Shimming
SHIMMINGIf the reading obtained is outside the tolerance range, the pinion must be adjusted. Adjustment is carried out by shimming between the bearing housing and the gearcase.
Shim table for manual gearbox
The shimming procedure is as follows:
1. Remove the four bearing housing bolts and gently tap the shaft out of the gearcase.
2. Alter the shim thickness as follows:
- If the dial indicator reading is high, increase the thickness of the shim combination.
- If the reading is low, reduce the thickness of the shim combination.
NOTE: A + reading is anti-clockwise and a reading is clockwise. The amount by which the thickness of the shims is increased or decreased can be determined by calculating the difference between the measured value and the correct value.
If the pinion is stamped - 7, the dial indicator pointers should read - 0.07 mm (0.003 in). The tolerance on this value is +/- 0.05 mm (0.002 in).
1. Shims
2. Roller bearing
3. Bearing housing
4. Pinion
3. After determining the correct combination of shims, place the shims on the gearcase using the locating pins. Use sleeve 83 90 148 and drift 83 90 114. Remove the locating pins and tighten the bolts to the specified torque.
Fit two of the bearing housing bolts and tighten them lightly. Remove the locating pins, fit the other two bolts and tighten all bolts alternately to a torque of 23 - 28 Nm (17 - 21 lb ft).
Checking After Shimming
After shimming, replace the measuring jig in the differential bearing seats and check that the correct reading is obtained on the dial indictor (+/- 0.05 mm or 0.002 in). If not, the shim thicknesses must be re-adjusted.
If the pinion is marked +3, the dial indicator reading should be +0.O3mm (0.0012 in). The tolerance on this reading is +/- 0.05 mm (0.002 in).
To Check The Measuring Jig
The measuring jig is a precision tool. It should be handled with great care to avoid bruising and deformation. If damage to the measuring jig is suspected, so that the wrong readings are obtained during measurement, the jig can be checked. The dimension shown in the figure should then be checked.