1999 AUDI A4 transmission

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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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

39-63


Checking measurement
Note:
For transmissions without polygon bearing, use VW521/8 bushing instead
of VW521/12 shown.
Notes: - After installing shims "S1" and "S2," turn differential 5 rotations in each
direction to seat tapered roller bearings.
- Measure backlash 4 times on circumference.
Specification: 0.12-0.22 mm
If backlash lies outside tolerance, repeat adjustments. Do not change
total shim thickness "Stotal." The individual measurements must not vary more than 0.06 mm from
each other.
Pa
ge 43 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