Jeep Grand Cherokee WK. Manual — part 1509
OPERATION
When the engine is running, the oil is pumped through
the inlet chamber (5) along the upper and lower side
of the crescent (1) to the pressure chamber (6) of the
housing. The meshing of the teeth prevents oil flowing
from the delivery side to the intake side. An external
gear (3) is eccentrically mounted in the pump housing.
The external gear is driven by the internal gear (4)
which is connected to the torque converter hub.
DISASSEMBLY
1. Remove pump gears (1 and 2) from pump housing.
2. Remove the inner oil pump seal (1).
3. Replace the outer oil pump O-ring (2).
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INSPECTION
Before measuring any oil pump components, perform a thorough visual inspection of all the components. If any sign
of scoring, scratches, or other damage is seen, replace the oil pump as an assembly.
SIDE CLEARANCE
Side clearance is the difference between the thickness of the pump gears and the depth of the pocket in the pump
housing. Side clearance can be measured by laying a flat plate across the mounting face of the pump housing, and
measuring the distance between the plate and the gears.
Acceptable side clearance:
•
Inner gear: 0.064 mm (0.0025 in) max
•
Outer gear: 0.069 mm (0.0027 in) max
TIP CLEARANCE
Tip clearance is the difference between the tip diame-
ters of the gear teeth and the corresponding diameters
of the pocket in the pump housing.
Tip clearance for the inner gear can be checked by
moving the inner gear into tight mesh (2) with the
outer gear as shown. Clearance between the ID of the
crescent feature of the housing and the OD of the
teeth of the inner gear (3) should then me measured
at a point 37 mm from the corner of the crescent (1)
feature, as shown below.
Acceptable tip clearance for inner gear:
•
0.85 mm (0.033 in) max
ASSEMBLY
1. Install new inner oil pump seal (1) with Seal
Installer 8902-A.
2. Replace O-ring (2).
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3. Lubricate pump gears and place in the pump hous-
ing. Insert pump gear (1) so that the chamfer
(arrow) points towards the pump housing.
BEARING-OUTPUT SHAFT
REMOVAL
1. Raise and support vehicle.
2. For 2WD transmissions:
a. Remove the propeller shaft (Refer to 3 - DIFFERENTIAL & DRIVELINE/PROPELLER SHAFT/PROPELLER
SHAFT - REMOVAL).
b. Remove the nut holding the propeller shaft flange to the output shaft and remove the flange.
3. For 4WD transmissions:
a. Remove the transfer case (Refer to 21 - TRANSMISSION/TRANSFER CASE - REMOVAL).
b. Remove the bolts holding the transfer case adapter housing onto the transmission case.
c. Remove the transfer case adapter housing from the transmission case.
d. Remove the bolt holding the output shaft extension to the output shaft.
e. Remove the output shaft extension from the output shaft.
4. Remove the transmission rear oil seal with a suit-
able slide hammer and screw.
5. Remove the transmission output shaft washer. Be
sure to tag the washer since it is very similar to the
geartrain end-play shim and they must not be inter-
changed.
6. Remove the transmission rear output shaft bearing
retaining ring (1).
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7. Position Bearing Remover 9082 (1) over the inner
race of the output shaft bearing (3).
8. Slide the collar (3) on the Bearing Remover 9082
(1) downward over the fingers of the tool.
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