Oil Pump Housing

Oil Pump Housing

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





4) Lift up the lever on the rear side of transmission harness connector, and then disconnect it from the stay.
5) Disconnect the inhibitor switch connector from the stay.
6) Remove the oil charger 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.
Tightening torque: 42 N-m (4.3 kgf-m, 31 ft-lb)





2) Install the converter case to the transmission case.
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.
7) Insert the inhibitor switch and transmission harness connector onto the stay.





8) Install the ATF cooler pipe.
9) Install the oil charger pipe along with the O-ring.
10) Insert the input shaft while rotating it lightly by hand, and then check the amount of protrusion.
Normal protrusion A: 50 - 55 mm (1.97 - 2.17 in)





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

DISASSEMBLY

OIL PUMP COVER
1) Remove the four seal rings.





2) Remove the installation bolt. Then remove the cover by lightly tapping the end of stator shaft.





3) Remove the oil pump inner and outer rotors.





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.
Tightening torque: 25 (2.5 kgf-m, 18.4 ft-lb)





3) After assembling, turn the oil pump shaft to check for smooth rotation of rotor.
4) Install the oil seal retainer and new seal rings. 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) Install two new oil seals to the oil seal retainer in the proper direction using the ST.
ST 499247300 INSTALLER





2) Apply ATF to the new O-ring, and attach to the oil seal retainer.





3) Install the oil seal being careful not to damage oil seal lip, and secure it using three bolts.
Tightening torque: 7 N-m (0.7 kgf-m, 5.1 ft-lb)





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 oil pump 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 the oil pump housing, then measure the oil pump housing-to-oil pump rotor clearance.
Side clearance: 0.02 - 0.04 mm (0.0008 - 0.0016 in)





3) If the depth and side clearance are out of specification, replace the oil pump rotor assembly.





Inspect the total end play, and adjust it to be within the standard value.

ADJUSTMENT
1) Measure the distance "L" from the end of ST to the high clutch drum concave section using the ST.
ST 398643600 GAUGE





2) Measure the distance from the oil pump housing mating surface to the end surface of the ST using the ST.
ST 398643600 GAUGE





3) Calculation of total end play
Select the suitable thrust needle bearing 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 in the high clutch race. Apply Vaseline to install the thrust needle bearing to 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.