Jeep Wrangler TJ. Manual — part 450
RING SIDE CLEARANCE CHART
ITEM
SPECIFICATION
Top Compression Ring
0.042 - 0.084 mm
(0.0017 - 0.0033 in.)
Second Compression
Ring
0.042 - 0.084 mm
(0.0017 - 0.0033 in.)
Oil Control Ring
0.06 - 0.21 mm
(0.0024 - 0.0083 in.)
(4) Place ring in the cylinder bore and push down
with inverted piston to position near lower end of the
ring travel. Measure ring gap with a feeler gauge fit-
ting snugly between ring ends (Fig. 65).
RING GAP MEASUREMENT CHART
ITEM
SPECIFICATION
Top Compression Ring
0.229 - 0.610 mm
(0.0090 - 0.0240 in.)
Second Compression
Ring
0.483 - 0.965 mm
(0.0190 - 0.080 in.)
Oil Control Ring
0.254 - 1.500 mm
(0.010 - 0.060 in.)
(5) The oil control rings are symmetrical, and can
be installed with either side up. It is not necessary to
use a tool to install the upper and lower rails. Insert
oil rail spacer first, then side rails.
(6) The two compression rings are different and
cannot be interchanged. The top compression ring
can be identified by the shiny coating on the outer
sealing surface and can be installed with either side
up. (Fig. 66).
Fig. 66 Top Compression ring identification
1 - TOP COMPRESSION RING
Fig. 64 Ring Side Clearance Measurement
1 - FEELER GAUGE
Fig. 65 Gap Measurement
1 - FEELER GAUGE
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ENGINE 4.0L
9 - 115
PISTON RINGS (Continued)
(7) The second compression ring has a slight
chamfer on the bottom of the inside edge and a dot
on the top for correct installation (Fig. 67) and (Fig.
68).
(8) Using a ring installer, install the second com-
pression ring with the dot facing up (Fig. 67) (Fig.
69).
(9) Using a ring installer, install the top compres-
sion ring (either side up).
Ring Gap Orientation
• Position the gaps on the piston as shown (Fig.
70).
• Oil spacer - Gap on center line of piston skirt.
• Oil rails - gap 180° apart on centerline of piston
pin bore.
• No. 2 Compression ring - Gap 180° from top oil
rail gap.
• No. 1 Compression ring - Gap 180° from No. 2
compression ring gap.
Fig. 67 Second Compression Ring Identification
1 - SECOND COMPRESSION RING
2 - CHAMFER
3 - ONE DOT
Fig. 68 Compression Ring Chamfer Location
1 - TOP COMPRESSION RING
2 - SECOND COMPRESSION RING
3 - PISTON
4 - CHAMFER
Fig. 69 Compression Ring Installation
1 - COMPRESSION RING
2 - RING EXPANDER RECOMMENDED
Fig. 70 Ring Gap Orientation
1 - TOP COMPRESSION RING
2 - BOTTOM COMPRESSION RING
3 - TOP OIL CONTROL RAIL
4 - OIL RAIL SPACER
5 - BOTTOM OIL CONTROL RAIL
6 - IMAGINARY LINE PARALLEL TO PISTON PIN
7 - IMAGINARY LINE THROUGH CENTER OF PISTON SKIRT
9 - 116
ENGINE 4.0L
TJ
PISTON RINGS (Continued)
VIBRATION DAMPER
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove the serpentine drive belt (Refer to 7 -
COOLING/ACCESSORY
DRIVE/DRIVE
BELTS
-
REMOVAL) and fan shroud.
(3) Remove the vibration damper retaining bolt
and washer.
(4) Use Vibration Damper Removal Tool 7697 to
remove the damper from the crankshaft (Fig. 71).
INSTALLATION
(1) Apply Mopar
t Silicone Rubber Adhesive Seal-
ant to the keyway in the crankshaft and insert the
key. With the key in position, align the keyway on
the vibration damper hub with the crankshaft key
and tap the damper onto the crankshaft.
(2) Install the vibration damper retaining bolt and
washer.
(3) Tighten the damper retaining bolt to 108 N·m
(80 ft. lbs.) torque.
(4) Install the serpentine drive belt (Refer to 7 -
COOLING/ACCESSORY
DRIVE/DRIVE
BELTS
-
INSTALLATION) and fan shroud.
(5) Connect negative cable to battery.
STRUCTURAL SUPPORT
REMOVAL
The engine bending braces are used to add
strength to the powertrain and to address some
minor NVH concerns.
NOTE: Before the engine or the transmission can be
removed the engine bending braces must be removed.
(1) Raise and support vehicle.
NOTE: Both left and right side bending braces are
removed the sameway. Only the right side is
shown.
NOTE: The exhaust does not require removal to
preform this procedure.
(2) Remove the exhaust hanger bracket retaining
bolt.
(3) Remove
locknut
and
transmission
bending
brace bar.
(4) Remove engine-to-bending brace retaining bolt,
bending brace bar and cross bar.
INSTALLATION
NOTE: DO NOT tighten the retaining hardware until
all bending braces are in place.
(1) Position the cross brace into the engine-to-
transmission brace, then position the engine-to-trans-
mission brace and install retaining bolt.
(2) Position the transmission bending brace onto
through brace and install new locknut.
(3) Position
exhaust
hanger
and
transmission
brace, install retaining bolt (Fig. 73).
(4) Tighten engine-to-transmission brace retaining
bolt (Fig. 72)to 40 N·m (30 ft. lbs.).
Fig. 72 Engine-to-Transmission Bending Braces
1 - ENGINE-TO-TRANSMISSION BENDING BRACE
2 - CROSS BRACE
3 - ENGINE-TO-TRANSMISSION BENDING BRACE RETAINING
BOLT
Fig. 71 Vibration Damper Removal Tool 7697
1 - VIBRATION DAMPER REMOVAL TOOL
2 - WRENCH
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ENGINE 4.0L
9 - 117
(5) Tighten transmission brace retaining bolts (Fig.
73)to 40 N·m (30 ft. lbs.), then tighten transmission
brace retaining lock nuts (Fig. 73) to 108 N·m (80 ft.
lbs.).
FRONT MOUNT
REMOVAL
The front mounts support the engine at each side.
These supports are made of resilient rubber.
(1) Disconnect negative cable from battery.
(2) Raise the vehicle.
(3) Support the engine.
(4) Remove the nut from the through bolt (Fig. 74)
(Fig. 75). DO NOT remove the through bolt.
(5) Remove the retaining bolts and nuts from the
insulator.
(6) Remove the through bolt.
(7) Remove the insulator.
Fig. 73 Transmission Bending Braces and Exhaust
Hanger
1 - TRANSMISSION BENDING BRACE RETAINING BOLT
2 - ENGINE-TO-TRANSMISSION BENDING BRACE
3 - LOCKNUT
4 - TRANSMISSION BRACE
5 - EXHAUST HANGER
Fig. 74 Left Front Engine Mount
1 - BOLT (2)
2 - THROUGH BOLT
3 - NUT (2)
4 - BOLT (3)
5 - LEFT HAND ENGINE MOUNT ASSEMBLY
Fig. 75 Right Front Engine Mount
1 - RIGHT HAND ENGINE MOUNT ASSEMBLY
2 - THROUGH BOLT
3 - BOLT (3)
9 - 118
ENGINE 4.0L
TJ
STRUCTURAL SUPPORT (Continued)
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