2. Install the oil pick-up tube (1) with two bolts (2 and 3). Tighten the bolts to 12 N.m (106 in. lbs.).
3. Install the oil pan. Refer to «PAN, OIL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
6. Run the engine until it reaches normal operating temperature.

Scheme 274

The vane type engine oil pump is mounted to the underside of the cylinder block and is driven by the oil pump chain off the crankshaft at a 1:1 drive ratio. This pump location improves efficiency compared to an on-crankshaft location. The pump is driven with a silent chain which is tensioned using a spring loaded tensioner. The pump is not timed to the engine.

An internal mechanical ball and spring type relief valve prevents excess pressure in the engine by dumping oil into the sump and provides emergency protection at conditions such as a cold start with high engine speed.

The pump has a moving slide mechanism for variable displacement capability and an on-off solenoid for two-stage pressure regulation. The pump and the solenoid are not to be disassembled. Both are non-serviceable items and are to be replaced as a complete assembly.

Scheme 275

The engine oil pump features seven vanes and a moving element (1) that continuously adjusts to maintain a regulated oil pressure supply by varying the displacement of the pump. The pump has two regulated pressure stages of operation controlled by an on/off solenoid (2). Low pressure mode regulation (solenoid on) is approximately 200 kPa (29 psi) and high pressure mode regulation (solenoid off) is approximately 450 kPa (65 psi). The Powertrain Control Module (PCM) switches the pump between stages based on engine operating conditions, oil and coolant temperatures, speed and load. Under most typical conditions, the pump will run in low mode from idle up to around 3000 rpm, and switch from low to high mode between 3000 and 4000 rpm.

The maximum oil pressure in the engine is limited to 1000 kPa (145 psi) by the relief valve (3). Pressure in the main oil gallery of the engine can be monitored with diagnostic equipment through the oil pressure sensor mounted on the rear of the oil filter module. The minimum pressure for the engine is 41 kPa (6 psi) at any operating condition. Anything under this pressure could result in damage to critical moving parts.

Scheme 276

In high pressure mode regulation (solenoid off) main gallery oil pressure (2) is applied to the moving element (1). The main gallery oil pressure works against spring pressure (3) to move the element to a more concentric location about the pump driveshaft (4) thus reducing displacement and pump output.

Scheme 277

In low pressure mode regulation (solenoid on) the energized solenoid opens an additional chamber (1) to main gallery oil pressure increasing the force on the spring (2) to further reduce displacement and output pressure.

Scheme 278

Scheme 279

Scheme 280

Scheme 281

Scheme 282

Scheme 283

Scheme 284

1. Disconnect and isolate the negative battery cable.
2. Remove the upper oil pan. Refer to «PAN, OIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Remove the oil pump pick-up (1). Refer to «PICK-UP, OIL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Disconnect the engine wire harness from the oil pump solenoid electrical connector (1).
5. Depress the connector retention lock tab (1) to disengage the oil pump solenoid electrical connector from the engine block. NOTE: Graphic shows the engine timing cover removed for clarity.
6. Push the oil pump solenoid electrical connector into the engine block, rotate the connector slightly CW, push it past the primary chain tensioner mounting bolt (1) and into the engine.
7. Push back the oil pump chain tensioner (2) and insert a suitable retaining pin (1) such as a 3 mm Allen wrench. CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
8. Mark the direction of rotation on the oil pump chain (3) and sprocket (4) using a paint pen or equivalent to aid in reassembly. NOTE: There are no timing marks on the oil pump gear or chain. Timing of the oil pump is not required.
9. Remove the oil pump sprocket T45 retaining bolt (2) and remove the oil pump sprocket (4).
10. Remove the retaining pin (3) and disengage the oil pump chain tensioner spring (1) from the dowel pin (2).
11. Remove the oil pump chain tensioner from the oil pump.
12. Remove the four oil pump bolts (1) and remove the oil pump (3).

Scheme 285

Note. The 3.6L Oil pump is released as an assembly. The assembly includes both the pump and the solenoid. There are no serviceable sub-assembly components. In the event the oil pump or solenoid are not functioning or out of specification they must be replaced as an assembly.

1. Inspect the solenoid wires (1) for cuts or chaffing.
2. Inspect the condition of the connector O-ring seal (3).
3. Inspect the connector retention lock tab (2) for fatigue or damage.

INSTALLATION - ENGINE OIL PUMP

1. Align the locator pins (2) to the engine block and install the oil pump (3) with four bolts (1). Tighten the bolts to 12 N.m (106 in. lbs.).
2. Install the oil pump chain tensioner on the oil pump.
3. Position the oil pump chain tensioner spring (1) above the dowel pin (2).
4. Push back the oil pump chain tensioner and insert a suitable retaining pin (3) such as a 3 mm Allen wrench. NOTE: There are no timing marks on the oil pump gear or chain. Timing of the oil pump is not required. CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
5. Place the oil pump sprocket (4) into the oil pump chain (3). Align the oil pump sprocket with the oil pump shaft and install the sprocket. Install the T45 retaining bolt (2) and tighten to 25 N.m (18 ft. lbs.).
6. Remove the retaining pin (1). Verify that the oil pump chain is centered on the tensioner and crankshaft sprocket.
7. Rotate the crankshaft CW one complete revolution to verify proper oil pump chain installation. NOTE: Graphic shows the engine timing cover removed for clarity.
8. Position the oil pump solenoid electrical connector (2) into the engine block. Rotate the connector so that it can be pushed past the primary chain tensioner mounting bolt (1). Then rotate the connector slightly CCW and push it into the engine block until it locks in place.
9. Verify that the oil pump solenoid electrical connector retention lock tab (1) is engaged to the engine block.
10. Connect the engine wire harness to the oil pump solenoid electrical connector (1).
11. Install the oil pump pick-up (1). Refer to «PICK-UP, OIL PUMP, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
12. Install the oil pan. Refer to «PAN, OIL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
13. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
14. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.). CAUTION: A MIL or low oil pressure indicator that remains illuminated for more than 2 seconds may indicate low or no engine oil pressure. Stop the engine and investigate the cause of the indication.
15. Start and run the engine until it reaches normal operating temperature.

