136
GEARCASE
GEAR SHIMMING AND ADJUSTMENT
Forward Gear/Pinion Gear
Backlash Adjustment
To check the gear backlash of the pinion and for-
ward gear, hold the pinion gear by hand, then
gently rock forward gear back and forth by hand.
Gear backlash:
•
0.004 to 0.008 in. (0.10 to 0.20 mm)
If backlash is larger than specified, the thickness
of the forward gear backup shim must be
increased.
If backlash is smaller, the thickness of the backup
shim must be decreased.
Tooth Contact Pattern
To check and adjust the tooth contact pattern of
the pinion and forward gear, apply a light coat of
Prussian Blue on the convex surface of the for-
ward gear.
Install the propeller shaft and the housing assem-
bly. Do not install the push rod.
IMPORTANT:
Securing the propeller shaft
housing with the bolts is not required.
Push the propeller shaft inward and hold in posi-
tion.
Rotate the driveshaft clockwise five to six times.
Carefully pull out propeller shaft and housing to
check tooth contact pattern.
006270
006273
006271
006272
006274
Concave side
Convex side
Heel
Tooth top
Tooth bottom
Toe
TOOTH
CONTACT
PATTERN
Tooth width
