Jeep Grand Cherokee WK. Manual — part 1197
PISTON RING SPECIFICATION CHART
Ring Position
Groove Clearance
Maximum Clearance
Upper Ring
.051-.094 mm
0.11 mm
(0.0020-.0037 in.)
(0.004 in.)
Intermediate Ring
0.04-0.08 mm
0.10 mm
(0.0016-0.0031 in.)
(0.004 in.)
Oil Control Ring
.019-.229 mm
.25 mm
(Steel Rails)
(.0007-.0090 in.)
(0.010 in.)
Ring Position
Ring Gap
Wear Limit
Upper Ring
0.20-0.36 mm
0.43 mm
(0.0079-0.0142 in.)
(0.0017 in.)
Intermediate Ring
0.37-0.63 mm
0.74 mm
(0.0146-0.0249 in.)
(0.029 in.)
Oil Control Ring
0.025-0.76 mm
1.55 mm
(Steel Rail)
(0.0099- 0.03 in.)
(0.061 in.)
7. The No. 1 and No. 2 piston rings have a different
cross section. Ensure No. 2 ring is installed with
manufacturers I.D. mark (Dot) facing up, towards
top of the piston.
NOTE: Piston rings are installed in the following
order:
•
Oil ring expander.
•
Upper oil ring side rail.
•
Lower oil ring side rail.
•
No. 2 Intermediate piston ring.
•
No. 1 Upper piston ring.
8. Install the oil ring expander.
9. Install upper side rail (1) by placing one end
between the piston ring groove and the expander
ring. Hold end firmly and press down the portion to
be installed until side rail is in position. Repeat this step for the lower side rail.
10. Install No. 2 intermediate piston ring using a pis-
ton ring installer.
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ENGINE - 4.7L SERVICE INFORMATION
WK
11. Install No. 1 upper piston ring using a piston ring installer.
12. Position piston ring end gaps as shown in. It is
important that expander ring gap (5) is at least
45° from the side rail gaps, but not on the piston
pin center or on the thrust direction.
DAMPER - CRANKSHAFT
REMOVAL
1. Disconnect negative cable from battery.
2. Remove accessory drive belt (Refer to 7 - COOL-
ING/ACCESSORY
DRIVE/DRIVE
BELTS
-
REMOVAL).
3. Drain cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
4. Remove radiator upper hose.
5. Remove upper fan shroud.
6. Using Special Tools 6958 Spanner with Adapter
Pins 8346 (1), loosen fan and viscous assembly
from water pump.
7. Remove fan and viscous assembly.
8. Disconnect electrical connector for fan mounted
inside radiator shroud.
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ENGINE - 4.7L SERVICE INFORMATION
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NOTE: Transmission cooler line snaps into shroud
lower right hand corner.
9. Remove crankshaft damper bolt.
10. Remove damper using Special Tools 8513 Insert
and 1026 Three Jaw Puller (2).
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. Align crankshaft damper slot with key in crankshaft.
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
(2) is threaded onto the shaft first. Then the roller
bearing (1) is placed onto the threaded rod (3)
(The hardened bearing surface of the bearing (1)
MUSTface the nut (2). Then the hardened washer (5)slides onto the threaded rod. Once assembled coat the
threaded rod’s threads with Mopar
T
Nickel Anti-Seize or equivalent.
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ENGINE - 4.7L SERVICE INFORMATION
WK
3. Using Special Tool 8512–A, press damper onto
crankshaft (1).
4. Install then tighten crankshaft damper bolt to 175
N·m (130 ft. lbs.).
5. Install fan blade assembly (Refer to 7 - COOLING/
ENGINE/FAN
DRIVE
VISCOUS
CLUTCH
-
INSTALLATION).
6. Install radiator upper shroud and tighten fasteners
to 11 N·m (95 in. lbs.).
7. Connect electrical connector for shroud fan.
8. Install radiator upper hose.
9. Install accessory drive belt (Refer to 7 - COOLING/
ACCESSORY DRIVE/DRIVE BELTS - INSTALLA-
TION).
10. Refill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
11. Connect negative cable to battery.
STRUCTURAL COVER
DESCRIPTION
The structural dust cover is made of die cast aluminum and joins the lower half of the transmission bell housing to
the engine bedplate.
OPERATION
The structural cover provides additional powertrain stiffness and reduces noise and vibration.
REMOVAL
1. Raise vehicle on hoist.
2. Remove the left hand exhaust pipe from exhaust
manifold.
3. Loosen the right hand exhaust manifold-to-exhaust
pipe retaining bolts.
4. Remove the eight bolts (1,2,3) retaining structural
cover in the sequence shown.
5. Pivot the exhaust pipe downward and remove the
structural cover.
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ENGINE - 4.7L SERVICE INFORMATION
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