Scheme 286

The 3.6 liter engine has three engine blocked-mounted oil jets (1) installed to cool the underside of each piston. The oil jets are fed by the main oil gallery, and spray upward on the bottom of the pistons and cylinder walls. Each set of jets has a check valve which closes below 2.5 bar (35 psi) to maintain ample oil pressure at idle. All three sets of oil jets are identical and seal to the engine block using an o-ring and fastener.

Scheme 287

Note. Piston oil cooler jet for cylinders one/two shown in illustration. Piston oil cooler jets for cylinders three/four and five/six are similar.

Scheme 288

1. Remove the crankshaft. Refer to «CRANKSHAFT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. Remove the bolt (1) and the piston oil cooler jet(s) (2) from the engine block.
3. Remove and discard the O-ring seal (1) from the piston oil cooler jet(s).

1. Lubricate a new O-ring seal (1) with engine oil and install on the piston oil cooler jet(s). NOTE: Piston oil cooler jet for cylinders one/two shown in illustration. Piston oil cooler jets for cylinders three/four and five/six are similar.
2. Install the piston oil cooler jet(s) (2) into the engine block and tighten the retaining bolt (1) to 6 N.m (53 in. lbs.).
3. Install the crankshaft. Refer to «CRANKSHAFT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
5. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
6. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
7. Run the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

The oil pressure sensor (2) is located on the oil filter housing (3). The oil pressure sensor is a three wire sensor with a tapered threaded sensor port. The sensor port is mounted to the oil filter housing through an access hole. A thread lock patch seals the oil pressure sensor to the oil filter housing.

Scheme 289

The oil pressure sensor is a silicon based sensing unit that measures the pressure of the engine oil. The Powertrain Control Module (PCM) supplies a 5 volt reference and a ground to the sensor. The input to the PCM occurs on the signal return circuit. The oil pressure sensor is a linear sensor; as pressure changes, voltage changes proportionately and returns a voltage signal to the PCM that reflects oil pressure. The zero pressure reading is 0.5 volt and full scale is 4.5 volt.

Scheme 290

1. Release fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELEASE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
2. Disconnect and isolate the negative battery cable.
3. Remove the air inlet hose, upper intake manifold and lower intake manifold with the fuel injectors and fuel rail (2). Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Disconnect the oil pressure sensor electrical connector (4).
5. Remove the oil pressure sensor (2) from the oil filter housing (3).

1. Install the oil pressure sensor (2) and tighten to 20 N.m (177 in. lbs.).
2. Connect the oil pressure sensor electrical connector (3).
3. Install the upper and lower intake manifolds and air cleaner housing assembly. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

The oil temperature sensor (1) is located on the oil filter housing (3). The oil temperature sensor is a two wire sensor with a tapered threaded sensor probe. The sensor probe is mounted to the oil filter housing through an access hole. A thread lock patch seals the oil temperature sensor to the oil filter housing.

Scheme 291

The oil temperature sensor is a variable resistor that measures the temperature of the engine oil. The Powertrain Control Module (PCM) supplies a 5 volt reference and a ground to the sensors low reference signal circuit. When the oil temperature is low, the sensor resistance is high. When the oil temperature is high, the sensor resistance is low.

1. Release fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELEASE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
2. Disconnect and isolate the negative battery cable.
3. Remove the air inlet hose, upper intake manifold and lower intake manifold with the fuel injectors and fuel rail (2). Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Disconnect the oil temperature sensor electrical connector (5).
5. Remove the oil temperature sensor (1) from the oil filter housing (3).

Install the oil temperature sensor (1) and tighten to 20 N.m (177 in. lbs.).

1. Connect the oil temperature sensor electrical connector (4).
2. Install the upper and lower intake manifolds and air cleaner housing assembly. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Scheme 292

The upper intake manifold is an injection molded nylon composite design. The upper intake manifold is sealed to the lower intake manifold using six individual press-in-place port silicone gaskets. Replace the gaskets whenever the upper intake manifold is removed from the engine. There is a silencer pad positioned between the upper and lower intake manifolds for improved noise, vibration and harshness (NVH). The left cylinder head cover has two alignment posts to aid proper installation of the silencer pad. The seven upper intake manifold fasteners thread directly into the composite lower intake manifold and are a self-taping design. If the upper intake manifold is damaged or cracked, it must be replaced.

The Electronic Throttle Control (ETC) and Manifold Air Pressure (MAP) sensor are attached directly to the upper intake manifold. The upper intake manifold also provides vacuum ports for brake booster, positive crankcase ventilation (PCV) and emissions control.

Scheme 293

The lower intake manifold is an injection molded nylon composite design. The lower intake manifold is sealed to the cylinder heads using six individual press-in-place port silicone gaskets. Replace the gaskets whenever the lower intake manifold is removed from the engine. The seven upper intake manifold fasteners thread directly into the composite lower intake manifold and are a self-taping design.

