Suzuki DF 2.5 Service Manual page 141

Optimum tooth contact
The optimum tooth contact is shown in the figure.
A shim adjustment may be necessary in order to obtain the opti-
mum tooth contact pattern.

The backlash of the gear should be checked when
increasing or decreasing the thickness of the shim to
adjust tooth contact.
Example (1)
Incorrect top side toe contact:
Correction measures:
• Decrease the thickness of the forward gear shim.
• Slightly increase the pinion gear shim thickness.

Do not set tooth contact in the top side toe contact
position. Damage and chipping of the forward and pin-
ion gear may result.
Example (2)
Incorrect bottom side toe contact:
Correction measures:
• Increase the thickness of the forward gear shim.
• Slightly decrease the pinion gear shim thickness.

Do not set tooth contact in the bottom side toe contact
position. Chipping of the pinion gear may result.
LOWER UNIT 8-21
Optimum tooth contact
Approx. 1/3 of
tooth width
HEEL
Convex side
EXAMPLE OF INCORRECT
Top side toe contact
HEEL
EXAMPLE OF INCORRECT
Bottom side toe contact
HEEL
Approx.
1 mm
TOE
TOE
TOE