Audi Workshop Service and Repair Manuals

Re-determining preload of ball bearings for centre differential This adjustment is necessary when the following components are renewed: t  Gearbox cover t  Spur gear drive input gear t  Spacer sleeve t  Centre differential Special tools and workshop equipment required

t  Press tool -VW 432-

t  Thrust plate -VW 447 H-

t  Straightedge -T 40100- t  Digital depth gauge (e.g. -VAS 6087-) l  Tapered roller bearing outer race for spur gear drive input gear is installed in gearbox cover. l  Spur gear drive input gear, spacer sleeve and centre differential installed.

–  Position straightedge -T40100- onto cleaned joint surface of gearbox cover. –  Using digital depth gauge -1- (e.g. digital depth gauge -VAS 6087-), measure depth between ball bearing -2- and straightedge.   Note To prevent the centre differential from tilting during the measurement, fit the tools VW 447 H and VW 432. In example: measurement -a- = 142.45 mm. –  Add the height of straightedge -T 40100- to this measurement.

Example:
	Depth as measured with digital depth gauge (measurement -a-)	142.45 mm
+	Height of straightedge -T 40100-	39.70 mm
=	Measuring range (overall dimension)	182.15 mm

Select required shim from table → Anchor.

Measuring range (overall dimension)	Shim
Measured value (mm)	Thickness (mm)
181.50 … 181.66	1.65
181.67 … 181.86	1.45
181.87 … 182.06	1.25
182.07 … 182.25	1.05
182.26 … 182.45	0.85
182.46 … 182.65	0.65
182.66 … 182.88	0.45

Note Select correct shims from → Electronic parts catalogue. –  The thickness of the spacer sleeve in this example is 1.05 mm.