Suzuki DF25/DF30 Four Stroke Service Manual, Page 249Get this manual
LOWER UNIT 10-25 5Carefully pull out propeller shaft and housing to check tooth contact patternConcave side Convex side Heel Toe Tooth top Tooth bottom TOOTH CONTACT PATTERN
Tooth width
Optimum tooth contact The optimum tooth contact is shown at rightA shim adjustment may be necessary to obtain this contact patternThe backlash of the gear should be checked when increasing or decreasing the thickness of the shim to adjust tooth contactExample(1) Incorrect topside toe contact: Correction measures: Decrease thickness of forward gear shim Slightly increase pinion gear shim thicknessDo not set tooth contact in this position (top side toe contact)Damage and chipping of forward and pinion gear may resultExample(2) Incorrect bottom side toe contact: Correction measures: Increase thickness of forward gear shim Slightly decrease pinion gear shim thickness