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Final drive, differential, differential lock > < Determining preload of tapered roller bearings for spur gear

A4 Mk3

Determining thickness of new shim “S6” for adjusting position of centre differential
Determining thickness of new shim “S6” for adjusting position of centre differential
This adjustment is necessary when the following components are renewed:
t  Gearbox cover
t  Spacer sleeve
t  Spur gear
t  Tapered roller bearings on spur gear
Special tools and workshop equipment required
   
t  Straightedge -T 40100-
t  Digital depth gauge (e.g. -VAS 6087-)
l  Tapered roller bearing outer race for spur gear is installed in gearbox cover.
  W00-10297
l  Spur gear and spacer sleeve -1- are installed.
–  Position straightedge -T40100- onto cleaned joint surface of gearbox cover.
–  Using digital depth gauge -2- (e.g. digital depth gauge -VAS 6087-), measure depth between spacer sleeve -1- and straightedge. When taking measurement, press spur gear downwards towards gearbox cover, in direction of -arrow-.
In example: measurement -a- = 5.13 mm.
–  Add the height of straightedge -T 40100- to this measurement.
  A35-10144
Example: 
 Depth as measured with digital depth gauge (measurement -a-)5.13 mm
+Height of straightedge -T 40100-39.70 mm
=Measuring range (overall dimension)44.83 mm

Select required shim from table → Anchor.
   
Measuring range (overall dimension)Shim “S6”
Measured value (mm)Thickness (mm)
44.30…44.401.41
44.40…44.501.31
44.50…44.601.21
44.60…44.701.11
44.70…44.801.01
44.80…44.900.91
44.90…45.000.81
45.00…45.100.71

  Note
Select correct shims from → Electronic parts catalogue.
–  The shim thickness “S6” in this example is 0.91 mm.
   

Final drive, differential, differential lock > < Determining preload of tapered roller bearings for spur gear