Redetermining Shim S4 when Replacing Bearing Housing

Redetermining Shim S4 when Replacing Bearing Housing

Special tools, testers and auxiliary items required

• Universal dial gauge bracket (VW 387)

• Assembly tool (VW 792)

• Digital depth gauge (e.g. (VAS 6087))

• Dial gauge

• Dial gauge extension, 30 mm

• Straightedge

- Clean housing flange.

- Place straightedge (e.g. 19.50 mm wide - 1 - onto housing flange.





- Measure difference between depth - a - on old and new bearing housing with a digital depth gauge (e.g. (VAS 6087)).

Example:





- If new bearing housing is deeper, install a thicker "S 4" shim.

- If previous bearing housing is deeper, install a thinner " S4" shim.

Example:





Shims available Pinion Shaft Adjusting.

- Press tapered roller bearing outer race with shim "S 4" into bearing housing, refer to => [ Pressing tapered roller bearing outer race
into bearing housing ] Pinion Shaft

- Insert completely assembled pinion shaft into transmission housing again.

- Install bearing housing and transmission cover and tighten bolts to 35 Nm.

- Turn pinion shaft 5 turns in each direction so that taper roller bearings seat properly.

- Install assembly device (VW 792) on transmission housing; when doing so, insert an M12 nut - A - between assembly device (VW 792) and transmission housing.





- Attach universal dial gauge bracket (VW 387) with dial gauge and 30 mm extension.

• Attach dial gauge extension exactly at the center of the webbing intersection on the transmission cover - arrow -.

- Set dial gauge (3 mm measuring range) to "0" with 1 mm preload.

- Loosen transmission cover bolts and turn pinion shaft several times.

- If correct shims have been selected the dial gauge will now indicate the following value:

• 0.06 to 0.12 mm

If this reading is not obtained, the adjustment must be corrected.