1997 AUDI A4 01A Transmission Final Drive Gear Set Workshop Manual

39-148


Final drive gear set,
recommended sequence for
adjusting
If the pinion shaft and ring gear have to be re-
adjusted, the following sequence is
recommended for maximum efficiency:
1.) Determine total shim thickness Stotal for S1 +
S2 for the specified tension of the tapered roller
bearing for differential.
2.) Determine total shim thickness S3, so that
pinion shaft obtains the specified installed
position determined by the test machine in
production.
3.) Split up total shim thickness Stotal for S1 +
S2, so that the specified torsional backlash exists
between ring gear and pinion shaft.

Note:
Overview of components and shims Page 39
-
149
.
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39-149
List of adjustments

Note:
If repairs have been carried out on the final drive, it is only necessary to adjust the pinion shaft or final drive set if components
which have a direct effect on the adjustment of the final drive have been replaced. Observe the following table to avoid
unnecessary adjustments:
Component to be adjusted:


Component being replaced: Ring gear
(S1 + S2)1)

Page 39
-162

Pinion shaft
(S3)1)
via deviation "r"
Page 39
-153

Backlash
checking

Page 39
-168

Final drive housing X X X
Differential housing X X
Tapered roller bearing for pinion shaft X X
Tapered roller bearing for differential X X
Final drive gear set2) X X X
Final drive cover X X 1) Shims, installation position Page 39
-150
.
2) Pinion shaft and ring gear, only replace together.
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39-150


Position of shims

Note:
List of adjustments when replacing individual
components of final drive Page 39
-149
.
S1 - Shim for ring gear in final drive cover
S2 - Shim for ring gear in final drive
housing
S3 - Shim for pinion shaft in final drive
housing
Pa
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39-151

Special tools and equipment

VW382/10 extension pin
VW385/1 universal mandrel
VW385/2 centering disc
VW385/3 centering disc
VW385/14 measuring rod
VW385/15 extension pin
VW385/17 measuring plate
VW385/30 master gauge-adjustable
VW385/33 end dimension plate
VW387 dial indicator holder
VW388 measuring lever
VW401 thrust plate
Pa
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gear set, recommended se
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VW402 thrust plate
VW408A punch
VW457 support channels
Pa
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39-152

VW521/4 adjustment for ring gear
VW521/8 adjustment for ring gear
VW540 engine and transmission support
30-205 thrust pad
2003/3 mounting ring
2052/2 assembly tool for pinion shaft
3005 thrust pad
3028 retainer
3062 thrust pad
3253 wheel bearing assembly set with 3253/3
and 3253/4
3304 bracket
VAG1383A engine/transmission
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VAG1359/2 universal mount
Dial indicator extension 30 mm
Dial indicator
Torque gauge 0-600 Ncm (53 in. lb)
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39-153

Pinion shaft, adjusting


Notes:

Adjust the ring gear before adjusting the pinion
shaft (determine total shim thickness Stotal for
shims S1 + S2) Page 39
-162
.

The pinion shaft only has to be readjusted if the
final drive gear set (pinion shaft and ring gear),
tapered roller bearings for pinion shaft or the
final drive housing are replaced. List of
adjustments Page 39
-149
.

Do not additionally oil new tapered roller
bearings for the friction torque measurement.
The bearings have already been treated with a
special oil by the manufacturer.

Determine thickness of shim "S3"
Setting preload of tapered roller bearing for
pinion shaft

- Mount rear final drive to repair stand Page 39
-
110
.

Note: - Install large tapered roller bearing outer race into housing without shim.
Pa
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