Jeep Wrangler TJ. Manual — part 434
NOTE: Care should be exercised when disposing
used engine oil after it has been drained from a
vehicle engine. Refer to the WARNING listed above.
OIL FILTER
DESCRIPTION
The engine oil filter is a high quality full-flow, dis-
posable type. Replace the oil filter with a Mopar
t or
the equivalent.
REMOVAL
(1) Raise vehicle on hoist.
(2) Position an oil collecting container under oil fil-
ter location.
CAUTION:
When
servicing
the
oil
filter
avoid
deforming the filter can by installing the remove/in-
stall tool band strap against the can to base lock
seam. The lock seam joining the can to the base is
reinforced by the base plate.
(3) Using a suitable filter wrench, turn oil filter
counterclockwise to remove (Fig. 81).
INSTALLATION
(1) Clean and check filter mounting surface. The
surface must be smooth, flat and free of debris or
pieces of gasket.
(2) Lubricate new oil filter gasket with clean
engine oil.
(3) Screw oil filter on until the gasket contacts
base. Tighten to 21 N·m (15 ft. lbs.).
OIL PAN
REMOVAL
(1) Remove air cleaner assembly.
(2) Raise vehicle on hoist and drain engine oil.
(3) Loosen the engine mount thru bolts.
(4) Disconnect exhaust pipe at manifold.
(5) Remove structural collar, if equipped.
(6) Remove front axle mounting bolts, and lower
axle as far possible, if equipped.
(7) Position Special Tool 8534 on fender lip and
align the slots in the brackets with the fender
mounting holes.
(8) Secure brackets to the fender using four M6 X
1.0 X 25 MM flanged cap screws.
(9) Tighten the thumbscrews to secure the sleeves
to the support tube.
(10) Secure the support tube in an upright posi-
tion.
(11) Assemble the flat washer, thrust bearing,
hook and T handle.
(12) Using the M10 X 1.5 X 40 mm capscrew sup-
plied with the support fixture, secure the chain to
the front cover and the hook.
(13) Support engine as needed.
(14) Remove oil pan attaching bolts.
(15) Remove oil pan.
(16) Clean oil pan and all gasket surfaces.
Fig. 81 2.4 OIL FILTER
TJ
ENGINE 2.4L
9 - 51
OIL (Continued)
INSTALLATION
(1) Install the oil pan gasket to the block.
(2) Apply a 3MM (1/8 inch) bead of Mopar
t Engine
RTV at the oil pump to engine block parting line
(Fig. 82).
(3) Install pan and tighten the screws to 12 N·m
(105 in. lbs.).
(4) Lower engine, and remove Special Tool 8534.
(5) Tighten engine mount thru bolts.
(6) Raise the front axle into position, and reinstall
front axle mounting bolts. If equipped.
(7) Reconnect exhaust pipe to manifold.
(8) Install structural collar, if equipped.
(9) Lower vehicle.
(10) Fill engine crankcase with proper oil to cor-
rect level.
(11) Reinstall air cleaner assembly.
OIL PRESSURE SENSOR/
SWITCH
DESCRIPTION
The 3–wire, electrical/mechanical engine oil pres-
sure sensor (sending unit) is located in an engine oil
pressure gallery.
OPERATION
The oil pressure sensor uses three circuits. They
are:
• A 5 volt power supply from the Powertrain Con-
trol Module (PCM)
• A sensor ground through the PCM’s sensor
return
• A signal to the PCM relating to engine oil pres-
sure
The oil pressure sensor has a 3 wire electrical
function very much like the Manifold Absolute Pres-
sure (MAP) sensor. Meaning different pressures
relate to different output voltages.
A 5 volt supply is sent to the sensor from the PCM
to power up the sensor. The sensor returns a voltage
signal back to the PCM relating to engine oil pres-
sure. This signal is then transferred (bussed) to the
instrument panel on either a CCD or PCI bus circuit
(depending on vehicle line) to operate the oil pressure
gauge and the check gauges lamp. Ground for the
sensor is provided by the PCM through a low-noise
sensor return.