The fuel injection fuel rail is also a composite design. The four fuel rail fasteners thread directly into the composite lower intake manifold and are a self-taping design. The lower intake manifold can be serviced without removing the fuel injector rail. The fuel rail and fuel injectors must be installed into the lower intake manifold as an assembly. Do not attempt to install the fuel rail when the injectors are in the manifold. Always install new O-rings on the fuel injectors.

If the lower intake manifold is damaged or cracked, it must be replaced.

DIAGNOSIS AND TESTING - INTAKE MANIFOLD LEAKS

An intake manifold air leak is characterized by lower than normal manifold vacuum. Also, one or more cylinders may not be functioning.

1. Start the engine.
2. Spray a small stream of water (spray bottle) at the suspected leak area.
3. If engine RPM'S change, the area of the suspected leak has been found.
4. Repair as required.

Scheme 294

Scheme 295

Scheme 296

1. Disconnect and isolate the negative battery cable.
2. Remove the engine cover (1).
3. Disconnect the electrical connector (2) from the Inlet Air Temperature (IAT) sensor.
4. Loosen the clamp (1) at the throttle body.
5. Loosen the clamp (4) at the air cleaner body.
6. Remove the air inlet hose (3).
7. Disengage the brake booster hose retainer (1) from the upper intake manifold.
8. Disconnect the electrical connectors from the Manifold Absolute Pressure (MAP) sensor (2) and the Electronic Throttle Control (ETC) (4).
9. Disengage the ETC harness from the clip (5) on the throttle body. Disengage the wire harness retainer (1) from the upper intake manifold near the MAP sensor and reposition the wire harness.
10. Disconnect the following hoses from the upper intake manifold: Positive Crankcase Ventilation (PCV) (7) vapor purge (3) brake booster (6)
11. Disengage the wire harness retainer (4) from the studbolt (3).
12. Remove two nuts (1), loosen the studbolt (3) and reposition the upper intake manifold support bracket (2).
13. Remove the nut (2) from the support bracket of the heater core return tube (3).
14. Remove two nuts (1), loosen two studbolts (3) and reposition the two upper intake manifold support brackets (2). NOTE: The upper intake manifold attaching bolts are captured in the upper intake manifold. Once loosened, the bolts will have to be lifted out of the lower intake manifold and held while removing the upper intake manifold. NOTE: Exercise care not to inadvertently loosen the two fuel rail attachment bolts that are in close proximity of the upper intake manifold attaching bolts.
15. Remove seven upper intake manifold attaching bolts (1) and remove the upper intake manifold (2).
16. Remove and discard the six upper to lower intake manifold seals (1).
17. Cover the open intake ports to prevent debris from entering the engine.
18. If required, remove the insulator (2) from the LH cylinder head cover.

REMOVAL - LOWER INTAKE MANIFOLD

Scheme 297

Scheme 298

Scheme 299

Scheme 300

1. Release fuel system pressure. Refer to «FUEL SYSTEM PRESSURE RELEASE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
2. Disconnect and isolate the negative battery cable.
3. Remove the air inlet hose and upper intake manifold (2). Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Remove the insulator (2) from the LH cylinder head cover.
5. Disconnect the fuel supply hose (1) from the fuel rail. Refer to «STANDARD PROCEDURE - QUICK-CONNECT FITTINGS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
6. Disconnect the fuel injector electrical connectors (2).
7. Disengage the injection/ignition harness retainer (1) form the rear of the lower intake manifold.
8. Disengage the main wire harness retainer (2) form the rear of the lower intake manifold.
9. Remove the eight lower intake manifold attaching bolts (1).
10. Remove the lower intake manifold (2) with the fuel injectors and fuel rail.
11. Remove and discard the six lower intake manifold to cylinder head seals (1).
12. If required, remove the fuel rail (2) and fuel injectors from the lower intake manifold. Refer to «RAIL, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .

Scheme 301

Note. When the upper intake manifold (3) and lower intake manifold (1) are not aligned properly, cross threading of the upper intake manifold attaching bolts can occur. The graphic shows non-repairable damage to the lower intake manifold (1) due to cross threading of an upper intake manifold attaching bolt (2).

Check both the upper and lower intake manifolds for

1. Damage and cracks
2. Gasket surface damage or warping

Check the lower intake manifold for

1. Damaged fuel injector ports

If either the upper or lower manifold exhibits any damaged or warped conditions, replace the manifold.

Scheme 302

Note. Prior to installing the upper intake manifold, verify that the four fuel rail bolts were not inadvertently loosened. The bolts must tightened in the sequence shown in illustration to 7 N.m (62 in. lbs.). Refer to RAIL, FUEL, INSTALLATION .

