3.0l v6 - VIN [3] Dodge Dynasty I

ENGINE IDENTIFICATION

Note. For engine repair procedures not covered in this article, see ENGINE OVERHAUL PROCEDURES - GENERAL INFORMATION article in the GENERAL INFORMATION section.

Engine may be identified by using Vehicle Identification Number (VIN) stamped on metal tab, located near lower left corner of windshield. The eighth character identifies the engine model.

Engine identification number may be required when ordering replacement components. Engine identification number is located on cylinder block, below cylinder head.

ENGINE IDENTIFICATION CODES

VALVE ARRANGEMENT

Front Bank - I-E-I-E-I-E (Front-to-rear).

Rear Bank - E-I-E-I-E-I (Front-to-rear).

VALVE CLEARANCE ADJUSTMENT

Hydraulic lash adjusters are used. No valve adjustment is required.

Note. For reassembly reference, label all electrical connectors, vacuum hoses and fuel lines before removal. Also place mating marks on engine hood and other major assemblies before removal.

FUEL PRESSURE RELEASE

1. Loosen fuel tank cap to release pressure. Disconnect injector wiring harness from engine wiring harness. Connect jumper wire from terminal No. 1 of injector harness to ground. (Scheme 23)
2. Connect jumper wire to terminal No. 2 of injector harness. Touch jumper wire to positive battery terminal for no more than 5 seconds to release fuel pressure. Remove jumper wires and reconnect wiring harness.

Scheme 23

ENGINE

Scheme 24

1. Loosen fuel tank cap to release pressure. Disconnect injector wiring from engine wiring harness. Connect jumper wire from terminal No. 1 of injector harness to ground. see scheme 2and (Scheme 24).
2. Connect jumper wire to terminal No. 2 of injector harness. Touch jumper wire to positive battery terminal for no more than 5 seconds to release fuel pressure. Remove jumper wires and reconnect wiring harness.
3. Disconnect battery cables. Mark hood hinge location on hood and remove hood. Drain cooling system. Disconnect all electrical connections and vacuum hoses. Disconnect radiator and heater hoses. Remove radiator and fan assembly.
4. Wrap shop towel around fuel lines. Remove fuel lines from fuel rail by pushing inward on plastic ring located at end of fuel line fitting and pull fuel line from fitting. Disconnect accelerator cable.
5. Remove air cleaner assembly. Raise vehicle and drain engine oil. Remove A/C compressor with hoses attached. Disconnect exhaust pipe at manifolds. Remove transaxle inspection cover.
6. Mark flex plate-to-torque converter position. Remove torque converter mounting bolts. Attach "C" clamp to retain torque converter in transaxle housing. Remove power steering pump with hoses attached and set aside. Remove lower transaxle-to-block mounting bolts. Remove starter.
7. Lower vehicle. Disconnect ground strap. Support transaxle. Attach engine hoist to engine. Remove upper transaxle mounting bolts. Mark right engine mount position on right rail support. Remove mount-to-rail mounting bolts. CAUTION: Mark engine mount location on frame for reassembly reference.
8. Remove front engine mount through bolt. Remove left engine mount through bolt from inside wheelwell or insulator bracket-to-transaxle bolts. Remove engine.

Installation

1. To install, reverse removal procedure. Ensure fuel lines are installed until a "click" sound is heard. Align engine mounts and install. DO NOT tighten mounting bolts until all mounting brackets and bolts have been installed. Check axle shaft length with damper weight removed.
2. Axle shaft length must be within specification. Refer to the «AXLE SHAFTS - FRONT»(/dodge/dynasty/i-1987-1993/remont/axle-shafts/#axle-shafts-front) article. If axle shaft length requires adjustment, support engine/transaxle assembly with a floor jack. Loosen vertical bolts on engine mount near timing belt cover and front engine mount bracket-to-front crossmember bolts. Pry engine right or left as required to obtain correct axle shaft length.
3. Tighten mounting bolts and nuts to specification. Recheck axle shaft length. Install damper weight and tighten to specification (if equipped). Fill cooling system.

