Crown Wheel, Adjusting

Crown Wheel, Adjusting

Special tools, testers and auxiliary items required

• Drift (VW 295)

• Dial Gauge Extension (VW 382/10)

• Magnetic Plate (VW 385/17)

• Dial Gauge Holder (VW 387)

• Measuring Lever, Adjustable (VW 388)

• Pressure Plate (VW 402)

• Punch (VW 408 A)

• Crown Wheel Adjustment Device (VW 521)

• Sleeve (30 - 14)

• Thrust Piece (2050)

• Thrust Piece (3005)

• Torque Wrench (V.A.G 1331)

• Dial gauge

• Dial gauge extension 30 mm

A new ring gear adjustment is required when the following components have been replaced:

Transmission housing, final drive cover, differential tapered roller bearings, differential housing or the gear set

Adjustment overview. Refer to => [ Adjustment Overview ] Adjustment Overview

Determine total shim thickness "Stotal" for adjustment shims "S1" + "S2"

(Setting preload of tapered roller bearing for differential)

• Drive pinion removed

- Remove flange shaft sealing rings.

- Remove outer races/tapered roller bearings for differential and remove adjustment shims. Refer to => [ Differential ] Differential.

- Drive outer race for right tapered roller bearing together with shim "S2" into differential housing. Use a shim " S2*" with a 1.30 mm thickness for measurement purposes (2 shims with 0.65 mm).





• For the initial measurement, an adjustment shim "S2" with a thickness of 1.30 mm is inserted. It is designated as "S2* " in the following. After determining backlash, "S2* " is replaced by final "S2".

- Pressing outer race for tapered roller bearing without shim " S1" into final drive cover.





- Insert differential into transmission housing. Ring gear is located on left side in front of final drive cover.

- Install final drive cover with 4 bolts (20 Nm).

- Turn transmission so that final drive cover faces upward.

- Turn differential 5 turns in both directions so that the tapered roller bearings settle.

- Place Magnetic Plate (VW 385/17) on differential.

- Assemble measuring tool, use 30 mm dial gauge extension.





- Set gauge (3 mm measuring range) - A - to " 0" with 2 mm pre-load.

• Tip of dial indicator must be positioned on the center of the differential.

- Lift the differential without turning it, read backlash on dial indicator and note.

• Measured value in following example: 0.62 mm

• To raise differential, secure special tools (VW 521/4 ) and (VW 521/12) at right on differential (housing side).





• If measurement is repeated, differential must first be rotated 5 complete revolutions in both directions again to seat tapered roller bearing.

Formula: "Stotal" = "S2* " + measured value + bearing preload





Determining thickness of adjustment shim "S 1*"

• Initial shim "S1*" is replaced with final shim "S1" after backlash has been determined.

• The total shim thickness "Stotal" remains unchanged.

Formula: "S1*" = "Stotal" - " S2*"





Measure and adjust the backlash. Refer to => [ Backlash, Measuring and Adjusting ] Backlash, Measuring and Adjusting.