Jeep Wrangler TJ. Manual — part 433
VIBRATION DAMPER
REMOVAL
(1) Remove accesory drive belts. (Refer to 7 -
COOLING/ACCESSORY
DRIVE/DRIVE
BELTS
-
REMOVAL)
(2) Remove crankshaft damper bolt.
(3) Remove damper using Special Tool 3-Jaw
Puller 1026 and Insert 6827–A (Fig. 74).
INSTALLATION
(1) Install crankshaft vibration damper using M12
1.75 x 150 mm bolt, washer, thrust bearing and nut
from Special Tool 6792 (Fig. 75).
(2) Install crankshaft vibration damper bolt and
tighten to 142 N·m (105 ft. lbs.).
(3) Install accessory drive belts. (Refer to 7 -
COOLING/ACCESSORY
DRIVE/DRIVE
BELTS
-
INSTALLATION)
STRUCTURAL COLLAR
REMOVAL
(1) Raise vehicle on hoist.
(2) Remove structural collar attaching bolts.
(3) Remove collar.
INSTALLATION
CAUTION: Torque procedure for the structural collar
must be followed or damage could occur to oil pan
and collar.
(1) Perform the following steps for installing struc-
tural collar.
• Step 1: Position collar between transmission and
oil pan. Install collar to transmission bolts, hand
start only.
• Step 2: Install collar to oil pan bolts, hand snug
only.
• Step 3: Tighten collar to transmission bolts.
• Step 4: Tighten collar to oil pan bolts.
(2) Lower vehicle.
ENGINE MOUNTING
DESCRIPTION
The engine mounting system consist of three
mounts; right and a left side support the powertrain,
and rear mount to control powertrain torque. The
mounts are of molded rubber material.
Fig. 74 Crankshaft Vibration Damper - Removal -
Typical
1 - SPECIAL TOOL 1026 3-JAW PULLER
2 - SPECIAL TOOL 6827–A INSERT
Fig. 75 Crankshaft Vibration Damper - Installation -
Typical
1 - M12–1.75 × 150 MM BOLT, WASHER AND THRUST BEARING
FROM SPECIAL TOOL 6792
TJ
ENGINE 2.4L
9 - 47
FRONT MOUNT
REMOVAL
(1) Raise vehicle on hoist.
(2) Remove the front engine mount through bolt
from the insulator.
(3) Remove the engine front mount bolts and
remove the insulator assembly.
(4) Remove
the
front
mounting
bracket
from
engine, if necessary.
INSTALLATION
(1) Install the insulator mount assembly (Fig.
76)and (Fig. 77).
(2) Tighten the mount to engine bolts.
(3) Loosely install the front engine mount through
bolt to the insulator.
(4) Lower the engine.
(5) Tighten the through bolt.
(6) Lower the vehicle.
Fig. 76 LH ENGINE MOUNT
1 - ENGINE MOUNT
2 - ENGINE MOUNT BOLT (3)
3 - ENGINE MOUNT THROUGH BOLT
Fig. 77 RH ENGINE MOUNT
1 - ENGINE MOUNT BOLT (4)
2 - ENGINE MOUNT THROUGH BOLT
3 - ENGINE MOUNT
9 - 48
ENGINE 2.4L
TJ
REAR MOUNT
REMOVAL
NOTE: A resilient rubber cushion supports the
transmission at the rear between the transmission
extension housing and the rear support crossmem-
ber or skid plate.
(1) Disconnect negative cable from battery.
(2) Raise the vehicle and support the transmission.
(3) Remove the nuts holding the support cushion
to the crossmember. Remove the crossmember.
(4) Remove the support cushion nuts and remove
the cushion.
(5) Remove the transmission support bracket bolts
and remove the bracket from the transmission.
INSTALLATION
(1) Install the support cushion to the transmission
(Fig. 78)or (Fig. 79). Install the bolts and tighten.
(2) Position the crossmember in the vehicle. Install
the crossmember to mount through bolt and nut.
(3) Install crossmember-to-sill bolts and tighten to
41 N·m (30 ft. lbs.) torque.
(4) Remove the transmission support.
(5) Lower the vehicle.
(6) Connect negative cable to battery.
LUBRICATION
DESCRIPTION
The lubrication system is a full-flow filtration,
pressure feed type. The oil pump is mounted in the
front engine cover and driven by the crankshaft.
