Volvo Penta 120S, Workshop Manual

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Repair - MS2 reverse gear and upper gear housing, sailboat drive
Reverse gear MS2
Marking pattern
88. Remove the output bearing housing and apply a
thin layer of marking dye to the lower gear and the
gear wheel on the output shaft.
Install the bearing housing again and turn tool no.
884735 round in both directions, at the same time as
the propeller shaft flange is braked.
89. Remove the output bearing housing and check
whether the marking pattern on the gear wheel corre-
sponds 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.
90. If the marking pattern is similar to B , the output
shaft must be moved inwards by removing shims from
the bearing housing.
If the flank clearance is too small after this operation,
the lower drive must be moved downwards by reduc-
ing the shim thickness underneath the bearing race in
the cover.
NOTE! To retain the preload in the lower gear wheel
bearing, the shim thickness for the upper bearing out-
er race must be increased to the same extent.
91. If the marking pattern is similar to C , move the
output shaft and lower gear wheel in the opposite di-
rections to what was specified in item 74.
884735