1999 AUDI A4 lock

39-48

Checking measurement

Checking dimension "r"

- Install pinion shaft together with measured
shims S3 and S4 and turn 5 rotations in both
directions.

Note:
After removing universal mandrel, and with VW385/30 master gauge or
VW385/15 extension pin in place, check dial indicator again to see if it
indicates 0 with 2 mm preload. If not, correct adjustments. - Install universal mandrel Page 39
-43
, Determining dimension "e";
and perform check measurement.
- Read dial indicator counterclockwise (red scale).

If shims have been determined correctly, deviation "r" (as marked
on outer circumference of ring gear) should be indicated on dial
within a tolerance of 0.04 mm.
Pa
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11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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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
ge 33 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

39-58

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