OPERATION
Engine oil drawn up through the pickup tube and
is pressurized by the oil pump and routed through
the full-flow filter to the main oil gallery running the
length of the cylinder block. A diagonal hole in each
bulkhead feeds oil to each main bearing. Drilled pas-
sages within the crankshaft route oil from main bear-
ing journals to connecting rod journals. Balance shaft
lubrication is provided through an oil passage from
the number one main bearing cap through the bal-
ance shaft carrier support leg. This passage directly
supplies oil to the front bearings and internal
machined passages in the shafts that routes oil from
front to the rear shaft bearing journals. A vertical
hole at the number five bulkhead routes pressurized
oil through a restrictor (integral to the cylinder head
gasket) up past a cylinder head bolt to an oil gallery
running the length of the cylinder head. The cam-
shaft journals are partially slotted to allow a prede-
termined amount of pressurized oil to pass into the
bearing cap cavities. Lubrication of the camshaft
Fig. 78 TRANSMISSION MOUNT - 2.4L MANUAL
TRANS
1 - TRANSMISSION MOUNT
2 - MOUNTING BOLT
Fig. 79 TRANSMISSION MOUNT - 3.7L MANUAL
TRANS 2WD
1 - NUT
2 - BOLT
3 - TRANS MOUNT
TJ
ENGINE 2.4L
9 - 49
lobes are provided by small holes in the camshaft
bearing caps that are directed towards each lobe. Oil
returning to the pan from pressurized components
supplies lubrication to the valve stems. Cylinder
bores and wrist pins are splash lubricated from
directed slots on the connecting rod thrust collars.
DIAGNOSIS AND TESTING
ENGINE OIL PRESSURE CHECKING
(1) Disconnect and remove oil pressure switch.
(Refer to 9 - ENGINE/LUBRICATION/OIL PRES-
SURE SENSOR/SWITCH - REMOVAL)
(2) Install Special Tools C-3292 Gauge with 8406
Adaptor fitting.
(3) Start engine and record oil pressure. Refer to
Specifications for correct oil pressure requirements.
(Refer to 9 - ENGINE - SPECIFICATIONS)
CAUTION: If oil pressure is 0 at idle, do not perform
the 3000 RPM test
(4) If oil pressure is 0 at idle. Shut off engine,
check for pressure relief valve stuck open, a clogged
oil pick-up screen or a damaged oil pick-up tube
O-ring.
(5) After test is complete, remove test gauge and
fitting.
(6) Install oil pressure switch and connector. (Refer
to 9 - ENGINE/LUBRICATION/OIL PRESSURE
SENSOR/SWITCH - INSTALLATION)
OIL
STANDARD PROCEDURE
ENGINE OIL LEVEL CHECK
The best time to check engine oil level is after it
has sat overnight, or if the engine has been running,
allow the engine to be shut off for at least 5 minutes
before checking oil level.
Checking the oil while the vehicle is on level
ground will improve the accuracy of the oil level
reading. Remove dipstick and observe oil level. Add
oil only when the level is at or below the ADD mark
(Fig. 80).
ENGINE OIL AND FILTER CHANGE
Change engine oil at mileage and time intervals
described in the Maintenance Schedule. (Refer to
LUBRICATION
&
MAINTENANCE/MAINTE-
NANCE SCHEDULES - DESCRIPTION)
WARNING: NEW OR USED ENGINE OIL CAN BE
IRRITATING TO THE SKIN. AVOID PROLONGED OR
REPEATED SKIN CONTACT WITH ENGINE OIL.
CONTAMINANTS IN USED ENGINE OIL, CAUSED BY
INTERNAL COMBUSTION, CAN BE HAZARDOUS TO
YOUR HEALTH. THOROUGHLY WASH EXPOSED
SKIN WITH SOAP AND WATER. DO NOT WASH
SKIN WITH GASOLINE, DIESEL FUEL, THINNER, OR
SOLVENTS, HEALTH PROBLEMS CAN RESULT. DO
NOT POLLUTE, DISPOSE OF USED ENGINE OIL
PROPERLY. CONTACT YOUR DEALER OR GOVERN-
MENT AGENCY FOR LOCATION OF COLLECTION
CENTER IN YOUR AREA.
Run engine until achieving normal operating tem-
perature.
(1) Position the vehicle on a level surface and turn
engine off.
(2) Hoist and support vehicle on safety stands.
Refer to Hoisting and Jacking Recommendations.
(Refer to LUBRICATION & MAINTENANCE/HOIST-
ING - STANDARD PROCEDURE)
(3) Remove oil fill cap.
(4) Place a suitable drain pan under crankcase
drain.
(5) Remove drain plug from crankcase and allow
oil to drain into pan. Inspect drain plug threads for
stretching or other damage. Replace drain plug and
gasket if damaged.
(6) Remove oil filter. (Refer to 9 - ENGINE/LUBRI-
CATION/OIL FILTER - REMOVAL)
(7) Install and tighten drain plug in crankcase.
(8) Install new oil filter. (Refer to 9 - ENGINE/LU-
BRICATION/OIL FILTER - INSTALLATION)
(9) Lower vehicle and fill crankcase with specified
type and amount of engine oil. (Refer to LUBRICA-
TION
&
MAINTENANCE/FLUID
TYPES
-
DESCRIPTION)
(10) Install oil fill cap.
(11) Start engine and inspect for leaks.
(12) Stop engine and inspect oil level.
Fig. 80 Oil Level
1 - ENGINE OIL LEVEL DIPSTICK
9 - 50
ENGINE 2.4L
TJ
LUBRICATION (Continued)
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