Rear Drive Pinion

COMPONENT NOTES AND INFORMATION

NOTE:
^ Refer to general repair instructions.
^ Replace both differential tapered roller bearings together as a set. Use the same make bearings if possible.

1 Final drive housings
- If these parts are replaced, adjustments are required, refer to Final Drive Assembly. Adjustments
- Clamping final drive in repair stand, refer to Fig. 1, below.
2 Drive pinions
- If these parts are replaced, adjustments are required, refer to Final Drive Assembly. Adjustments
- Matched with ring gear
3 Inner race for large tapered roller bearings
- If these parts are replaced, adjustments are required, refer to Final Drive Assembly. Adjustments
- Pressing off, refer to Fig. 8, below.
- Pressing on, refer to Fig. 9, below.
4 Outer race for large tapered roller bearings
- If these parts are replaced, adjustments are required, refer to Final Drive Assembly. Adjustments
- Removing, refer to Fig. 7, below.
- Installing, refer to Fig. 10, below.
5 Shim S3
- Note thickness
- List of adjustments. Adjustments
6 Spacer sleeve
- Always replace
7 Outer race for small tapered roller bearings
- If these parts are replaced, adjustments are required, refer to Final Drive Assembly. Adjustments
- Removing, refer to Fig. 6, below.
- Installing, refer to Fig. 11, below.
8 Inner race for small tapered roller bearing
- If these parts are replaced, adjustments are required, refer to Final Drive Assembly. Adjustments
- Pressing out drive pinion, refer to Fig. 5, below.
- Installing, refer to Fig. 12, below.
9 Seal
10 Driveshaft flange with final drive cover
- Removing, refer to Fig. 2, below.
- Disassembling and assembling, refer to Driveshaft (Input) Flanged Shaft, Seal and/or Bearing.
11 Drive pinion nut
- Removing, refer to Figs. 3 and 4, below.
- Installing, refer to Figs. 3 and 13, below.
- Measuring friction torque, refer to Fig. 14, below.
- Securing, refer to Fig. 15, below.
12 Screws
- Tighten to: 25 Nm (18 ft lb)

PROCEDURES





Fig. 1 Clamping final drive in repair stand





Fig. 2 Pulling cover off final drive
- (-A-) 8/10 mm bolts





Fig. 3 Tool for loosening and tightening drive pinion nut
- (-A-) Extension and 32 mm socket wrench





Fig. 4 Loosening drive pinion nut
- The final drive must be supported (e.g. with VAG 1383 A) when loosening the drive pinion nut otherwise the tapped holes for the bracket will be damaged.





Fig. 5 Pressing drive pinion out of small tapered roller bearing





Fig. 6 Removing outer race for small tapered roller bearing
- (-A-) Internal puller, commercially available, 6 to 46 mm (e.g. Kukko 21/7)
- (-B-) Spindle from counter-support Kukko 22/1





Fig. 7 Removing outer race for large tapered roller bearing





Fig. 8 Pressing tapered roller bearing off drive pinion
- (-A-) Separating device, 22 to 115 mm (e.g. Kukko 17/2)





Fig. 9 Pressing tapered roller bearing onto drive pinion
- Heat to approx. 100°C (212°F) before pressing on.





Fig. 10 Installing outer race for large tapered roller bearing
- First install shims for drive pinion.





Fig. 11 Installing outer race for small tapered roller bearing





Fig. 12 Installing tapered roller onto drive pinion
- First install drive pinion and new spacer sleeve.
- Heat bearing to approx. 100°C (212°F) before installing.
- Push drive pinion up and place rod 3114 centered onto the drive pinion.





Fig. 13 Tightening drive pinion nut and adjusting friction torque
- Measuring friction torque, refer to Fig. 14, below.
The final drive must be supported (e.g. with VAG 1383 A) when tightening the drive pinion nut otherwise the tapped holes for the bracket will be damaged.





Fig. 14 Measuring friction torque
- (-A-) Torque gauge, commercially available, 0-600 Ncm (approx. 0-50 inch lb)
- (-B-) Extension with 32 mm socket wrench

CAUTION:
^ Slowly increase tightening torque and read friction torque value several times when doing so.
^ If the specified friction torque is exceeded, the spacer sleeve must be replaced and the adjustment repeated.
^ A sleeve that has been compressed cannot be reused.





- The above friction torques should be set.





Fig. 15 Securing drive pinion nut
- Drift for securing nut is installed through oil drain hole.