215
GEARCASE
SHIMMING ADJUSTMENTS
9
If thrust play is too large, thickness of forward gear
back up shim must be increased.
If thrust play is too small, back up shim thickness
must be decreased.
Gear Tooth Contact Pattern
Apply a light coat of Prussian Blue on the convex
surface of forward gear.
Install propeller shaft and housing assembly
(minus reverse gear and internal components).
Push propeller shaft inward and hold in position.
Rotate the driveshaft clockwise 5-6 times by hand.
Pull out propeller shaft and housing to check tooth
contact pattern.
If pattern is too high:
• Decrease forward gear shim thickness.
• Slightly increase pinion gear shim thickness.
If pattern is too low:
• Increase forward gear shim thickness.
• Slightly decrease pinion gear shim thickness.
IMPORTANT: Damage and chipping of forward
and pinion gear may result if tooth pattern is not
correct.
IMPORTANT: Recheck driveshaft thrust play if
shimming has been adjusted.
Pinion Gear/Reverse Gear
Recheck driveshaft thrust play against forward
gear. Note the measurement (A).
Apply outward pressure on the propeller shaft.
Check the amount of driveshaft thrust play against
the reverse gear. Not the measurement (B).
Measurement (B) should be equal to measure-
ment (A).
If (B) is less than (A), reduce reverse gear back-
up shim thickness.
005935
004410
Optimum Tooth Contact 004411
Approx. 1/3 of
tooth width
Approx.
1 mm
Convex side
TOE
HEEL
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