Page 22 of 34
39-58
Determining total shim thickness "Stotal" (S1
+ S2)
Adjusting preload of tapered roller bearings for
differential
Pinion shaft removed
Note:
If only the tapered roller bearings for the
differential are being replaced, the ring gear can
be removed from the differential housing. The
pinion shaft does not have to be removed.
- Remove seals and outer races of both tapered
roller bearings for differential.
- Remove shims Page 39
-21
.
Note:
For measurement purposes, a shim S2 of 1.20 mm is initially inserted and
referred to as S2* in the following text. After determining backlash, S2* will
be replaced by the correct shim S2. - Press right tapered roller bearing outer race with shim S2 into
transmission housing Fig. 2, Page 39
-27
. Shim S2* with thickness
of 1.20 mm (two 0.60 mm shims) is used for initial measurement.
Pa
ge 22 of 34 Total shim thickness Stotal for shim S3 + S4, determinin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.TM02.39.7
Page 23 of 34
39-59
- Press tapered roller bearing outer race into differential cover without
shim S1 Fig. 8, Page 39
-31
.
- Insert differential without speedometer gear drive into transmission
housing. Ring gear is positioned on left-hand side infront of final drive
cover.
- Install differential cover with 4 bolts and tighten to 25 Nm (18 ft lb).
- Position transmission so differential cover faces upward.
- Turn differential 5 turns in both directions so tapered roller bearings
settle.
Note:
The tip of the dial indicator must be positioned on the center of the
differential. - Assemble measuring equipment, using 30 mm dial indicator extension.
- Set dial indicator (3 mm measuring range) -A- to "0" with 2 mm
preload.
Pa
ge 23 of 34 Total shim thickness Stotal for shim S3 + S4, determinin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.TM02.39.7
Page 28 of 34
39-63
Measuring backlash
Position of ring gear in transmission housing
Pinion shaft with shims S3* and S4* installed
- Install differential.
- Turn differential 5 turns in each direction to
settle tapered roller bearings.
- Secure VW387 dial indicator holder onto housing.
- Attach VW521/4 locking sleeve and VW521/12.
- Install dial indicator and VW382/10 extension pin (6 mm flat).
- Adjust VW388 measuring lever to dimension -a-:
Distance -a-: 67 mm (2.637 in.) for 170 mm (6.693 in.) diameter ring
gear.
- Determine play between teeth flanks as follows:
- Turn ring gear until it makes contact with tooth flank (end of backlash
travel).
- Set dial indicator to "0" with 2 mm preload.
- Turn ring gear back against opposite tooth flank (backlash).
Pa
ge 28 of 34 Total shim thickness Stotal for shim S3 + S4, determinin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.TM02.39.7