Scheme 303

1. Clean and inspect the sealing surfaces. Install new upper to lower intake manifold seals (1). NOTE: Make sure the fuel injectors and wiring harnesses are in the correct position so that they don't interfere with the upper intake manifold installation.
2. If removed, install the insulator (2) to the two alignment posts (3) on top of the LH cylinder head cover.
3. Lift and hold the seven upper intake attaching bolts (1) clear of the mating surface. Back the bolts out slightly or if required, use an elastic band to hold the bolts clear of the mating surface.
4. Position the upper intake manifold (1) onto the lower intake manifold so that the two locating posts (2) on the upper intake manifold align with corresponding holes (3) in the lower intake manifold.
5. Install the seven upper intake manifold attaching bolts. Tighten the bolts in the sequence shown in illustration to 8 N.m (71 in. lbs.).
6. Install two nuts (1) to the upper intake manifold support bracket (2). Tighten the nuts (1) to 10 N.m (89 in. lbs.) and tighten the studbolt (3) to 20 N.m (177 in. lbs.)
7. Engage the wire harness retainer (4) to the studbolt (3).
8. Install two upper intake manifold support brackets (2) with two studbolts (3) and two nuts (1). Tighten the studbolts (3) to 20 N.m (177 in. lbs.) and tighten the nuts (1) to 10 N.m (89 in. lbs.).
9. Install the nut (2) to the support bracket of the heater core return tube (3) and tighten to 12 N.m (106 in. lbs.).
10. Connect the following hoses to the upper intake manifold: Positive Crankcase Ventilation (PCV) (7) vapor purge (3) brake booster (6)
11. Connect the electrical connectors to the Manifold Absolute Pressure (MAP) sensor (2) and the Electronic Throttle Control (ETC) (4).
12. Secure the ETC harness to the clip (5) on the throttle body and engage the wire harness retainer (1) to the upper intake manifold near the MAP sensor.
13. Engage the brake booster hose retainer (1) to the upper intake manifold.
14. Install the air inlet hose (3) to the air cleaner body and the throttle body. Tighten the clamps (1) and (4) to 4 N.m (35 in. lbs.).
15. Connect the electrical connector (2) to the Inlet Air Temperature (IAT) sensor.
16. Install the engine cover (1).
17. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).

Scheme 304

1. Clean and inspect the sealing surfaces. Install new lower intake manifold to cylinder head seals (1).
2. If removed, install the fuel injectors and the fuel rail (1) to the lower intake manifold. Tighten the four bolts in the sequence shown in illustration to 7 N.m (62 in. lbs.). Refer to «RAIL, FUEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
3. Position the lower intake manifold (1) on the cylinder head surfaces.
4. Install the manifold attaching bolts and tighten in the sequence shown in illustration to 8 N.m (71 in. lbs.).
5. Engage the main wire harness retainer (2) to the rear of the lower intake manifold.
6. Engage the injection/ignition harness retainer (1) to the rear of the lower intake manifold.
7. Connect the fuel injector electrical connectors (2).
8. Connect the fuel supply hose to the fuel rail (1). Refer to «STANDARD PROCEDURE - QUICK-CONNECT FITTINGS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
9. Install the insulator (2) to the two alignment posts (3) on top of the LH cylinder head cover.
10. Install the upper intake manifold (1), support brackets and air inlet hose. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
11. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
12. Start the engine and check for leaks.

The 3.6L aluminum cylinder heads are a unique design with left and right castings. The exhaust manifolds are integrated into the cylinder heads. If any damaged is found to the exhaust manifold portion, the cylinder head must be removed for repair or replacement. Refer to CYLINDER HEAD, REMOVAL .

Scheme 305

The timing drive uses four silent chains. The silent chain link design improves sprocket engagement and reduces noise, vibration and harshness (NVH). One chain (5) drives the oil pump (4) and three chains drive the camshafts in a two stage design. The left secondary camshaft chain (1) uses an oil pressure controlled chain tensioner (9) with a ratcheting device. The right secondary camshaft chain (8) uses an oil pressure controlled tensioner (7) without a ratchet. The primary chain (2) also uses an oil pressure controlled tensioner (6) without a ratchet. A spring loaded tensioner (3) takes up the slack in the oil pump chain (5). The chain guides and tensioner arms are made of glass filled nylon with nylon wear faces.

Scheme 306

The primary timing chain is a silent type. The primary chain drives the 28 tooth idler sprocket directly from a 21 tooth crankshaft sprocket. This results in a 75% speed reduction to the idler sprocket. The idler sprocket assembly connects the primary chain drive and the secondary chain drive. The idler sprocket assembly consists of two integral 22 tooth sprockets a 28 tooth sprocket. The idler sprocket assembly spins on a stationary idler shaft. The idler shaft is a light press-fit into the cylinder block. A large washer on the idler shaft bolt and the rear flange of the idler shaft are used to control sprocket thrust movement. Pressurized oil is routed through the center of the idler shaft to provide lubrication for the bushings used in the idler sprocket assembly. Primary chain motion is controlled by a hydraulic oil damped tensioner and a fixed guide. The tensioner and the guide both use nylon plastic wear faces for low friction and long wear. The primary chain receives oil splash lubrication.

Scheme 307

There are two identical secondary drive chains, both are silent type, one to drive the camshafts in each double overhead cam (DOHC) cylinder head. The secondary chains drive the 33 tooth camshaft sprockets directly from the 22 tooth idler sprockets. This speed reduction combined with the crankshaft to idler sprocket speed reduction produces the required 2:1 camshaft drive ratio. A fixed chain guide and a hydraulic oil damped tensioner are used to maintain tension in each secondary chain system. The left hydraulic secondary chain tensioner is fed from the main oil gallery through the cylinder head. The right hydraulic secondary chain tensioner is fed from the number one main bearing journal. Each tensioner incorporates a controlled leak path through a device known as a vent disc located in the nose of the piston to manage chain loads. Only the left tensioner has a mechanical ratchet system that limits chain slack if the tensioner piston bleeds down after engine shut down. The tensioner arms and guides also utilize nylon wear faces for low friction and long wear. The two secondary timing chains are lubricated by holes in the oil controlled tensioners that spray oil through an opening in the tensioner arms. The holes are protected from clogging by a fine mesh screen which is located on the back of the hydraulic tensioners.

Scheme 308

The left side cam chain tensioner used on the 3.6L engine is equipped with a ratchet. The ratchet consists of a rack (2) and a pawl (1). In use, the rack (2) extends with the piston (3) from the tensioner body. The pawl (1) will not allow the rack (2) to retract back into the tensioner body. In order to reset the tensioner, the pawl (1) must be disengaged from the rack (2) so that the piston (3) and rack (2) can be pushed back (4) into the tensioner body.