INTAKE MANIFOLD

Removal

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3__fuel-pressure-release) in this article. Disconnect battery cables. Drain cooling system. Remove air cleaner-to-throttle body hose.
2. Disconnect control cables at throttle body. Disconnect Automatic Idle Speed (AIS) motor and Throttle Position Sensor (TPS) wiring harness connectors at throttle body. Remove vacuum hoses from throttle body.
3. Remove EGR tube flange from air intake plenum. Disconnect wiring connectors from charge temperature sensor and coolant temperature sensor. Remove vacuum hoses from air intake plenum. Remove fuel hoses at fuel rail.
4. Remove air intake plenum-to-intake (cross) manifold bolts. Remove air intake plenum. Cover intake manifold ports. Remove vacuum hoses from fuel rail and fuel pressure regulator. Disconnect fuel injector wiring harness from engine wiring harness.
5. Remove fuel pressure regulator from fuel rail. Remove fuel rail retaining bolts and fuel rail. Disconnect radiator and heater hoses from manifold. Remove intake (cross) manifold retaining nuts and remove manifold. (Scheme 25)

Scheme 25

Inspection

Check for damage or cracks on all mounting surfaces. Check for clogged coolant and fuel passages. Check air intake plenum and cylinder head mounting surfaces for warpage. Repair as necessary if warpage exceeds specification. See INTAKE MANIFOLD WARPAGE table.

INTAKE MANIFOLD WARPAGE

1. To install, reverse removal procedure. Ensure injector holes are clean. Lubricate injector "O" rings with engine oil prior to installation. Install injector until firmly seated in port.
2. Install air intake plenum gaskets with beaded sealant side away from intake (cross) manifold. Tighten intake (cross) manifold nuts and air intake plenum bolts to specification in proper sequence. (Scheme 26)and (Scheme 27). Tighten remaining bolts to specification. See «TORQUE SPECIFICATIONS»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3__torque-specifications) at end of article. Fill cooling system.

Scheme 26

Scheme 27

1. Raise vehicle and disconnect exhaust pipe from rear exhaust manifold flange. Disconnect EGR tube from rear manifold. Disconnect O2 sensor wiring. Remove exhaust crossover pipe mounting bolts. Remove rear manifold retaining nuts and remove manifold.
2. Lower vehicle. Remove screws attaching heat shield to front manifold. Disconnect exhaust crossover pipe at front manifold. Remove front manifold retaining nuts and remove manifold.

Check manifolds for cracks, damage and mounting surfaces for warpage. Repair or replace manifold if warpage exceeds .008" (.20 mm).

To install, reverse removal procedure. Install gasket with numbers 1-3-5 embossed toward the top, on rear exhaust manifold. Install gasket with numbers 2-4-6 embossed toward the top, on front exhaust manifold. Tighten mounting bolts and nuts to specification. See TORQUE SPECIFICATIONS at end of article.

1. Remove the timing belt and camshaft sprockets. Refer to «TIMING BELT»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3) in this article. Remove camshafts and rocker arms. See «CAMSHAFT & ROCKER ARMS»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3__camshaft-rocker-arms) in this article.
2. Remove intake manifold. See «INTAKE MANIFOLD»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3__intake-manifold). Remove exhaust manifold. See «EXHAUST MANIFOLDS»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3).
3. Remove distributor. Remove cylinder head bolts in sequence and remove cylinder head. (Scheme 28)

Scheme 28

Check cylinder head for warpage. Resurface head if warpage exceeds .002" (.05 mm). DO NOT grind more than .008" (.20 mm) total from surface of cylinder head and deck surface of cylinder block.

To install, reverse removal procedure using new gasket. Tighten cylinder head bolts to specification in sequence using 2-3 steps. (Scheme 28)

FRONT CRANKSHAFT OIL SEAL

Seal is mounted in oil pump case. See OIL PUMP .

