AUDI S4 1995 B5 / 1.G 01E Transmission Final Drive Pinion And Ring Gear Adjustment Workshop Manual

39-146


Drive pinion and ring gear,
adjusting

Note:

Careful adjustment of the drive pinion and ring
gear is important for the service life and smooth
running of the final drive. For this reason, the
drive pinion and ring gear are matched together
during manufacture, and checked to ensure a
good mesh pattern and quiet running in both
directions of rotation. The position of quietest
running is found by moving the drive pinion in
an axial direction and at the same time lifting
the ring gear out of the zero-play mesh position
by the amount necessary to maintain the
backlash within the specified tolerance.
The object of the adjustment is to reproduce the
setting for quietest possible running, as
obtained on the test machine in production.
The deviation (tolerance) "r," which is related to
the master gauge "Ro" is measured for the final
drive sets supplied as replacement parts and
marked on the outer circumference of the ring
gear. The final drive set (drive pinion and ring
gear) may only be replaced together as a
matched pair.
Observe the general repair instructions for
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tapered roller bearings and shims.
Maximum care and cleanliness are essential for
achieving good results when performing repairs
and taking measurements.
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39-147


Gear sets, adjusting and marking

1 -
Identification "0937" signifies Oerlikon
gear set with a ratio of 37:9.
2 -
Gear set pairing number (312).
3 -
Deviation (tolerance) "r" is based on the
test machine master gauge used in the
production. The deviation "r" is always
given in 1/100 mm. Example: "25"
signifies r = 0.25 mm
Ro - Length of master gauge used for test
machine "Ro."
Ro - Ring gear = 57.50 mmPa
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39-148


R - Actual distance between center axis of
ring gear and face of drive pinion at
point with quietest running for this gear
set. R = Ro + r
Vo - Hypoid offset
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39-149

Readjusting final drive set,
recommended sequence

The following work sequence is recommended to
save time when the drive pinion and ring gear
have to be adjusted:

1.) Determine total shim thickness "S
total
" for
"S1" + "S2" for the specified preload for
tapered roller bearings for differential.
2.) Determine total shim thickness "S3" to
reproduce the installation position for the
drive pinion determined on the test machine
in production.
3.) Distribute total shim thickness "S
total
" for "S1"
+ "S2" so that the specified backlash exists
between ring gear and drive pinion.

Note:
Overview of components and shims Page 39
-
151
.
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39-150
Adjustment overview

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

adjustment required:

Part replaced:

Ring gear
"S1"+"S2"
1)

Page 39
-163

Drive pinion
"S3"
1)
via deviation "r"
Page 39-154

Check backlash


Page 39
-169

Final drive housing X X X
Differential housing X X
Tapered roller bearing for drive pinion X X
Tapered roller bearing for differential X X
Final drive set
2)
X X X
Cover for final drive X X
1) Shims; installation position Page 39
-151
.
2) Drive pinion and ring gear; only replace together.
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39-151


Shims, position

Note:
Adjustment overview when replacing individual
components of final drive Page 39
-150
.
S1 - Adjustment shim for ring gear in cover
for final drive
S2 - Adjustment shim for ring gear in final
drive housing
S3 - Adjustment shim for drive pinion in
final drive housing
Pa
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39-152

Special tools, testers and auxiliary items

Dial gauge extension VW 382/10
Universal mandrel VW 385/1
Centralizing disc VW 385/2
Centralizing disc VW 385/3
Measuring plunger VW 385/14
Dial gauge extension VW 385/15
Measuring plate VW 385/17
Master gauge VW 385/30
End dimension plate VW 385/33
Universal dial gauge bracket VW 387
Measuring lever VW 388
Press plate VW 401
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Press plate VW 402
Press tool VW 408 A
Support rails VW 457
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pinion and rin
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39-153

Ring gear adjusting appliance VW 521/4
Ring gear adjusting appliance VW 521/8
Engine and transmission support VW 540
Thrust plate 30-205
Installing ring 2003/3
Pinion assembly appliance 2052/2
Thrust plate 3005
Retainer 3028
Thrust pad 3062
Fitting appliance 3253 with 3253/3 and
3253/4
Retainer 3304
Engine/transmission jack V.A.G 1383 A
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pinion and rin
g gear, ad
justin
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11/19/2002 htt
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yp
e=re
pair&id=AUDI.B5.TM03.39.19