Scheme 309

Note. The slot (2) in the rack provides an anchor point for a pin that holds the rack in the retracted position.

Scheme 310

1. Using a suitable tool, such as an allen wrench (1), lift the pawl off of the rack.
2. While holding the pawl off of the rack, push the rack and the piston into the tensioner body.
3. When the slot is aligned with the hole in the tensioner body, insert Tensioner Pin (special tool #8514, Pins, Tensioner) (1) to hold the rack and piston in the retracted position.

WITH ENGINE TIMING COVER INSTALLED

Note. Graphic shows timing cover removed for clarity.

Scheme 311

1. Using (special tool #10200-3, Pin) (2), lift the pawl off of the rack (3).
2. While holding the pawl off of the rack, push (special tool #10200-1, Holder, Timing Chain, Left Side) (1) into place between the cylinder head and the cam chain guide to force the rack and piston back into the tensioner body. The holder must remain in place during service to keep the rack and piston in the retracted position.

MEASURING TIMING CHAIN WEAR

1. Remove the engine timing chain cover. Refer to «COVER(S), ENGINE TIMING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. To determine if the timing chains are worn, rotate the crankshaft clockwise until maximum tensioner piston extension (1) is obtained on the RH cam chain tensioner (2). Measure the distance between the secondary timing chain tensioner housing and the step ledge on the tensioner piston (1). Piston extension (1) must be less than 16 mm (0.630 in.).
3. Piston extension greater than 16 mm (0.630 in.) indicates that all timing chains are worn and require replacement. Refer to «CHAIN AND SPROCKETS, TIMING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

ENGINE TIMING VERIFICATION

Correct timing is critical for the NON free-wheeling designed, 3.6L engine. Engine timing can be verified by using the following procedures

Scheme 312

1. Remove the upper intake manifold and both cylinder head covers. Refer to «COVER(S), CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
2. Remove the spark plugs. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) . CAUTION: When aligning timing marks, always rotate engine by turning the crankshaft. Failure to do so will result in valve and/or piston damage.
3. Mount Dial Indicator Set (special tool #C-3339A, Set, Dial Indicator) (1) to a stationary point on the engine, such as the cylinder head cover mounting surface. Position the indicator probe into the number one cylinder, rotate the crankshaft clockwise (as viewed from the front) to place the number one piston at top-dead-center on the exhaust stroke and set the indicator dial to ZERO .
4. While maintaining this alignment, verify that the ARROWS (1) on the left side cam phasers point toward each other and are parallel to the cylinder head cover mounting surface (2) and that the right side cam phaser ARROWS (3) point away from each other and the SCRIBE LINES (5) are parallel to the cylinder head cover mounting surface (4). NOTE: The phaser markings (1 and 3) could align with either an external or internal chain link. Either alignment is acceptable as long as there are twelve chain pins between the markings.
5. There should be twelve chain pins (2) BETWEEN the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3) as viewed from either the front or rear of the cam phasers.
6. If the engine timing is not correct, proceed to Timing Chain and Sprockets for service procedures. Refer to «CHAIN AND SPROCKETS, TIMING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .

Note. The Variable Valve Timing (VVT) assemblies (Phasers) and Oil Control Valves (OCVs) can be serviced without removing the engine timing cover. Refer to ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, REMOVAL .

