Determine total shim thickness "Stotal" (S1 plus S2)
WARNING: This page is about a different car, the 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
(Setting preload of taper roller bearing for differential)
- Drive pinion is removed.
- Pull out flanged shaft seal with VW 681.
- Remove outer races of differential taper roller bearings and remove shims. Refer to Differential, disassembling and assembling .
- Drive outer race for taper roller bearing with shim S2 into transmission housing. For measurement purposes use a 1.20 mm thick S2* shim (2 shims of 0.60 mm).
NOTE:
For measurement purposes a shim S2 with a thickness of 1.20 mm is inserted provisionally. It is referred to as S2* in the following. After determining the backlash, S2* is replaced by the final shim S2.
- Press taper roller bearing outer race without shim into cover for differential.
- Insert differential into housing without speedometer trigger wheel.
The side of the ring gear is positioned on the right side (cover side).
- Install cover and tighten bolts to 25 Nm.
- Turn transmission so that cover for differential faces up.
- Turn differential 8 turns in both directions so that the taper roller bearings settle.
- Place measuring plate VW 385/17 onto differential.
- Install measuring tools.
- Position dial gauge extension in middle of measuring plate VW 385/17.
- Set dial gauge (3 mm measuring range) to zero with 2 mm preload.
A - Dial gauge extension 30 mm
- Move differential up and down with special tool VW 521 (direction of arrow).
- Read off play from dial gauge
Example:
0.62 mm
"Stotal" = S2* + reading obtained + pre load
Example:
| Inserted shim(s) S2* | 1.20 mm | |
| Reading obtained (Example) | +0.62 mm | |
| Pre-load (constant value) | +0.25 mm | |
| Stotal | = 2.07 mm | |