BRP Johnson 4HP Service Manual page 149

Checking and adjusting tooth contact pattern
(Pinion and Forward gear)
Check tooth contact pattern by using the following proce-
dure.
1. To assess tooth contact, apply a light coat of Prussian
Blue on the convex surface of the forward gear.
2. Install the propeller shaft, the forward gear thrust washer
and the housing assembly.
Do not install the following parts.
•
Reverse gear and related shim / washer
•
Push rod
•
Push rod pin
NOTE:
Securing the propeller shaft housing with the bolts is not
required.
3. Push the propeller shaft inward and hold in position.
4. Rotate the driveshaft 5 - 6 times clockwise.
5. Carefully pull out propeller shaft and housing to check
tooth contact pattern.
GEARS - SHIMMING AND ADJUSTMENT
Concave side
Convex side
Heel
Tooth top
Tooth bottom
GEARCASE
Tooth width
Toe
TOOTH
CONTACT
PATTERN
8-19