Scheme 313

Scheme 314

Scheme 315

1. Disconnect and isolate the negative battery cable.
2. Remove the air cleaner housing assembly and upper intake manifold. Refer to «MANIFOLD, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
3. Remove both cylinder head covers. Refer to «COVER(S), CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
4. Remove the spark plugs. Refer to «SPARK PLUG, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
5. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
6. Drain the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
7. Remove the oil pan, accessory drive belts, crankshaft vibration damper and engine timing cover. Refer to «COVER(S), ENGINE TIMING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: Take this opportunity to measure timing chain wear. Refer to «Engine/Valve Timing - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . CAUTION: When aligning timing marks, always rotate engine by turning the crankshaft. Failure to do so will result in valve and/or piston damage.
8. Rotate the crankshaft clockwise (as viewed from the front) to place the number one cylinder piston at top-dead-center on the exhaust stroke by aligning the dimple (4) on the crankshaft with the block/bearing cap junction (5).
9. While maintaining this alignment, verify that the ARROWS (2) on the left side cam phasers point toward each other and are parallel to the cylinder head cover mounting surface (3) and that the right side cam phaser ARROWS (7) point away from each other and the SCRIBE LINES (9) are parallel to the cylinder head cover mounting surface (8). NOTE: The phaser markings (1 and 3) could align with either an external or internal chain link. Either alignment is acceptable as long as there are twelve chain pins between the markings.
10. There should be twelve chain pins (2) BETWEEN the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3) as viewed from either the front or rear of the cam phasers. CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
11. Mark the direction of rotation on the following timing chains using a paint pen or equivalent to aid in reassembly: Left side cam chain Right side cam chain Oil pump chain Primary chain
12. Reset the right side cam chain tensioner by pushing back the tensioner piston and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (1).
13. Reset the left side cam chain tensioner by lifting the pawl (1), pushing back the piston (2) and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (3). Refer to «Engine/Valve Timing - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
14. Disengage the oil pump chain tensioner spring (3) from the dowel pin (2) and remove the oil pump chain tensioner (1).
15. Remove the oil pump sprocket T45 retaining bolt (4) and remove the oil pump sprocket (5) and oil pump chain (6). NOTE: It may be necessary to rock the camshaft slightly (a few degrees) with a wrench (4) when installing the camshaft phaser lock.
16. Install the (special tool #10202-1, Lock, Camshaft/Phaser, Right Side) (1) with the tool number facing up.
17. Loosen, but do not remove, the exhaust oil control valve (3) and the intake oil control valve (2).
18. Remove the (special tool #10202-1, Lock, Camshaft/Phaser, Right Side) (1).
19. Remove the oil control valve (2) from the right side intake cam phaser.
20. Pull the right side intake cam phaser off of the camshaft and remove the right side cam chain.
21. If required, remove the oil control valve (3) and pull the right side exhaust cam phaser off of the camshaft. NOTE: It may be necessary to rock the camshaft slightly (a few degrees) with a wrench (4) when installing the camshaft phaser lock.
22. Install the (special tool #10202-2, Lock, Camshaft/Phaser, Left Side) (1) with the tool number facing up.
23. Loosen, but do not remove, the exhaust oil control valve (2) and the intake oil control valve (3).
24. Remove the (special tool #10202-2, Lock, Camshaft/Phaser, Left Side) (1).
25. Remove the oil control valve (2) from the left side exhaust cam phaser.
26. Pull the left side exhaust cam phaser off of the camshaft and remove the left side cam chain.
27. If required, remove the oil control valve (3) and pull the left side intake cam phaser off of the camshaft.
28. Reset the primary chain tensioner (5) by pushing back the tensioner piston and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (3). Remove two T30 bolts (4) and remove the primary chain tensioner.
29. Remove the T30 bolt (1) and the primary chain guide (2).
30. Remove the idler sprocket T45 retaining bolt (2) and washer (3).
31. Remove the primary chain, idler sprocket and crankshaft sprocket as an assembly.
32. If required, remove two T30 bolts (6) and the left side cam chain tensioner (5).
33. If required, remove two T30 bolts (4) and the left side cam chain guide (2) and tensioner arm (1).
34. If required, remove two T30 bolts (4) and the right side cam chain tensioner (3).
35. If required, remove three T30 bolts (2) and the right side cam chain guide (1) and tensioner arm (6).
36. Inspect all sprockets and chain guides. Replace if damaged.

Prior to disassembly of the timing chains and sprockets, measure the timing chain wear (1). Refer to Engine/Valve Timing - Standard Procedure .

Inspect the following valve timing components

1. Sprockets for excessive tooth wear. Some tooth markings are normal and not a cause for sprocket replacement.
2. Idler sprocket assembly bushing and shaft for excessive wear.
3. Chain guides and tensioner arms. Replace these parts if grooving in plastic face is more than 1 mm (0.039 in.) deep.
4. Secondary chain tensioner piston and ratcheting device. Inspect for evidence of heavy contact between tensioner piston and tensioner arm. If this condition exist the tensioner arm and chain should be replaced.
5. Primary chain tensioner plastic faces. Replace as required.

