Oil Pump Housing

Oil Pump Housing
REMOVAL
Remove the transmission assembly from the vehicle.
Extract the torque converter clutch assembly.
Remove the input shaft.





Lift-up lever behind the transmission harness connector and disconnect it from stay.
Disconnect inhibitor switch connector from stay.
Remove the oil charge pipe.
Remove the oil cooler inlet and outlet pipes.
Separation of converter case and transmission case sections
Separate transmission case and extension case sections.
Remove the reduction drive gear. (MPT model)
Remove the center differential carrier. (VTD model)
Remove the reduction driven gear.
Loosen the oil pump housing mounting bolts.





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.





Remove the oil pump housing and adjusting thrust washer.





(A) Oil pump housing

INSTALLATION
Secure the oil pump housing with two nuts and a bolt.
Tightening torque: 42 Nm (4.3 (kgf-m, 31 ft. lbs.)





(A) Oil pump housing
Install the converter case assembly to the transmission case assembly.
Install reduction driven gear.
Install the reduction drive gear. (MPT model)
Install the center differential carrier. (VTD model)
Combine the extension case with the transmission case, and install vehicle speed sensor 1 (rear).
Insert inhibitor switch and transmission connector into stay.





(A) Transmission harness
(B) Inhibitor switch harness
Install the oil cooler pipe.
Install the oil charge pipe with O-ring.
Insert the input shaft while turning lightly by hand and verify the protrusion amount.
Normal protrusion A: 50 - 55 mm (1.97 - 2.17 inch)





Install the torque converter clutch assembly.
Install the transmission assembly to the vehicle.

DISASSEMBLY
OIL PUMP COVER
Remove four seal rings.





(A) Seal rings
Lightly tap the end of the stator shaft to remove the cover.





(A) Oil pump cover
(B) Oil pump housing
Remove the inner and outer rotor.





(A) Inner rotor
(B) Outer rotor

OIL SEAL RETAINER
Remove the oil seal retainer.





(A) Oil seal retainer
(B) Drive pinion shaft
Remove the O-ring.





(A) O-ring
Remove the oil seal from oil seal retainer.





(A) Oil seal
(B) Oil seal retainer

ASSEMBLY
OIL PUMP COVER
Install oil pump rotor assembly to oil pump housing.





(A) Inner rotor
(B) Outer rotor
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.
Tightening torque: 25 Nm (2.5 kgf-m, 18.1 ft. lbs.)





(A) Oil pump cover
(B) Oil pump housing
After assembling, turn the oil pump shaft to check for smooth rotation of the rotor.
Install the oil seal retainer and new seal rings. After adjusting the drive pinion backlash and tooth contact.





(A) Seal rings (Black)
(B) Seal rings (Brown)

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





(A) Oil seal
(B) Oil seal retainer
Install a new O-ring to the oil seal retainer using Vaseline. Install the seal to oil pump housing bore.





(A) O-ring
Install the oil seal and secure it using three bolts being careful not to damage oil seal lip.
Tightening torque: 7 Nm (0.7 kgf-m, 5.1 ft. lbs.)





(A) Oil seal retainer
(B) Drive pinion shaft

INSPECTION
Check seal ring and O-ring oil seal for breaks or damage.
Check other parts for dents or abnormalities.
Selection of oil pump rotor assembly
Tip clearance
Install inner rotor and outer rotor to oil pump. With rotor gears facing each other, measure crest-to-crest clearance.
Tip clearance: 0.02 - 0.15 mm (0.0008 - 0.0059 inch)

(A) Thickness gauge
(B) Inner rotor
(C) Outer rotor
Side clearance
Set a depth gauge to oil pump housing, then measure oil pump housing-to-rotor clearances.
Side clearance: 0.02 - 0.04 mm (0.0008 - 0.0016 inch)





(A) Depth gauge
(B) Inner rotor
(C) Outer rotor





If depth and/or side clearances are outside specifications, replace rotor assembly.

Oil pump rotor assembly
Part No. Thickness mm (in)

Measure the total end play and adjust to within specifications.








ADJUSTMENT
Using ST, measure the distance from the transmission case mating surface to the recessed portion of the high clutch drum L.
ST 32005073 GAUGE

Using ST, measure the distance from the oil pump housing mating surface to the top surface of the oil pump cover with thrust needle bearing.
ST 32005073 GAUGE

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) - litres

Thrust Needle Bearing (Part 1):

Thrust Needle Bearing (Part 2):

Thrust needle bearing

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.

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.

Install both parts with dowel pins aligned. Make sure no clearance exists at the mating surface.