1999 AUDI A4 ECU

39-37

Determining total shim thickness Stotal for
shims S3 + S4

- Adjust preload of tapered roller bearing for
pinion shaft.

Differential removed

- Pressing on double tapered roller bearing inner
race Page 35
-21
.

Note:
The illustration shows the pinion shaft without gears. - Secure lower tapered roller bearing (arrow).

Pressure plates with a thickness of 14.8 mm or 15.3 mm can be installed. - Install tapered roller bearing outer race for pinion shaft without shims
into transmission housing Fig. 3, Page 35
-30
.
- Install rubber washer (item 40 , Page Page 35
-28
) and pressure
plate (item - 39 -, Page Page 35
-28
) into transmission cover.
Pa
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39-42

Checking preload for tapered roller bearing
for pinion shaft

- Turn pinion shaft 5 rotations in each direction to
seat tapered roller bearing.

Notes:

If the pinion shaft cannot be turned by hand,
install a M10 x 20 bolt into face of pinion shaft
and turn the pinion shaft at this bolt using tool.
Remove bolt after turning pinion shaft.

- Install measuring tools and secure to transmission housing with bolt
(arrow).
- Attach dial indicator (3mm measuring range) to center of transmission
cover and set to 0 with 2 mm preload.
- Loosen transmission cover bolts and turn pinion shaft.
If correct shims have been selected, dial indicator will now indicate the
following value: 0.05-0.15 mm.
- Tighten transmission cover bolts to 22 Nm (16 ft lb).
- Remove measuring tools.
- Turn pinion shaft 5 rotations in each direction to seat tapered roller
bearing.
Pa
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pair&id=AUDI.B5.TM01.39.5

39-51

Preload for tapered roller bearing for pinion
shaft, checking

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

Note:
The pinion shaft can be turned by simultaneously
turning both drive flanges.

- Install measuring tools and secure to transmission housing with bolt
(arrow).
- Attach dial indicator (3 mm measuring range) to center of transmission
cover and set to 0 with 2 mm preload.
- Loosen transmission cover bolts and turn pinion shaft.
If correct shims have been selected, the dial indicator will now indicate
the following value: 0.05-0.15 mm.
- Remove measuring tools.
- Coat sealing surfaces with thin layer of sealant AMV 188 001 02.
- Tighten transmission cover bolts to 22 Nm (16 ft lb).
Pa
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g gear, ad
justin
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11/19/2002 htt
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yp
e=re
pair&id=AUDI.B5.TM01.39.5

39-55

- Lift differential without turning it, read play on
dial indicator and note.
Dimension in the following example: 0.62 mm

Notes:

To lift differential, secure VW521/4 locking sleeve and VW521/8
bushing (for transmissions without polygon bearing) or VW521/12 (for
transmissions with polygon bearing) to right side of differential
(housing side). If measurement has to be repeated, turn differential again 5 rotations
in both directions to seat tapered roller bearing.
Formula:
"Stotal"
=
"S2*" + measured value + bearing preload
Example:

Installed shim "S2*" 1.20 mm
+ Dimension 0.62 mm
+ Bearing preload (constant) 0.30 mm
=
Total shim thickness "Stotal" for "S1 + S2"
2.12 mm
Pa
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g gear, ad
justin
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11/19/2002 htt
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yp
e=re
pair&id=AUDI.B5.TM01.39.5

39-58

Measuring backlash
(Position of ring gear in transmission housing)

Pinion shaft with shims "S3*" and "S4*"
installed

- Install differential.

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

- Secure VW387 dial gauge holder on housing.
- Install VW521/4 locking sleeve and VW521/8 bushing (for
transmissions without polygon bearing) or VW521/12 (for transmissions
with polygon bearings).
- Install dial indicator with VW382/10 extension pin, 6 mm.
- Set VW388 measuring lever to dimension "a:"Dimension "a"
Ring gear diameter
67 mm 170 mm
72 mm 180 mm
Pa
ge 37 of 43 Pinion shaft and rin
g gear, ad
justin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.TM01.39.5