Shimming

NOTE: The following work must be carried out before assembly is started.

If the reading obtained is outside the tolerance range, the output shaft must be re-adjusted.

Location Shims
Thickness, mm (in) Part No.
______________________________________________________________

0utputshaft 0,10 (0.004) 83 41 752
between bearing 0,15 (0.006) 83 41 760
housing and 0,30 (0.012) 83 41 778
gearcase. 0,50 (0.020) 83 44 723
______________________________________________________________





PINION ADJUSTMENT ON MANUAL GEARBOX
1. Shims
2. Roller bearing
3. Bearing housing
4. Pinion

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 should be increased or decreased is 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).

3. After determining the correct combination of shims, place the shims in the gearcase using the guide pins. Use sleeve 83 90 148 and drift 83 90 114 to fit the output shaft to the gearcase.





Fit two of the bolts and tighten them lightly. Remove the guide pins, fit the other two bolts and tighten all bolts alternately to the specified torque. Use Loctite 242 locking compound.

Tightening torque: 23-28 Nm(17-21 lb ft)

CHECKING AFTER SHIMMING
After shimming, replace the measuring jig in the differential bearing seat and check that the correct reading is obtained on the dial indicator (0.05 mm or 0.002 in). If not the shim thicknesses must be re-adjusted.





If the pinion is marked +3, the pointer reading should be +0.03 mm (0.001 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.