Scheme 316

Scheme 317

Scheme 318

1. Inspect all sprockets and chain guides. Replace if damaged.
2. If removed, install the right side cam chain guide (1) and tensioner arm (6). Tighten attaching T30 bolts (2) to 12 N.m (106 in. lbs.).
3. If removed, install the right side cam chain tensioner (3) to the engine block with two bolts (4). Tighten the T30 bolts (4) to 12 N.m (106 in. lbs.).
4. Reset the right side cam chain tensioner (3) by pushing back the tensioner piston and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (5).
5. If removed, install the left side cam chain guide (2) and tensioner arm (1). Tighten attaching T30 bolts (4) to 12 N.m (106 in. lbs.).
6. If removed, install the left side cam chain tensioner (5) to the cylinder head with two bolts (6). Tighten the T30 bolts (6) to 12 N.m (106 in. lbs.).
7. Reset the left side cam chain tensioner (5) by lifting the pawl (3), pushing back the piston and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (7). Refer to «Engine/Valve Timing - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
8. Verify that the key (3) is installed in the crankshaft.
9. Verify that the number one cylinder piston is positioned at top-dead-center by aligning the dimple (2) on the crankshaft with the block/bearing cap junction (1).
10. Verify that the camshafts are set at top-dead-center by positioning the alignment holes (1) vertically. CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
11. Place the primary chain onto the crankshaft sprocket (3) so that the arrow (2) is aligned with the plated link (1) on the timing chain.
12. While maintaining this alignment, invert the crankshaft sprocket and timing chain and place the idler sprocket (4) into the timing chain so that the dimple (2) is aligned with the plated link (1) on the timing chain.
13. While maintaining this alignment, lubricate the idler sprocket bushing with clean engine oil and install the sprockets and timing chain on the engine. To verify that the timing is still correct, the timing chain plated link (6) should be located at 12:00 (1) when the dimple (5) on the crankshaft is aligned with the block/bearing cap junction (4).
14. Install the idler sprocket retaining bolt (2) and washer (3). Tighten the T45 bolt (2) to 25 N.m (18 ft. lbs.).
15. Install the primary chain guide (2). Tighten attaching T30 bolt (1) to 12 N.m (106 in. lbs.).
16. Reset the primary chain tensioner (5) by pushing back the tensioner piston and installing Tensioner Pin (special tool #8514, Pins, Tensioner) (3).
17. Install the primary chain tensioner (5) to the engine block with two bolts (4). Tighten the T30 bolts (4) to 12 N.m (106 in. lbs.) and remove the Tensioner Pin (special tool #8514, Pins, Tensioner) (3).
18. Press the left side intake cam phaser onto the intake camshaft. Install and hand tighten the oil control valve (6). NOTE: The left side and right side cam chains are identical. CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
19. Drape the left side cam chain over the left side intake cam phaser and onto the idler sprocket (1) so that the arrow (3) is aligned with the plated link (2) on the cam chain.
20. While maintaining this alignment, route the cam chain around the exhaust and intake cam phasers so that the plated links are aligned with the phaser timing marks (1). Position the left side cam phasers so that the arrows (3) point toward each other and are parallel to the cylinder head cover mounting surface (5). Press the exhaust cam phaser onto the exhaust cam, install and hand tighten the oil control valve (2). NOTE: Minor rotation of a camshaft (a few degrees) may be required to install the camshaft phaser or phaser lock.
21. Install the (special tool #10202-2, Lock, Camshaft/Phaser, Left Side) (4) with the tool number facing up.
22. Tighten the oil control valves (2) and (6) to 150 N.m (110 ft. lbs.).
23. Remove the Camshaft Phaser Lock (4).
24. Press the right side exhaust cam phaser onto the exhaust camshaft. Install and hand tighten the oil control valve (7). CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
25. Drape the right side cam chain over the right side exhaust cam phaser and onto the idler sprocket (1) so that the dimple (2) is aligned with the plated link (3) on the cam chain.
26. While maintaining this alignment, route the cam chain around the exhaust and intake cam phasers so that the plated links are aligned with the phaser timing marks (1). Position the right side cam phasers so that the arrows (3) point away from each other and the scribe lines (4) are parallel to the cylinder head cover mounting surface (6). Press the intake cam phaser onto the intake cam, install and hand tighten the oil control valve (2). NOTE: Minor rotation of a camshaft (a few degrees) may be required to install the camshaft phaser or phaser lock.
27. Install the (special tool #10202-1, Lock, Camshaft/Phaser, Right Side) (5) with the tool number facing up.
28. Tighten the oil control valves (2) and (7) to 150 N.m (110 ft. lbs.).
29. Remove the Camshaft Phaser Lock (5). NOTE: There are no timing marks on the oil pump gear or chain. CAUTION: Always reinstall timing chains so that they maintain the same direction of rotation. Inverting a previously run chain on a previously run sprocket will result in excessive wear to both the chain and sprocket.
30. Place the oil pump sprocket (5) into the oil pump chain (6). Place the oil pump chain onto the crankshaft sprocket while aligning the oil pump sprocket with the oil pump shaft. Install the oil pump sprocket T45 retaining bolt (4) and tighten to 25 N.m (18 ft. lbs.).
31. Install the oil pump chain tensioner (1). Insure that the spring (3) is positioned above the dowel pin (2).
32. Remove the Tensioner Pins (special tool #8514, Pins, Tensioner) (1) and (6) from the right side and left side cam chain tensioners.
33. Rotate the crankshaft clockwise (as viewed from the front) two complete revolutions stopping when the dimple (4) on the crankshaft is aligned with the block/bearing cap junction (5).
34. While maintaining this alignment, verify that the ARROWS (2) on the left side cam phasers point toward each other and are parallel to the cylinder head cover mounting surface (3) and that the right side cam phaser ARROWS (7) point away from each other and the SCRIBE LINES (9) are parallel to the cylinder head cover mounting surface (8).
35. There should be 12 chain pins (2) BETWEEN the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3) as viewed from either the front or rear of the cam phasers.
36. If the engine timing is not correct, repeat this procedure.
37. Install the engine timing cover, crankshaft vibration damper, accessory drive belts and oil pan. Refer to «COVER(S), ENGINE TIMING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
38. Install the spark plugs. Tighten to 17.5 N.m (13 ft. lbs.). Refer to «SPARK PLUG, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) .
39. Install the cylinder head covers. Refer to «COVER(S), CYLINDER HEAD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
40. Install the upper intake manifold and air cleaner housing assembly. Refer to «MANIFOLD, INTAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
41. Fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
42. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
43. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
44. Operate the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

Note. The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.

Scheme 319

Scheme 320

Scheme 321

Scheme 322

Scheme 323

Scheme 324

Scheme 325

Scheme 326

1. Disconnect and isolate the negative battery cable.
2. Drain the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
3. Remove the electric vacuum pump. Refer to «PUMP, ELECTRIC VACUUM, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information__removal) .
4. Remove the upper radiator hose (2) and thermostat housing (1). Refer to «THERMOSTAT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
5. Remove the heater core return hose (1) from the water pump housing.
6. Remove the lower radiator hose (2) from the water pump housing.
7. Remove the heater core supply hose (1) from the coolant outlet housing (2).
8. Remove the bolt (2) and reposition the heater core supply tube (1).
9. Remove the accessory drive belt (4). Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
10. Remove the accessory drive belt tensioner (7). Refer to «TENSIONER, BELT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
11. Remove the accessory idler pulley (1). Refer to «PULLEY, IDLER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
12. Remove the power steering pump pulley (5). Refer to «PULLEY, POWER STEERING PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/manual-power-steering/#steering-system) .
13. Remove the crankshaft vibration damper (6). Refer to «DAMPER, VIBRATION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
14. Remove the right and left cylinder head covers. Refer to «COVER(S), CYLINDER HEAD, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
15. Remove the upper and lower oil pans. Refer to «PAN, OIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . NOTE: It is not necessary to remove the water pump or the coolant outlet housing for engine timing cover removal.
16. Remove the following timing cover attaching bolts: Three M10 bolts (1) One M8 bolt (2) Twenty-three M6 bolts (3)
17. Using the seven indicated pry points, carefully remove the timing cover.
18. If required, remove the remaining four M6 bolts (2) and the coolant outlet housing (1) from the engine timing cover.
19. If required, remove the remaining four M6 bolts (4) and the water pump (3) from the engine timing cover. CAUTION: Do not use oil based liquids, wire brushes, abrasive wheels or metal scrapers to clean the engine gasket surfaces. Use only isopropyl (rubbing) alcohol, along with plastic or wooden scrapers. Improper gasket surface preparation may result in engine fluid leakage.
20. Remove all residual sealant from the timing chain cover, cylinder head and engine block mating surfaces. Refer to «Engine - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
21. Remove and discard the coolant outlet housing gasket (1) and the water pump gasket (2).

