Volvo Penta 120S, Workshop Manual

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Repair - MS2 reverse gear and upper gear housing, sailboat drive
83. Measure the cover on the inside ( B ) down to the
shim seat. Then measure the cover on the outside
(
C ).
Example:
S = (C–B)–A, where S is the shim thickness.
First press the bearing race, and turn the gear wheel
about 10 turns. The ensuing measurement A becomes
2.5 mm, for example.
We now measure distance B, which becomes 16.05
mm, for example. We then measure distance C, which
becomes 18.10 mm, for example.
This gives: C–B = 18.10-16.05 = 2.05 mm.
This should be subtracted from the A dimension,
which we measured as 2.5 mm.
2.50 -2.05 = 0.45 mm
NOTE! To obtain the correct pre-load, shims with a
thickness of 0.45 + 0.05 = 0.50 mm should be put in
the cover.
81. Put the slipping clutch into the housing and place
the outer bearing race loose on top of the bearing.
82. Calculate the shim thickness as follows:
Press the outer bearing race with your fingers and turn
the gear wheel (pinion) round about 10 turns, to re-
move any slack in the rollers.
Measure with a depth micrometer 9985474 from the
housing plane, down to the bearing race ( A ).
9985474