2000 AUDI A8 01V Transmission Drive Pinion And Ring Gear Adjust Workshop Manual

- Pry out drive flange seal using tire iron.

- Remove tapered roller bearings for differential
and remove adjustment shims page 39
-136
.
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39-187

- Press tapered roller bearing outer race for left
side of differential housing (housing side)
together with shim "S2" into differential housing
Page 39
-144
. Use a shim "S2*" with a 1.00
mm thickness for measurement purposes (1
shims with 0.80 and 1 with 0.20 mm).

Note:
All measurements are performed with shim S2
with 1.00 mm thickness. The shim will be
indicated by "S2*" in the following procedures.
After determining backlash, S2* is replaced by
final shim S2.

- Press in tapered roller bearing outer race for
right side (cover side) of differential without
adjustment shims to stop Fig. 8
, page 39
-
136
.

- Insert differential in housing. Ring gear is on the
right side (cover side).

- Install cover and tighten bolts to 25 Nm.

- Install VW521/4 locking sleeve and 521/8 sleeve press tool into
differential housing on housing side.
- Rotate cover side of differential housing upward.
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39-188

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

- Place VW385/17 magnetic plate onto
differential.

- Install measuring tools.
A - Dial gauge extension approx. 30 mm long
B - Hex bolt M8 x 45
- Set dial gauge extension onto center of VW 385/17 magnetic plate.
- Set dial indicator (3 mm measuring range) to 0 with 2 mm preload.

Note:
If measurement is repeated, differential must first be rotated 5 complete
revolutions in both directions again to seat tapered roller bearing. - Lift the differential without turning it, read play on dial indicator and
note.

Measured value in the following example: 0.50 mm
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39-189

Formula:
"Stotal"
=
"S2*" + measured value + bearing
preload

Example:

Installed shim(s) "S2*" 1.00
mm
+ Measurement 0.50
mm
+ Bearing preload (constant) 0.30
mm
= Total shim thickness "Stotal"for shims
"S1" + "S2"
1.80
mm
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39-190

Determining thickness of shim "S1*"

Notes:

"S1*" is used for the initial measurement. After
determining backlash, "S1*" is replaced with
final shim "S1".
The total shim thickness "Stotal" remains
unchanged.

Formula:
"S1*"
=
"Stotal" - "S2*"

Example:


Total shim thickness "Stotal"for shims
"S1" + "S2"
1.80
mm
- Installed shim(s) "S2*" 1.00
mm
= Thickness of shim "S1*" 0.80
mm

- Determine adjustment shim(s) as closely as
possible according to table page 39
-195
.
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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
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should now be checked page 39
-177
.
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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.
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