Oil Pump Housing

Oil Pump Housing

REMOVAL
1) Remove the transmission assembly from vehicle body.
2) Pull out the torque converter assembly.
3) Remove the input shaft.





4) Lift up the lever on the rear side of transmission harness connector, and then remove it from the stay.
5) Remove the inhibitor switch connector from the stay.
6) Remove the oil charge pipe.
7) Remove the ATF inlet and outlet pipes.
8) Separate the converter case and transmission case.
9) Separate the transmission case and extension case section.
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 the rear end facing down.

NOTE:
^ Be careful not to scratch the rear mating surface of the transmission case.
^ Check the height of the wooden blocks to avoid damaging the parking rod protruding from the mating surface, and the drive pinion.





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





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





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

DISASSEMBLY

OIL PUMP COVER
1) Remove the four seal rings.





2) Remove attachment bolts, then remove the cover by lightly tapping the end of the stator shaft.





3) Remove the oil pump inner rotor and outer rotor.





OIL SEAL RETAINER
1) Remove the oil seal retainer.





2) Remove the O-ring.





3) Remove the oil seal from the oil seal retainer.





ASSEMBLY

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





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





3) After assembling, turn the oil pump shaft to check for smooth rotation of rotor.
4) Apply Vaseline to the oil seal retainer and new seal rings, and install them. After installing, adjust the tooth contact with the drive pinion backlash.

NOTE: There are two types of seals. They are identified by color. Install at the proper positions by referring to the figure.





OIL SEAL RETAINER
1) Apply ATF to two new oil seals and install them to the oil seal retainer in the proper direction using the ST.
ST 499247300 INSTALLER





2) Apply ATF to a new O-ring and attach to the oil seal retainer. Install the seal to the oil pump housing bore.





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





INSPECTION
1) Check the seal ring and oil seal for breaks and damage.
2) Check other parts for dents or faults.
3) Oil pump rotor assembly selection
(1) Tip clearance





Install the inner rotor and outer rotor to the oil pump. With rotor gears facing each other, measure the crest-to-crest clearance.
Tip clearance: 0.02 - 0.15 mm (0.0008 - 0.0059 in)
(2) Side clearance
Set a depth gauge to oil pump housing, then measure the oil pump housing-to-rotor clearance.





(3) If the depth and/or side clearance are not within the specification, replace the rotor assembly.





Measure the total end play and adjust it to be within specifications.

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





2) Using the ST, measure the length from the oil pump housing mating surface to the top surface of the oil pump cover with the thrust needle bearing.
ST 398643600 GAUGE
ST 398643600 GAUGE





3) Calculation of total end play
Select a suitable bearing race from the table below so that clearance C will be within 0.25 to 0.55 mm (0.0098 to 0.0217 in).
C = (L + G) - 12











4) After completing the end play adjustment, insert the bearing race into the high clutch race. Apply Vaseline, and install the thrust needle bearing to the oil pump cover.
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 case.
6) Install both parts with dowel pins aligned. Make sure there is no clearance at the mating surface.