1. Disconnect negative battery cable. Loosen accessory drive belts. Remove A/C compressor mounting bolts and A/C compressor with hoses attached. Remove A/C compressor mounting bracket and drive belt tensioner. Remove power steering/alternator belt tensioner. Remove power steering pump.
2. Raise and support vehicle. Remove right inner fender shield. Remove crankshaft pulley and vibration damper. Lower vehicle and support engine with a jack. Separate engine mount from engine bracket. Raise engine slightly. Remove engine mount bracket.
3. Remove timing belt cover, noting bolt lengths for reassembly reference. Rotate engine and align timing marks on front and rear camshaft sprockets, and on crankshaft sprocket. (Scheme 29) Mark timing belt direction of rotation for reassembly reference.
4. Loosen timing belt tensioner. Remove timing belt. Remove flange located in front of crankshaft sprocket (if necessary). If camshaft sprocket removal is required, use Camshaft Sprocket Holder (MB990775). Hold camshaft sprocket and loosen camshaft sprocket retaining bolt. Remove retaining bolt and sprocket.

Scheme 29

1. Install camshaft sprockets if removed. Using camshaft sprocket holder, tighten sprocket bolt to specification. See, at the end of this article, «TORQUE SPECIFICATIONS»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3__torque-specifications). Align all timing marks. Install timing belt on crankshaft sprocket. Hold timing belt tight on tension side and install belt on the front (radiator side) camshaft sprocket. (Scheme 29)
2. Install timing belt on water pump pulley, rear camshaft sprocket and then on timing belt tensioner. Apply rotating force on front (radiator side) camshaft sprocket in opposite direction to apply pressure on tension side of belt. Ensure all timing marks are aligned.
3. Install flange on front of crankshaft sprocket. Loosen tensioner bolt and allow spring tension to be applied to the belt. Rotate crankshaft smoothly 2 full revolutions clockwise. NOTE: Rotate crankshaft in a clockwise direction. DO NOT rotate crankshaft counterclockwise.
4. Realign all timing marks and tighten timing belt tensioner to 21 ft. lbs. (29 N.m). To install remaining components, reverse removal procedure.

ROCKER ARMS & LASH ADJUSTER

See CAMSHAFT & ROCKER ARMS below.

CAMSHAFT & ROCKER ARMS

Note. Auto lash adjuster operation should be checked before removing rocker arms.

1. Remove spark plug wires and valve covers. To check auto lash adjuster operation, insert a small wire through air bleed hole, located on top of rocker arm, directly above auto lash adjuster. Very lightly push auto adjuster check ball downward. While holding check ball downward, check rocker arm for free play. If no free play exists, replace auto lash adjuster.
2. Install Auto Lash Adjuster Retainers (MD998443). (Scheme 30) Remove distributor and distributor adapter from cylinder head. Remove timing belt and camshaft sprockets. See «TIMING BELT»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3) in this article.
3. Loosen, but DO NOT remove, camshaft bearing cap bolts. Mark location of rocker arm components and bearing caps. Remove rocker arms, shafts and bearing caps as an assembly. Remove camshaft.

Scheme 30

Disassembly & Inspection

1. Note location and direction of rocker arm components and bearing caps. Disassemble rocker arms. (Scheme 31) Ensure intake valve rocker arm shaft has a.12" (3 mm) oil hole in bottom of shaft. Exhaust valve rocker shaft does not have oil hole. The oil hole supplies oil to the exhaust valve rocker arm.
2. Inspect components for damage. Replace if damaged. Ensure all oil holes are not restricted. Inspect camshaft and cylinder head journal areas for damage. Inspect distributor drive gear for damage. Measure lobe height. Replace camshaft if not within specification. See «CAMSHAFT SPECIFICATIONS»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3) tables at end of article.

Note. Bearing caps are numbered for installation sequence.

Reassembly & Installation

1. Lubricate camshaft with engine oil and install. Ensure rocker arm shaft for intake valves contains an additional oil feed hole in the bottom of the shaft. Install rocker arm components in original location. (Scheme 31)
2. Install No. 1 bearing cap on rocker arm with machined portion of rocker arm shaft facing downward, toward the cylinder head. This will position notch areas of rocker arm shafts upward, pointing toward outside of bearing cap.
3. Apply sealant to bearing cap mating surfaces at both ends of cylinder head. Ensure arrows on bearing caps are pointing in same direction as arrow on cylinder heads. Ensure bearing cap numbers are in order. (Scheme 32)
4. Tighten camshaft bearing cap bolts to 85 INCH lbs. (10 N.m) in the following sequence: No. 3, No. 2, No. 1, and No. 4. Repeat procedure and tighten bolts to 15 ft. lbs. (20 N.m). Install distributor adapter with new "O" ring. Coat camshaft oil seal lip with grease.
5. Thread Seal Installer (MD998713) into camshaft and install camshaft oil seal. Using Plug Installer (MD998306), install camshaft plug. Prior to installing valve cover, apply RTV sealant at front and rear bearing cap-to-valve cover gasket contact areas. To complete installation, reverse removal procedure.

