Audi Workshop Service and Repair Manuals

Determining preload of tapered roller bearings for spur gear drive input gear Determining thickness of shim “S5” This adjustment is necessary when the following components are renewed: t  Gearbox cover t  Centre differential housing t  Bearing plate t  Spur gear drive input gear t  Tapered roller bearing on spur gear drive input gear Special tools and workshop equipment required

t  Measuring plate -VW 385/17- from universal measuring tool -VW 385-

t  Universal dial gauge bracket -VW 387-

t  Crown wheel adjusting tool -VW 521-

t  Dial gauge extension from dial gauge adapter -2066- l  Tapered roller bearing outer race for spur gear drive input gear is installed in gearbox cover. l  Tapered roller bearing outer race for spur gear drive input gear (without shim) is installed in bearing plate. –  Insert spur gear drive input gear in gearbox cover.

Install bearing plate on gearbox cover as follows: l  Installation position: lug -arrow A- on bearing plate -1- must engage in recess -arrow B- in gearbox cover.

–  Then secure centre differential housing -B- to gearbox cover with bolts -A- and -arrows- (5x). –  Then rotate gearbox cover with housing for centre differential attached so it is vertical, with housing for centre differential facing downwards.

–  Attach measuring equipment. –  Secure universal dial gauge bracket -VW 387- to threaded hole in gearbox cover with bolt -B- and nut. –  Apply dial gauge extension to centre of measuring plate -VW 385/37-. –  Set dial gauge (3 mm measuring range) to “0” with 2 mm preload. -A-Dial gauge extension from dial gauge adapter -2066- –  Move spur gear drive input gear up and down using crown wheel adjusting tool -VW 521-. –  Read off play from dial gauge (in this example: 0.76 mm). Example:

Measurement result (example)	0.76 mm
Preload (constant value)	+ 0.10 mm
Thickness of shim S5	= 0.86 mm

Note Select correct shims from → Electronic parts catalogue. –  The shim thickness “S5” in this example is 0.86 mm.