Pinion Bearing: Service and Repair

Drive Pinion Front Bearing
This is a "Trustmark Authoring Standards (TAS) Repair Procedure"
- TAS style procedures can be identified by steps that have no accompanying step text and the magenta color of the electrical connectors and fasteners such as nuts, bolts, clamps or clips.
- TAS removal and installation procedures use a sequence of color illustrations to indicate the order to be followed when removing/disassembling or installing/assembling a component.
- Many of the TAS procedures will have the installation information within the removal steps.
- The TAS color illustrations use a variety of symbols to indicate important details of the procedures. It is important to understand these symbols in order to properly used the TAS procedures.
Refer to How to Use TAS Procedures and TAS Symbol Glossary at Vehicle | Description and Operation for additional information on these TAS procedures.
For additional information, refer to How to Use TAS Procedures How to Use TAS Procedures

Removal
1 Raise and support the vehicle.
2 Drain the differential fluid.
For additional information, refer to Differential Draining and Filling Rear Drive Axle/Differential
3 Remove the rear differential.
For additional information, refer to Differential Case Differential Case




4 Remove the differential casing bolts.




5 Remove the differential
case.




6 Remove and discard the differential case seal.




7 Remove the crown wheel assembly.




8 Position the differential assembly in a suitable vice as shown.





CAUTION: Make sure the pinion seal recess is not damaged as the seal is removed.
9 Using the special tool remove the pinion shaft oil seal.





WARNING: High torque application.

CAUTION: Do not use air tools or heat to remove the nut (as this could contaminate the head bearing). Failure to follow this instruction may result in damage to the component.

NOTE:
The special tool should be turned clockwise to remove the pinion shaft nut.

10 Using the special tools remove the pinion shaft nut.




Secure the differential casing to the special tool.
Position the support bolt to its lowest setting.





CAUTION: Twisting or damage to the casing may occur if the base plates to support the jig on the press are not used.

11 Using a suitable press remove the differential pinion shaft.





12 Remove and discard the pinion shaft collapsible spacer.





13 Remove the tail bearing inner race.





14 Using the special tools remove the pinion shaft tail bearing outer race.

CAUTION: It is essential that absolute cleanliness is observed when working on the rear differential. Always cover any open orifices using lint free non-flocking material to prevent the ingress of foreign matter. Failure to follow this instruction may result damage to the components.
Remove the differential from the supporting tool.
Thoroughly clean the pinion shaft paying particular attention to the thread.
Using a suitable cleaning fluid thoroughly clean the differential casings.

Installation






CAUTION: Do not clean or lubricate the new pinion shaft tail bearing, as it is supplied coated with a low friction oil. Failure to follow this instruction will require the pinion shaft tail bearing to be replaced before the differential can be successfully assembled.
Secure the differential casing to the special tool.
Using a suitable press and the special tool install the pinion shaft tail bearing outer race.




1 Install the new pinion shaft spacer.




Install the pinion shaft to the differential case.
Lubricate the pinion head bearing with differential oil.
Position the support bolt to its highest setting.





CAUTION: Do not clean or lubricate the new pinion shaft tail bearing, as it is supplied coated with a low friction oil. Failure to follow this instruction will require the pinion shaft tail bearing to be replaced before the differential can be successfully assembled.
2 Using a suitable press and the special tool install the pinion shaft tail bearing inner race.




Position the differential assembly in a suitable vice as shown.
Remove the differential from the supporting tool.





WARNING: High torque application.

CAUTION: The special tool should be turned counter clockwise to install the pinion shaft nut.

CAUTION: Do not use air tools to install the nut. Failure to follow this instruction may result in damage to the component.

NOTE:
250 Nm (184 lb.ft) is the minimum torque requirement to begin collapsing the pinion shaft spacer.
Using the special tools install the new pinion nut.
Tighten to 250 Nm (184 lb.ft).





CAUTION: Make sure the specified torque to rotate the pinion shaft is not exceeded. If excess preload is applied to the joint the pinion shaft should be removed and a new collapsible spacer, pinion shaft tail bearing, pinion shaft tail bearing cup and pinion nut must be installed.

CAUTION: The special tool should be rotated at 60 rpm (1x revolution per second) to produce a consistent reading.

CAUTION: The pinion shaft should be rotated through two full revolutions by hand before the torque measurement is performed.
Using the special tool, check the torque required to rotate the pinion shaft. The specified torque is 1.1 Nm +/- 0.2 Nm
If the specified torque to rotate the pinion shaft is not reached, using the special tools, tighten the pinion flange nut in one degree increments and check the rotational torque after each until the specified torque of 1.1 Nm +/-0.2 Nm is achieved.





CAUTION: Do not lubricate the pinion oil seal.
3 Using a suitable press, the special tool and adapter install the pinion bearing oil seal.




4 Install the crown wheel assembly.





CAUTION: Make sure the mating faces are clean, failure to follow this instruction may result in damage to the differential.

CAUTION: Make sure the new seal is not twisted when fitting, failure to follow this instruction may result in damage to the differential.
Install the differential case seal.
Apply a thin amount of clean differential oil to the new differential casing seal.




Install the differential casing bolts.
Tighten the 7 bolts to 29 Nm.
5 Install the rear differential.
For additional information, refer to Differential Case Differential Case
6 Fill the differential case with fluid.
For additional information, refer to Differential Draining and Filling Rear Drive Axle/Differential