Scheme 31

Scheme 32

Removal & Installation

1. Remove transaxle, flywheel or drive plate. Remove seal from housing. It may be necessary to remove seal housing for seal removal.
2. Lubricate seal lip with engine oil. Using Seal Driver (MD998718), install rear crankshaft oil seal in housing. If housing was removed, apply RTV sealant on seal housing-to-cylinder block surface. Install seal assembly on cylinder block and tighten bolts.

OIL PAN

Note. Manufacturer lists procedure with engine removed only.

Drain engine oil. Remove oil pan bolts and oil pan. To install, reverse removal procedure using new gasket. Refer to, at the end of this article, TORQUE SPECIFICATIONS .

CYLINDER HEAD

Inspect cylinder head for cracks and warpage. Repair or replace cylinder head if warpage exceeds specification. Refer to CYLINDER HEAD SPECIFICATIONS tables at end of article. DO NOT grind more than .008" (.20 mm) total from surface of cylinder head and deck surface of cylinder block.

VALVE SPRINGS

Inspect valve spring for proper tension, free length and maximum out-of-square. Replace if not within specification. Refer to VALVES & VALVE SPRINGS SPECIFICATIONS tables at end of article. Valve springs should be installed with enamel-coated end toward the spring retainer.

VALVE GUIDES

Make sure the valve guide I.D. is within specification. Refer to CYLINDER HEAD SPECIFICATIONS tables at end of article. No service procedure is available from manufacturer.

VALVE SEAT

Valve seat width must be within specification. Refer to the CYLINDER HEAD SPECIFICATIONS table at end of article. No replacement procedure is available from manufacturer.

SEAT CORRECTION ANGLES

After grinding, if seat width is too wide, use a 15-degree or 65-degree stone to alter seat width. A 15-degree stone will lower valve seat and a 65-degree stone will raise the valve seat.

Rocker Arms & Auto Lash Adjusters

See CAMSHAFT & ROCKER ARMS in this article for service procedure.

Piston & Rod Assembly

1. Ensure pistons and rods are installed in original cylinder location. Note cylinder number and location. (Scheme 31)
2. For cylinders No. 1, 3 and 5, install pistons with the "R" mark on top of piston toward the timing belt side of engine. For cylinders No. 2, 4 and 6, install piston with the "L" mark toward the timing belt side of engine. Ensure front mark "72" on connecting rod is facing toward timing belt side of engine. (Scheme 33)

Scheme 33

Fitting Pistons

Piston diameter should be measured at right angle to piston pin, approximately .08" (2.0 mm) from bottom of the piston skirt.

Piston Rings

Ensure ring end gap and side clearances are within specification. See PISTONS, PINS & RINGS tables at end of article. Position ring gaps in proper location. (Scheme 34)

Scheme 34

Rod Bearings

When replacing rod bearings, make sure the front mark "72" on the connecting rod is facing toward the timing belt side of the engine. (Scheme 33)

Crankshaft & Main Bearings

1. All upper main bearings contain oil grooves while lower bearings installed in main bearing cap assembly do not. Crankshaft end play is controlled by thrust bearings on No. 3 main bearing journal.
2. Main bearing cap assembly must be installed with arrow toward the front (timing belt end) of engine. Coat bolts with oil prior to installation. Bolts must be tightened to specification in proper sequence. See the «TORQUE SPECIFICATIONS»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3__torque-specifications) at the end of the article. (Scheme 35)

Scheme 35

Thrust Bearing

1. Engine uses different types of thrust bearings. One type uses positioning tabs, while the other type is plain. One set (thrust bearing with tab and plain thrust bearing) go in cylinder block and in main bearing cap assembly at the No. 3 main bearing.
2. Plain thrust bearing goes on front (timing belt side) of cylinder block and rear (flywheel side) of main bearing cap assembly. Tab thrust bearing goes on rear (flywheel side) of cylinder block and on front (timing belt side) of main bearing cap assembly.

