Shim "S4," RE-Determining
Shim "S4," re-determining
Special tools, testers and auxiliary items required:
^ End measuring plate VW 385/32
^ Clamping sleeve 3116
^ Hex bolt 3116/1
^ Depth gauge, accurate to 5/100 mm
^ Caliper gauge, accurate to 5/100 mm
^ Torque wrench
This adjustment is necessary when replacing following components:
^ Bearing plate
^ Hollow shaft
This adjustment re-creates the preload of the tapered rollers for the drive pinion and hollow shaft.
1. Shim "S4"
2. Bearing plate
3. Transmission - housing
4. Hollow shaft
5. Drive - pinion/hollow shaft tapered roller bearing
6. Drive pinion
a. Bearing plate housing depth
b. Dimension from drive pinion head to contact shoulder of tapered roller bearing on hollow shaft
^ Tapered roller bearings (drive pinion/hollow shaft) preloaded to 10 Nm
S4 -Thickness of shim "S4"
Note: When replacing the drive pinion (final drive set), observe adjustment overview, Refer to Differential Assembly, Adjustments
Determining shim when replacing bearing plate
Use a depth gauge which is accurate to within at least 0.05 mm.
- Measure difference of depth "a" on old and new bearing plates
Example:
- If new bearing plate is deeper, install a thicker"S4" shim.
- If old bearing plate is deeper, install a thinner"S4" shim.
Example:
Available shims, table
Determining shim when replacing hollow shaft
Use a caliper gauge which is accurate to within at least 0.05 mm.
- Tighten tensioning sleeve to exactly 10 Nm.
A - Vice clamps
- Fit end measuring plate VW 385/32 onto drive pinion head and measure dimension "d".
^ Upper measuring point is the contact shoulder for inner race of small tapered roller bearing
Example: 248.50 mm
- Install new hollow shaft and measure dimension "d" again.
Example: 248.70 mm
- Determine difference:
- Install a correspondingly thinner shim "S4" if dimension "d" of new hollow shaft is greater.
- Install a correspondingly thicker shim "S4" if dimension "d" of new hollow shaft is less.
- Determine shim(s) from table:
Refer to Parts Supplier
Available shims for "S4"
1) Using the shim tolerance variations it is possible to find the exact shim thickness required, insert two shims if necessary.