Volvo Penta 120S, Workshop Manual

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Repair - MS2 reverse gear and upper gear housing, sailboat drive
100. Measure the gear flank clearance on both gear
wheels, using a dial gauge 9999683. Press the gear
wheel downwards.
The clearance should be
0.10-0.25 mm (0.004-0.010")
If the flank clearance is not enough, further shims
should be added to the input bearing housing.
If the flank clearance is too great, reduce the thick-
ness of the shims.
NOTE! It may be necessary to reduce the shim thick-
ness below the gear wheel.
101. Turn the gear housing upside down. Press the
other gear wheel down and do the same operations as
in the previous item.
102. Apply marking dye to the gear wheel. Turn the in-
put shaft round in the direction of engine rotation. Pro-
tect the splines on the input shaft with a rubber sheet
etc.
Brake with tool no. 884738.
103. Check whether the marking pattern corresponds
with marking pattern A , which is correct. The pattern
should be located at the centre of the tooth, in height,
but displaced towards the small end.
NOTE! Consideration can not be given to the marking
pattern on the input pinion, since this is influenced by
both gear wheels.
884738
9999683
9999683