Engine Mechanical: Diagnosis Nissan Quest III

Precautions for Inspection, Repair and Replacement

1. Before repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way, and replace if necessary.

Use the Chart Below to Help You Find the Cause of the Symptom.

1. Locate the area where noise occurs.
2. Confirm the type of noise.
3. Specify the operating condition of engine.
4. Check specified noise source. Repair or replace the identified part as necessary.

NOISE REFERENCE

INSPECTION AFTER REMOVAL

Surface Distortion

Using straightedge and feeler gauge, inspect the surface distortion of both the intake manifold and the intake manifold collector (lower).

Limit : 0.1 mm (0.004 in)

Scheme 11

Scheme 12

Clean oil strainer if any object is attached.

INSPECTION AFTER INSTALLATION

1. Start the engine and check for leaks. Refer to " «CHANGING ENGINE OIL»(ref-239943-S03623837022006080300000) ".
2. Inspect the engine oil level. Refer to " «CHANGING ENGINE OIL»(ref-239943-S03623837022006080300000) ".

Scheme 13

Scheme 14

1. Remove the engine cover using power tool.
2. Drain engine coolant. Refer to " «DRAINING ENGINE COOLANT»(ref-239944-S37417993932006080300000) ".
3. Disconnect the mass air flow sensor electrical connector and remove the air cleaner case (upper), mass air flow sensor and air cleaner to electric throttle control actuator tube. Refer to " «REMOVAL AND INSTALLATION»(ref-239942-S12459786952006080400000) ".
4. Remove the intake manifold collector (upper), gasket, and electric throttle control actuator. Refer to " «REMOVAL AND INSTALLATION»(ref-239942-S36735307182006080400000) ".
5. Remove the six ignition coils. CAUTION: Do not shock it.

Make sure there are no fuel leaks at connections as follows

1. Apply fuel pressure to fuel lines by turning ignition switch ON (with engine stopped). Then check for fuel leaks at connections.
2. Start the engine and rev it up and check for fuel leaks at connections. CAUTION: Do not touch engine immediately after stopping as engine is extremely hot. NOTE: Use mirrors for checking on connections out of the direct line of sight.

Inspection

Check for cracks and any excessive wear at the roller links of the timing chain. Replace the timing chain as necessary.

Scheme 15

INSPECTION OF CAMSHAFT SPROCKET (INT) OIL GROOVE

Scheme 16

1. Check the engine oil level. Refer to " «ENGINE OIL»(ref-239949-S01001184902006080300000) ".
2. Perform the following procedure so as to prevent the engine from being unintentionally started while checking. Release fuel pressure. Refer to " «FUEL PRESSURE RELEASE»(ref-239940-S12688458762006080300000) ". Disconnect ignition coil and injector harness connectors.
3. Remove intake valve timing control solenoid valve. Refer to " «CAMSHAFT»(ref-239942-S38472079942006080400000) ".
4. Crank the engine, and then make sure that engine oil comes out from camshaft bracket (No. 1) oil hole. End crank after checking. WARNING: Be careful not to touch rotating parts (drive belts, idler pulley, and crankshaft pulley, etc.). CAUTION: Engine oil may squirt from intake valve timing control solenoid valve installation hole during cranking. Use a shop cloth to prevent the engine components and the vehicle. Do not allow engine oil to get on rubber components such as drive belt or engine mount insulators. Immediately wipe off any splashed engine oil. Clean oil groove between oil strainer and intake valve timing control solenoid valve if engine oil does not come out from camshaft bracket (No. 1) oil hole. Refer to " «LUBRICATION SYSTEM»(ref-239949-S39966734932006080300000) ".
5. Remove components between intake valve timing control solenoid valve and camshaft sprocket (INT), and then check each oil groove for clogging. Clean oil groove if necessary. Refer to " «LUBRICATION SYSTEM»(ref-239949-S39966734932006080300000) ".
6. After inspection, install removed parts.

