Jeep Grand Cherokee WK. Manual — part 1234
7. Remove damper using Special Tools 8513A Insert
and 1023 Three Jaw Puller.
INSTALLATION
CAUTION: To prevent severe damage to the Crank-
shaft, Damper or Special Tool 8512–A, thoroughly
clean the damper bore and the crankshaft nose
before installing Damper.
1. Slide damper onto crankshaft slightly.
CAUTION: Special Tool 8512–A, is assembled in a
specific sequence. Failure to assemble this tool in
this sequence can result in tool failure and severe
damage to either the tool or the crankshaft.
2. Assemble Special Tool 8512–A as follows, The nut
is threaded onto the shaft first (2). Then the roller
bearing (1) is placed onto the threaded rod (3) The
hardened bearing surface of the bearing (1) MUST
face the nut (2). Then the hardened washer (5)
slides onto the threaded rod (3). Once assembled coat the threaded rod’s threads with Mopar
T
Nickel Anti-Seize
or (Loctite No. 771).
3. Using Special Tool 8512–A, press damper onto crankshaft.
4. Install then tighten crankshaft damper bolt to 176 N·m (129 ft. lbs.).
5. Install radiator upper hose.
6. Install accessory drive belt (Refer to 7 - COOLING/ACCESSORY DRIVE/DRIVE BELTS - INSTALLATION).
7. Refill cooling system (Refer to 7 - COOLING - STANDARD PROCEDURE).
8. Connect negative cable to battery.
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ENGINE - 5.7L SERVICE INFORMATION
WK
COVER-STRUCTURAL
DESCRIPTION
The structural dust cover (1) is made of die cast alu-
minum and joins the lower half of the transmission bell
housing to the engine oil pan.
OPERATION
The structural cover provides additional powertrain stiffness and reduces noise and vibration.
REMOVAL
1. Remove the 4 bolts (2) attaching the structural dust
cover (1) to the transmission and the oil pan.
2. Remove the structural dust cover from the vehicle.
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ENGINE - 5.7L SERVICE INFORMATION
9 - 1533
INSTALLATION
1. Position the structural dust cover (1) onto the oil
pan and transmission.
2. Install the 4 bolts (2) and torque to 54N·m (39 ft.
lbs).
SOLENOID-MDS
DESCRIPTION
The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy. It has two
modes of operation :
•
8 cylinders for acceleraton and heavy loads.
•
4 cylinders for cruising and city traffic.
The main components of the Multi Displacement System are :
•
Unique MDS camshaft.
•
Deactivating roller tappets.
•
4 control valves/solenoids.
•
control valve/solenoid wiring harness.
•
oil temp sensor.
OPERATION
Cylinder Deactivation
•
Trap an exhaust charge
•
Normal combustion event
•
Don’t open exhaust valve
•
Don’t open intake valve
•
Piston is an air spring
•
Cylinders deactivated in firing sequence
Cylinder Reactivation
•
Empty the cylinder
•
Open exhaust valve
•
Open intake valve
•
Normal combustion event
•
Cylinders reactivated in firing sequence
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ENGINE - 5.7L SERVICE INFORMATION
WK
DIAGNOSIS AND TESTING
The Multi Displacement System has the following detectible issues:
•
Solenoid circuit
•
Fail to deactivate a cylinder(s)
•
Fail to reactivate a cylinder(s)
•
Low oil pressure
CONDITION
POSSIBLE CAUSES
CORRECTION
MDS does not activate
1. Low oil pressure
1. Check for proper oil pressure
2. Bad oil temp sensor
2. Replace oil temp sensor
3. Malfunctioning MDS Solenoid
3. Replace Solenoid
4. Malfunctioning MDS Tappet
4. Replace Tappet
MDS Does Not Deactivate
1. Low oil pressure
1. Check for proper oil pressure
2. Bad oil temp sensor
2. Replace oil temp sensor
3. Malfunctioning MDS Solenoid
3. Replace Solenoid
4. Malfunctioning MDS Tappet
4. Replace Tappet
REMOVAL
1. Disconnect the negative battery cable.
2. Remove the intake manifold. (Refer to 9 - ENGINE/MANIFOLDS/INTAKE MANIFOLD - REMOVAL).
3. Remove wiring harness connectors from the MDS solenoids.
4. Remove hold down bolt from MDS solenoid.
5. Remove MDS solenoid.
INSTALLATION
1. Install MDS solenoid fully into block.
2. Install hold down bolt and torque to 11 N·m (97 in. lbs.).
3. Reconnect the MDS wiring harness to the solenoids.
4. Install the intake manifold. (Refer to 9 - ENGINE/MANIFOLDS/INTAKE MANIFOLD - INSTALLATION).
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ENGINE - 5.7L SERVICE INFORMATION
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