Cylinder Block

1. Check cylinder block head surface warpage, cylinder bore diameter, taper and out-of-round. Measurements should be taken .50" (12.7 mm) below top surface of cylinder bore, middle of bore and .50" (12.7 mm) from bottom of cylinder bore.
2. Repair or replace cylinder block if not within specification. See «CYLINDER BLOCK»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3) tables at end of article.

Oil Pump

The crankshaft-driven oil pump provides lubrication to the main gallery. (Scheme 36)

Crankcase Capacity

Crankcase capacity with oil filter is 4.5 qts. (4.3L).

Normal Oil Pressure

Oil pressure should be 35-100 psi (2.5-7.0 kg/cm 2 ) at 3000 RPM with engine at normal operating temperature.

Scheme 36

Removal & Disassembly

1. Remove timing belt and crankshaft sprocket. Refer to «TIMING BELT»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3) in this article. Remove the oil pan and pick-up tube. NOTE: Manufacturer lists OIL PAN removal and installation procedures with engine removed only.
2. Remove oil pump-to-cylinder block bolts. Note bolt location and length for reassembly. Remove oil pump. Disassemble oil pump. (Scheme 37) Remove oil seals from oil pump case.

1. Inspect components for damage. Measure clearance between small area of inner rotor and oil pump case. Measure clearance between outer rotor and oil pump case.
2. Install inner rotor and outer rotor in oil pump case. Place a straightedge across the pump case and both rotors. Using a feeler gauge, check the rotor end clearance between the rotors and the straightedge. Ensure relief plunger slides freely in the bore. Replace the oil pump assembly if measurements exceed specification. Refer to the «OIL PUMP SPECIFICATIONS»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3) table below.

OIL PUMP SPECIFICATIONS

1. To reassemble, reverse disassembly procedure. Ensure components are installed in original location. If oil seal was removed from oil pump case, use Seal Installer (MB998306) to install new seal. Lubricate seal lip with oil prior to installation.
2. To install, reverse removal procedure. Ensure bolts are installed in original location. See «TORQUE SPECIFICATIONS»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3__torque-specifications) at end of article. Also (Scheme 37)

Scheme 37

1. Remove timing belt. See «TIMING BELT»(/dodge/dynasty/i-1987-1993/remont/mechanical/#30l-v6-vin-3) in this article. Drain cooling system. Remove water pump mounting bolts and water pump.
2. To install, reverse removal procedure using new gasket. Install new "O" ring on coolant inlet pipe. Apply water to "O" ring prior to pump installation. DO NOT apply grease to "O" ring. Install remaining components and fill cooling system.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

GENERAL ENGINE SPECIFICATIONS

GENERAL ENGINE SPECIFICATIONS

CRANKSHAFT MAIN & CONNECTING ROD BEARINGS

CRANKSHAFT MAIN & CONNECTING ROD BEARINGS

CONNECTING ROD SPECIFICATIONS

CONNECTING ROD SPECIFICATIONS

PISTONS, PINS & RINGS SPECIFICATIONS

PISTONS, PINS & RINGS SPECIFICATIONS

CYLINDER BLOCK SPECIFICATIONS

CYLINDER BLOCK SPECIFICATIONS

VALVES & VALVE SPRINGS SPECIFICATIONS

VALVES & VALVE SPRINGS SPECIFICATIONS

CYLINDER HEAD SPECIFICATIONS

CYLINDER HEAD SPECIFICATIONS

CAMSHAFT SPECIFICATIONS

CAMSHAFT SPECIFICATIONS

See also:
• ENGINE OVERHAUL PROCEDURES - GENERAL INFORMATION
• AXLE SHAFTS - FRONT
• FUEL PRESSURE RELEASE
• INTAKE MANIFOLD WARPAGE
• TORQUE SPECIFICATIONS
• CAMSHAFT & ROCKER ARMS
• INTAKE MANIFOLD