1. Before starting engine, check the levels of engine coolant, engine oil and working fluid. If less than required quantity, fill to the specified level.
2. Use procedure below to check for fuel leakage.
3. Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leakage at connection points.
4. Start engine. With engine speed increased, check again for fuel leakage at connection points.
5. Run engine to check for unusual noise and vibration.
6. Warm up engine thoroughly to make sure there is no leakage of engine coolant, engine oil, working fluid, fuel and exhaust gas.
7. Bleed air from passages in pipes and tubes of applicable lines, such as in cooling system.
8. After cooling down engine, again check amounts of engine coolant, engine oil and working fluid. Refill to specified level, if necessary.
9. Summary of the inspection items: ENGINE RUNNING REFERENCE Item Before starting engine Engine running After engine stopped Engine coolant Level Leakage Level Engine oil Level Leakage Level Working fluid Level Leakage Level Fuel Leakage Leakage Leakage Exhaust gas - Leakage - *Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.

Scheme 17

Scheme 18

1. Remove camshaft and valve lifter relating to valve oil seal to be removed. Refer to " «REMOVAL AND INSTALLATION»(ref-239942-S11124923162006080400000) ".
2. Rotate crankshaft, and set piston whose oil seal is to removed to top dead center. This prevents valve from dropping inside cylinder. CAUTION: When rotating crankshaft, be careful to avoid scarring the front timing chain case with the timing chain.
3. Remove valve collet, valve spring retainer and valve spring using Tool. Tool numbers : KV10116200 (J-26336-B) : KV10115900 (J-26336-20) : KV10109230 ( - )
4. Remove valve oil seal using Tool. Tool number : KV10107902 (J-38959)

Scheme 19

1. Apply new engine oil to new valve oil seal joint surface and seal lip.
2. Press in valve oil seal to height "H" using Tool to specified height. Tool number : (J-39386) NOTE: Dimension "H": height measured before valve spring seat installation. Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
3. Installation of the remaining components is in the reverse order of removal.

Scheme 20

Scheme 21

Scheme 22

Scheme 23

1. Remove the following parts: Engine undercover. Drive belts. Refer to " «DRIVE BELTS»(ref-239942-S38195032912006080400000) ". Radiator fan. Refer to " «REMOVAL AND INSTALLATION»(ref-239944-S38082485752006080300000) ".
2. Remove the crankshaft pulley as follows: Remove the starter motor. Refer to " «4-SPEED A/T MODELS»(ref-239946-S23068949552006080300000) " or " «5-SPEED A/T MODELS»(ref-239946-S04097622622006080300000) ". Lock the ring gear using Tool attached to the starter bolt hole. Tool number : KV10117700 (J-44716) CAUTION: Do not damage the ring gear teeth, or the signal plate teeth behind the ring gear when setting the Tool. Loosen crankshaft pulley bolt using Tool and locate bolt seating surface at 10 mm (0.39 in) from its original position. Tool number : KV10109300 ( - ) Position a pulley puller at recess hole of crankshaft pulley to remove crankshaft pulley. CAUTION: Do not use a puller claw on crankshaft pulley periphery.
3. Remove front oil seal from front timing chain case. CAUTION: Be careful not to damage front timing chain case or crankshaft.

Scheme 24

Scheme 25

Scheme 26

1. Apply new engine oil to new oil seal and install it flush with front of mounting surface using a suitable tool. Install new oil seal in the direction as shown. Suitable drift Outer diameter : 59 mm (2.32 in) Inner diameter : 49 mm (1.93 in) CAUTION: Press fit straight and avoid causing burrs or tilting the oil seal.
2. Install crankshaft pulley and tighten the bolt in two steps. Lubricate thread and seat surface of the bolt with new engine oil. Apply a paint mark for the second step of angle tightening. Tool number : KV10109300 ( - ) Crankshaft pulley bolt Step 1 : 44 N.m (4.5 kg-m, 32 ft-lb) Step 2 : 60° - 65° degrees clockwise
3. Remove Tool attached to the starter bolt hole. Tool number : KV10117700 (J-44716)
4. Installation of the remaining components is in reverse order of removal.

