Audi Workshop Service and Repair Manuals

Adjusting differential It is necessary to readjust the differential when the following components have been renewed: t  Gearbox housing t  Clutch housing t  Differential cage t  Differential tapered roller bearings Table of adjustments → Chapter.

Special tools and workshop equipment required

t	Gearbox support -VW 353-

t	End measuring plate -VW 385/17-

t	Universal dial gauge bracket -VW 387-

t	Thrust plate -VW 402-

t	Press tool -VW 408 A-

t	Thrust plate -3005-

t	Tube -3259-

t	Tube for wheel bearing -3345-

t	Torque wrench -V.A.G 1331-

t	-1-Internal puller -Kukko 21/7-

t	-4-Counter-support -Kukko 22/2-

Procedure –  Press tapered roller bearing outer race with shim (thickness: 0.65 mm) into clutch housing.   Note The tapered roller bearing inner and outer races are paired. Do not interchange.

–  Press tapered roller bearing outer race (without shim) into gearbox housing. –  Install differential in clutch housing. –  Fit gearbox housing and tighten 5 bolts to specified torque. –  Press differential towards clutch housing; hold in this position and turn eight times. –  Press differential towards gearbox housing; hold in this position and turn eight times.

–  Attach dial gauge and set to “0” with a preload of 1 mm. A -  Dial gauge extension, 30 mm –  Move differential up and down and note play indicated on dial gauge (in this example: 0.70 mm). Determining thickness of shim The specified bearing preload is obtained by adding a constant figure (0.30 mm) to the reading indicated. Example:

Measured value	0.70 mm
+ Preload (constant value)	0.30 mm
Thickness of shim =	1.00 mm

–  Select required shim thickness from following table.

Shim thickness (mm) → Note
0.65	1.00	1.35
0.70	1.05	1.40
0.75	1.10	0.70 + 0.75 = 1.45
0.80	1.15	0.75 + 0.75 = 1.50
0.85	1.20	0.75 + 0.80 = 1.55
0.90	1.25	0.80 + 0.80 = 1.60
0.95	1.30	0.80 + 0.85 = 1.65

1)  Part No.; for allocation refer to → Parts catalogue –  Take off gearbox housing.

–  Pull tapered roller bearing outer race out of gearbox housing. A -  Counter-support -Kukko 22/2- B -  Internal puller 46 ... 58 mm -Kukko 21/7- –  Install shim(s) of the required thickness (thicker shim first).

–  Press outer race in again and tighten gearbox housing bolts to specified torque.