Volvo Penta 120S, Workshop Manual

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Repair - MS2 reverse gear and upper gear housing, sailboat drive
92. When the correct flank clearance and marking pat-
tern have been obtained, disassemble the output bear-
ing housing, lower bearing cover and slipping clutch.
Wash off the marking dye. Then disassemble the out-
er bearing race in the cover, using tool no.
884720.
93. Remove the extra 0.5 mm shim thickness which
was installed in item 84.
Then put the calculated shim thickness in the lid and
install the bearing race. Press, using tool no.
884833.
Reverse gear MS2
Preload
94. Install the slipping clutch and tighten the cover.
Turn the housing over and install tools 884735 and
884736. Turn the shaft round with tool no. 884735 in
both directions, to make the bearing “seat” itself.
Wind a string round tool no. 884736 and measure the
pre-load with a spring balance,
9985494.
Preload, new bearings: 15-30 N (3.37-6.74 lbf).
Too much pre-load: Reduce the shim thickness in
the upper cover.
Not enough pre-load: Increase the shim thickness in
the upper cover.
95. When the correct pre-load has been obtained, re-
move the lower bearing cover, the slipping clutch and
the small outer bearing in the gear housing.
Use tool no. 884728 and shaft 9991801 .
NOTE! Save the shims.
884720
884833
99991801
884728
884735
884736
3.37-6.74 lbf
9985494