AUDI A6 1999 C5 / 2.G 01E Transmission Final Drive Pinion And Ring Gear Workshop Manual

39-33


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.
The frictional torque measurement is only used
as a final check to make sure that the
adjustment is correct.
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Gear sets, adjusting and marking

1 -
Identification "0937" signifies Oerlikon
gear set with a ratio of 37:9.
2 -
Pairing number (312) of final drive set.
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 on test
machine Ro = 59.65 mm
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R - Actual distance between ring gear axis
and face of drive pinion at point with
quietest running for this gear set R = Ro
+ r
Vo - Hypoid offset
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39-36

Final drive set readjusting,
recommended sequence

The following sequence of work 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" (sets preload for tapered roller
bearings for differential) from Page 39
-
54
.
2.) Determine total shim thickness "S
total
" for
"S3" + "S4" (sets preload for tapered roller
bearings for drive pinion) from Page 39
-
41
.
3.) Distribute total shim thickness "S
total
" for "S3"
+ "S4" so that the distance from center of ring
gear to face of drive pinion is the same as
distance "R" which was determined during
production from Page 39
-47
.
4.) Distribute total shim thickness "S
total
" for "S1"
+ "S2" so that the specified backlash
between ring gear and drive pinion is
maintained from Page 39
-61
.

Note:
Overview of components and shims Page 39
-
38
.
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39-37
Adjustment overview

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

adjustment required:

Parts replaced:

Ring gear
"S1"+"S2"
1)

Page 39
-52

Drive pinion
"S3"+"S4"
1)
via deviation "r"
Page 39
-39

Drive pinion
"S4"
1)

Page 34-121

Backlash
Check

Page Page 39
-59

Transmission housing X X X
Bearing plate 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
Hollow shaft X X
Cover for differential X X
1) Shims; installation position Page 39
-38
.
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2) Drive pinion and ring gear; only replace together.
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39-38


Shims, position

Note:
Adjustment overview when replacing individual
components of transmission Page 39
-37
.
S1 - Adjustment shim for ring gear in cover
for differential
S2 - Adjustment shim for ring gear in
transmission housing
S3 - Adjustment shim for drive pinion in
transmission housing
S4 - Adjustment shim for drive pinion in
bearing plate
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