Scheme 27

1. Remove transmission assembly. Refer to " «REMOVAL»(ref-239954-S14034064552006080300000) " (4 A/T), " «REMOVAL»(ref-239954-S29120438182006080300000) " (5 A/T).
2. Remove rear oil seal with a suitable tool. CAUTION: Be careful not to damage crankshaft and cylinder block.

Scheme 28

Scheme 29

1. Apply new engine oil to new rear oil seal joint surface and seal lip.
2. Install rear oil seal so that each seal lip is oriented as shown. Press in rear oil seal to the position as shown. Press-fit rear oil seal using Tool. Tool number : - (J-47128) CAUTION: Be careful not to damage crankshaft and cylinder block. Press-fit oil seal straight to avoid causing burrs or tilting. Do not touch grease applied onto oil seal lip.
3. Installation of the remaining components is in the reverse order of removal.

Scheme 30

1. Run the engine until it reaches normal operating temperature.
2. Turn the ignition switch to OFF.
3. Release fuel pressure and leave the fuel pump electrically disconnected. Refer to " «FUEL PRESSURE RELEASE»(ref-239940-S12688458762006080300000) ".
4. Remove all six spark plugs. Refer to " «REMOVAL AND INSTALLATION»(ref-239942-S26984150572006080400000) ".
5. Attach a compression tester to No. 1 cylinder.
6. Depress accelerator pedal fully to keep the electric throttle control actuator butterfly-valve wide open to maximize air intake flow.
7. Crank the engine and record the highest gauge indication.
8. Repeat the measurement on each cylinder (steps 5 - 7 ). NOTE: Always use a fully-charged battery to obtain specified engine speed. DIFFERENCE LIMIT BETWEEN CYLINDERS Unit: kPa (kg/cm 2 , psi)/300 RPM Standard Minimum Difference limit between cylinders 1,275 (13.0, 185) 981 (10.0, 142) 98 (1.0, 14)
9. If compression in one or more cylinders is low: Pour a small amount of engine oil into cylinders through the spark plug holes. Retest compression (steps 5 - 8 ). If adding oil helps raise compression pressure, then the piston rings may be worn or damaged. If so, replace piston rings after checking piston. If the pressure stays low, a valve may be sticking or is seating improperly. Inspect and repair the valve and/or valve seat. Refer to " «VALVE»(ref-239942-S21921792502006080400000) ". If the valve and/or valve seat is damaged excessively, replace as necessary. If compression stays low in two or more cylinders that are next to each other: The cylinder head gasket may be leaking. Both cylinders may have valve component damage. Inspect and repair as necessary.
10. After inspection is complete, install removed components.
11. Start engine and confirm that engine runs smoothly.
12. Perform trouble diagnosis. If DTC appears, erase it. Refer to " «TROUBLE DIAGNOSIS»(ref-239940-S04118865012006080300000) ".

1. Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required quantity, fill to the specified level. Refer to " «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-239935-S21612245322006080400000) ".
2. Use procedure below to check for fuel leakage.
3. Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leakage at connection points.
4. Start engine. With engine speed increased, check again for fuel leakage at connection points.
5. Run engine to check for unusual noise and vibration.
6. Warm up engine thoroughly to make sure there is no leakage of Fuel, exhaust gas, or any oils/fluids including engine oil and engine coolant.
7. Bleed air from passages in lines and hoses, such as in cooling system.
8. After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to specified level, if necessary.
9. Summary of the inspection items: ENGINE RUNNING REFERENCE Item Before starting engine Engine running After engine stopped Engine coolant Level Leakage Level Engine oil Level Leakage Level Other oils and fluids (1) Level Leakage Level Fuel Leakage Leakage Leakage Exhaust gas - Leakage - (1) Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.