A4 Sedan L4-1.8L Turbo (AEB) (1997)
Notes:
-
To lift differential, secure VW521/4 locking sleeve and VW521/8 bushing (for transmissions without polygon bearing) or VW521112 (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 S total for S1 + S2
2.12 mm
* Pinion shaft removed.
Determining thickness of shim S1*
Notes:
-
S1 is used for the initial measurement. After determining backlash, S1* is replaced with final shim S1.
-
The total shim thickness Stotal remains unchanged.
Formula:
S1* = Stotal - S2*
Example:
Total shim thickness Stotal for S1 + S2
2.12 mm
- Installed shim S2*
1.20 mm
__________
=
Thickness of shim S1*
0.92 mm
* Pinion shaft removed.
Measuring friction torque (check measurement)
Notes:
-
Tapered roller bearings for differential are low-friction. Measurement of friction torque only has a limited use as a check. Correct adjustment is
only possible by determining the tote/ shim thickness "Stotal."
-
Do not lubricate new tapered roller bearings for measuring friction torque. The bearings have already been treated by a special oil by the
manufacturer.
-
Pinion shaft removed