214
GEARCASE
SHIMMING ADJUSTMENTS
SHIMMING
ADJUSTMENTS
If gearcase has been rebuilt or has had compo-
nents replaced, shimming for correct gear contact
and backlash will have to be adjusted to ensure
smooth, reliable operation of gears.
Shim/Washer Positions
Forward Gear/Pinion Gear
Correctly assemble forward gear, pinion gear,
driveshaft, and related components. Refer to
ASSEMBLY on p. 209.
Check that a slight amount of backlash exists
between pinion gear and forward gear by slightly
rotating driveshaft or forward gear by hand.
• If there is no backlash, reduce back-up shim
thickness.
• If there is too much backlash, increase back-up
shim thickness.
Driveshaft Thrust Play
Connect a dial indicator to driveshaft as shown.
To check driveshaft thrust play, push forward gear
inward. Slowly push driveshaft completely down-
ward. Hold shaft in and set dial gauge pointer to
zero. Slowly pull upward to read the maximum
thrust play:
• 0.016 to 0.023 in. (0.4 to 0.6 mm)
Item
Available
thickness
(mm)
Design
specification
thickness (mm)
1 Pinion gear
back up shim
1.7, 1.8, 1.9,
2.0, 2.1, 2.2
2.0
2 Forward gear
back up shim
0.8, 0.9, 1.0,
1.1, 1.2, 1.3,
1.4, 1.5
1.2
3 Forward gear
thrust washer
2.0
2.0
4 Reverse gear
thrust washer
1.6, 1.8, 2.0,
2.2, 2.4, 2.6
2.0
5 Reverse gear
back up shim
0.2, 0.5, 0.8, 1.0
1.5
005933
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005934
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