Differential, Adjusting: Notes
Special Tools And Workshop Equipment Required
- Transmission Support:VW353
- Measuring Set - Magnetic Plate - 50mm:VW 385/17
- Dial Gauge Holder:VW387
- Press Plate:VW402
- Press Piece - Rod:VW408A
- Press Piece - Multiple Use:3005
- Press Piece - Bushing:3259
- Bearing Installer - Wheel Bearing:3345
- Torque Wrench 1331 5-50 Nm :VAG1331
- Internal Puller (Kukko 21/7):VAS251615 , or for example the Puller - Kukko Internal - 46-56mm:Kukko 21/7
- Counter Support (Kukko 22/2):VAS251623 , or for example Puller - Kukko Counterstay:Kukko 22/2
- Dial Indicator:VAS6080A
- 30 mm dial gauge extension
A New Differential Adjustment is Required when the following Components have been Replaced:
- Transmission Housing
- Clutch Housing
- Differential housing or
- Differential tapered roller bearing
Adjustment overview. Refer to ADJUSTMENT OVERVIEW .
-- Press the outer race/tapered roller bearing with the shim into the clutch housing. Refer to OVERVIEW - DIFFERENTIAL .
Pay attention to the shim installed position.
The collar on the inner circumference faces the seal.
-- Press the outer race/tapered roller bearing without the shim into transmission housing. Refer to OVERVIEW - DIFFERENTIAL .
-- Insert differential into clutch housing.
-- Mount transmission housing and tighten 5 bolts.
-- Press differential in direction of clutch housing and rotate 8 times at the same time.
-- Press differential in direction of transmission housing and rotate 8 times at the same time.
-- Attach the measuring tools to the transmission housing.
-- Set the dial gauge with 1 mm pretension to "0".
A - 30 mm dial gauge extension
-- Move the differential up and down and read the play on the dial gauge and note it (example: 0.70 mm).
Determining the Shim
The specified bearing pre-load is obtained by adding a constant pre-load figure of 0.25 mm to the reading obtained.
Example:
| Measured value | 0.70 mm |
| + Preload (constant value) | 0.25 mm |
| Shim thickness = | 0.95 mm |
-- Remove the transmission housing.
-- Removing the outer race/tapered roller bearing from the transmission housing
A - :VAS251623 , or for example :22/2
B -:VAS251615 , or for example the :21/7
-- Shim part number. Refer to the Parts Information.
-- Insert shim with the correct thickness.
The following shims are available:
| Shim Thickness (mm) | |||
|---|---|---|---|
| 0.65 | 0.85 | 1.05 | 1.25 |
| 0.70 | 0.90 | 1.10 | |
| 0.75 | 0.95 | 1.15 | |
| 0.80 | 1.00 | 1.20 | |
If the measured shim thickness is larger than those listed in the table, then install two shims that add up to the necessary thickness. Install the thicker shim first.
Tolerance variations make it possible to find the exact shim thickness required.
-- Install the outer race again and tighten the transmission housing. Refer to OVERVIEW - TRANSMISSION HOUSING AND SELECTOR MECHANISM .