INSTALLATION - ENGINE TIMING COVER

1. If removed, install the coolant outlet housing (1) to the timing cover with a new gasket using only the four bolts (2) shown in illustration tightened to 12 N.m (106 in. lbs.).
2. If removed, install the water pump (3) to the timing cover using only the four bolts (4) shown in illustration tightened to 12 N.m (106 in. lbs.). Refer to «PUMP, WATER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
3. Install the coolant outlet housing gasket (1) and the water pump gasket (2).
4. Clean the engine timing cover, cylinder head and block mating surfaces with isopropyl alcohol in preparation for sealant application. CAUTION: Engine assembly requires the use of a unique sealant that is compatible with engine oil. Using a sealant other than Mopar® Threebond Engine RTV Sealant may result in engine fluid leakage. CAUTION: Following the application of Mopar® Threebond Engine RTV Sealant to the gasket surfaces, the components must be assembled within 20 minutes and the attaching fasteners must be tightened to specification within 45 minutes. Prolonged exposure to the air prior to assembly may result in engine fluid leakage.
5. Apply a 2 to 3 mm wide bead of Mopar® Threebond Engine RTV Sealant to the front cover as shown in illustration in the following locations: Three cylinder head bosses (1) Right and left flanges (2) Four cylinder head to engine block T-joints (3) Cover to right cam chain tensioner gap (4)
6. Align the locator pins (4) on the engine block to the engine timing cover and install the cover.
7. Install and tighten the timing cover attaching bolts: Twenty-three M6 bolts (3) to 12 N.m (106 in. lbs.). One M8 bolt (2) to 25 N.m (18 ft. lbs.). Three M10 bolts (1) to 55 N.m (41 ft. lbs.)
8. Install the upper and lower oil pans. Refer to «PAN, OIL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
9. Install the right and left cylinder head covers. Refer to «COVER(S), CYLINDER HEAD, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
10. Install the crankshaft vibration damper (6). Refer to «DAMPER, VIBRATION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
11. Install the power steering pump pulley (5). Refer to «PULLEY, POWER STEERING PUMP, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/manual-power-steering/#steering-system) .
12. Install the accessory idler pulley (1). Refer to «PULLEY, IDLER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
13. Install accessory drive belt tensioner (7). Refer to «TENSIONER, BELT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
14. Install the accessory drive belt (4). Refer to «BELT, SERPENTINE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__removal) .
15. Install the heater core supply tube (1) with one bolt (2) tightened to 12 N.m (106 in. lbs.).
16. Install the heater core supply hose (1) to the coolant outlet housing (2).
17. Install the lower radiator hose (2) to the water pump housing.
18. Install the heater core return hose (1) to the water pump housing.
19. Install the thermostat housing (1) and upper radiator hose (2). Refer to «THERMOSTAT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
20. Install the electric vacuum pump. Refer to «PUMP, ELECTRIC VACUUM, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information__installation) .
21. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to «Engine/Lubrication/OIL - Standard Procedure»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) .
22. Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
23. Fill the cooling system. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .
24. Run the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) .

See also:
• FUEL SYSTEM
• BATTERY, AGM, DIAGNOSIS AND TESTING
• CLEANING
• DIAGNOSIS AND TESTING
• COIL, IGNITION, REMOVAL
• HOOD, REMOVAL
• PUMP, ELECTRIC VACUUM, REMOVAL
• JACKING AND HOISTING LIFT POINTS
• UNDER BODY PROTECTION
• STANDARD PROCEDURE
• BELT, SERPENTINE, REMOVAL
• GENERATOR, REMOVAL
• REMOVAL
• INSTALLATION
• BELT, SERPENTINE, INSTALLATION
• PUMP, ELECTRIC VACUUM, INSTALLATION
• VALVE, POSITIVE CRANKCASE VENTILATION (PCV), 3.6L, REMOVAL
• LINE, A/C SUCTION, REMOVAL
• SEAL, FILL TUBE, REMOVAL
• REMOVAL
• INSTALLATION
• REMOVAL
• REMOVAL
• CAPACITIES AND RECOMMENDED FLUIDS, SPECIFICATIONS
• GEAR, REMOVAL
• ENGINE PERFORMANCE DIAGNOSTIC TABLE
• ENGINE MECHANICAL DIAGNOSTIC TABLE
• CYLINDER COMPRESSION PRESSURE LEAKAGE
• CYLINDER COMBUSTION PRESSURE LEAKAGE
• CYLINDER HEAD GASKET
• DIAGNOSIS AND TESTING - INTAKE MANIFOLD LEAKS
• Engine/Valve Timing - Standard Procedure
• CYLINDER-TO-CYLINDER LEAKAGE TEST
• Engine - Specifications
• REMOVAL
• INSTALLATION
• REAR SEAL AREA LEAKS
• ENGINE LUBRICATION DIAGNOSTIC TABLE
• AIR LEAK DETECTION TEST METHOD