1999 AUDI A8 differential

39-191

Measuring friction torque (check
measurement)

Drive pinion removed
Differential installed with shims "S1*" and
"S2*"

Friction torque specified values: 1) have been run in at least 50 km
Notes: - Position torque gauge 0 to 600 Ncm -A- on differential.
- Read friction torque.New bearings
Run-in bearings
1)
150 to 300 Ncm 30 to 60 Ncm
Tapered roller bearings for differential are low-friction bearings.
Therefore friction torque can only be used for check measurement in a
limited way. A correct adjustment is only possible by determining the
total thickness "Sges". Do not grease new tapered roller bearings additionally for friction
torque measurement. The bearings are already greased with a special
oil from the factory. For a new adjustment of the gear set, the drive pinion adjustment
Pa
ge 30 of 38 Drive
pinion and rin
g gear, ad
justin
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.AT01.39.15

39-192

Adjusting backlash
(position of ring gear in transmission housing)

Drive pinion installed with shim S3
Differential installed with shims "S1*" and
"S2*"

- Insert differential into final drive housing, install
cover and tighten all bolts to 25 Nm.

- Turn differential 5 rotations in each direction to
seat the tapered roller bearing.

- Install measuring tools.
- Use VW382/10 extension pin, 6 mm.
- Set VW388 measuring lever to dimension "a" = 60 mm.
- Determine backlash between teeth flanks as follows:
- Turn ring gear until it contacts a tooth flank (end of backlash travel).
- Set dial indicator to 0 with 1 mm preload.
Pa
ge 32 of 38 Drive
pinion and rin
g gear, ad
justin
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.AT01.39.15

39-196


Checking measurement
Notes:
Drive pinion installed with shim S3 Differential installed with shims "S1" and "S2"
- Turn differential 5 rotations in each direction to seat the tapered roller
bearing.
- Measure backlash 4 times on circumference.

Specification: 0.12 to 0.22 mm
If backlash is outside tolerance, repeat adjustments. Do not change
total shim thickness "Stotal" while doing so. The individual measurement values can deviate a maximum of 0.06
mm from each other
Pa
ge 38 of 38 Drive
pinion and rin
g gear, ad
justin
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.AT01.39.15