9-25 LOWER UNIT
5. Carefully pull out propeller shaft and housing to check tooth
contact pattern.
Optimum tooth contact
The optimum tooth contact is shown at right.
A shim adjustment may be necessary to obtain this contact
pattern.
Concave side
Convex side
Heel
Tooth top
Tooth bottom
Tooth width
Toe
TOOTH
CONTACT
PATTERN
Optimum tooth contact
HEEL
Convex side
TOE
approx. 1/3 of
tooth width
approx.
1 mm
Example(1)
Incorrect topside toe contact :
Correction measures :
• Decrease thickness of forward gear shim.
• Slightly increase pinion gear shim thickness.
B
Do not set tooth contact in this position (top side toe
contact). Damage and chipping of forward and pinion
gear may result.
Example(2)
Incorrect bottom side toe contact :
Correction measures :
• Increase thickness of forward gear shim.
• Slightly decrease pinion gear shim thickness.
B
Do not set tooth contact in this position (bottom side
toe contact). Chipping of pinion gear may result.
EXAMPLE OF INCORRECT
Top side toe contact
HEEL
TOE
EXAMPLE OF INCORRECT
Bottom side toe contact
HEEL
TOE
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