OIL PUMP
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove timing belt. (Refer to 9 - ENGINE/
VALVE
TIMING/TIMING
BELT/CHAIN
AND
SPROCKETS - REMOVAL)
(3) Remove timing belt rear cover. (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT / CHAIN
COVER(S) - REMOVAL)
(4) Remove oil pan. (Refer to 9 - ENGINE/LUBRI-
CATION/OIL PAN - REMOVAL)
(5) Remove
crankshaft
sprocket
using
Special
Tools 6793 and C-4685-C2 (Fig. 83).
(6) Remove crankshaft key (Fig. 84).
(7) Remove oil pick-up tube.
(8) Remove oil pump (Fig. 85) and front crankshaft
seal.
Fig. 82 OIL PAN GASKET INSTALLATION
1 - SEALER LOCATION
Fig. 83 Crankshaft Sprocket - Removal
1 - SPECIAL TOOL 6793
2 - SPECIAL TOOL C-4685–C2
3 - CRANKSHAFT SPROCKET
9 - 52
ENGINE 2.4L
TJ
OIL PAN (Continued)
DISASSEMBLY
(1)
To remove the relief valve, proceed as follows:
(a) Remove the threaded plug and gasket from
the oil pump.
(b) Remove spring and relief valve.
(2) Remove oil pump cover fasteners, and lift off cover.
(3)
Remove pump rotors.
(4)
Wash all parts in a suitable solvent and
inspect carefully for damage or wear.
CLEANING
(1) Clean all parts thoroughly in a suitable sol-
vent.
INSPECTION
(1) Inspect the mating surface of the oil pump.
Surface should be smooth. Replace pump cover if
scratched or grooved.
(2) Lay a straightedge across the pump cover sur-
face (Fig. 86). If a 0.025 mm (0.001 in.) feeler gauge
can be inserted between cover and straight edge,
cover should be replaced.
(3) Measure thickness and diameter of outer rotor.
If outer rotor thickness measures 9.40 mm (0.370 in.)
or less (Fig. 87), or if the diameter is 79.95 mm
(3.148 in.) or less, replace outer rotor.
Fig. 86 Checking Oil Pump Cover Flatness
1 - STRAIGHT EDGE
2 - FEELER GAUGE
3 - OIL PUMP COVER
Fig. 87 Measuring Outer Rotor Thickness
Fig. 84 Crankshaft Key
1 - CRANKSHAFT KEY
Fig. 85 2.4L OIL PUMP
1 - BOLTS
2 - BOLTS
TJ
ENGINE 2.4L
9 - 53
OIL PUMP (Continued)
(4) If inner rotor measures 9.40 mm (0.370 in.) or
less replace inner rotor (Fig. 88).
ASSEMBLY
(1) Assemble pump, using new parts as required.
Install the inner rotor with chamfer facing the
cast iron oil pump cover.
(2)
Prime oil pump before installation by filling
rotor cavity with engine oil.
(3)
Install cover and tighten fasteners to 12 N·m
(105 in. lbs.).
CAUTION: Oil pump pressure relief valve must be
installed correctly or serious engine damage may
occur.
(4)
Install relief valve, spring, gasket and cap.
Tighten cap to 41 N·m (30 ft. lbs.).
INSTALLATION
(1) Make sure all surfaces are clean and free of oil
and dirt.
(2) Apply Mopar
t Gasket Maker to oil pump as
shown in (Fig. 89). Install O-ring into oil pump body
discharge passage.
(3) Prime oil pump with engine oil before installa-
tion.
(4) Align oil pump rotor flats with flats on crank-
shaft. Install the oil pump to the block.
CAUTION: To align, the front crankshaft seal MUST
be out of pump, or damage may result.
(5) Install new front crankshaft seal using Special
Tool 6780 (Fig. 90).
(6) Install crankshaft key (Fig. 84).
Fig. 88 Measuring Inner Rotor Thickness
Fig. 89 Oil Pump Sealing - Typical
1 - O-RING
2 - SEALER LOCATION
Fig. 90 Front Crankshaft Seal - Installation
1 - PROTECTOR
2 - SEAL
3 - SPECIAL TOOL 6780
9 - 54
ENGINE 2.4L
TJ
OIL PUMP (Continued)
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