Oil Pump Housing

Oil Pump Housing

REMOVAL
1) Remove the transmission assembly from the vehicle.
2) Extract the torque converter clutch assembly.
3) Remove the input shaft.





4) Lift-up lever behind the transmission harness connector and disconnect it from stay.
5) Disconnect inhibitor switch connector from stay.
6) Remove the oil charge pipe.
7) Remove the ATF oil cooler inlet and outlet pipes.
8) Separation of converter case and transmission case sections
9) Separate transmission case and extension case sections.
10) Remove the reduction drive gear. (MP-T model)
11) Remove the center differential carrier. (VTD model)
12) Remove the reduction driven gear.
13) Loosen the oil pump housing mounting bolts.





14) Place two wooden blocks on the workbench, and stand the transmission case with its rear end facing down.

NOTE:
^ Be careful not to scratch the rear mating surface of the transmission case.
^ Note that the parking rod and drive pinion protrude from the mating surface.





15) Remove the oil pump housing and adjusting thrust washer.





INSTALLATION
1) Secure the oil pump housing with two nuts and a bolt.





2) Install the converter case assembly to the transmission case assembly.
3) Install reduction driven gear.
4) Install the reduction drive gear. (MP-T model)
5) Install the center differential carrier. (VTD model)
6) Combine the extension case with the transmission case, and install rear vehicle speed sensor.
7) Insert inhibitor switch and transmission connector into stay.





8) Install the ATF cooler pipe.
9) Install the oil charge pipe with O-ring.
10) Insert the input shaft while rotating it lightly by hand, and then check the protrusion amount.





11) Install the torque converter clutch assembly.
12) Install the transmission assembly to the vehicle.

DISASSEMBLY

OIL PUMP COVER
1) Remove four seal rings.





2) Lightly tap the end of the stator shaft to remove the cover.





3) Remove the inner and outer rotor.





OIL SEAL RETAINER
1) Remove the oil seal retainer.





2) Remove the O-ring.





3) Remove the oil seal from oil seal retainer.





ASSEMBLY

OIL PUMP COVER
1) Install oil pump rotor assembly to oil pump housing.





2) Align both pivots with the pivot holes of the cover, and install the oil pump cover being careful not to apply undue force to the pivots.





3) After assembling, turn the oil pump shaft to check for smooth rotation of the rotor.
4) Install the oil seal retainer and new seal rings. After adjusting the drive pinion backlash and tooth contact.





OIL SEAL RETAINER
1) Install two new oil seals to the oil seal retainer in proper position using ST.
ST 499247300 INSTALLER





2) Install a new O-ring to the oil seal retainer using Vaseline. Install the seal to oil pump housing bore.





3) Install the oil seal and secure it using three bolts being careful not to damage oil seal lip.





INSPECTION
1) Check seal ring and O-ring oil seal for breaks or damage.
2) Check other parts for dents or abnormalities.
3) Selection of oil pump rotor assembly
(1) Tip clearance Install inner rotor and outer rotor to oil pump. With rotor gears facing each other, measure crest-to-crest clearance.





(2) Side clearance Set a depth gauge to oil pump housing, then measure oil pump housing-to-rotor clearances.





(3) If depth and/or side clearances are outside specifications, replace oil pump rotor assembly.





Measure the total end play and adjust to within specifications.

ADJUSTMENT
1) Using the ST, measure the distance from the end surface of ST to the recessed portion "L" of the high clutch drum.
ST 398643600 GAUGE





2) Using the ST, measure the distance from the oil pump housing mating surface to the end surface of ST.
ST 398643600 GAUGE





3) Calculation of total end play
Select suitable bearing race from among those listed in this table so that clearance C is in the 0.25 to 0.55 mm (0.0098 to 0.0217 inch) range.
C = (L+G)-l











4) After completing end play adjustment, insert the bearing race in the recess of the high clutch. Attach the thrust needle bearing to the oil pump cover with Vaseline.
5) After correctly installing the new gasket to the case mating surface, carefully install the oil pump housing assembly. Be careful to avoid hitting the drive pinion against the inside of the case.
6) Install both parts with dowel pins aligned. Make sure no clearance exists at the mating surface.