BRP Johnson 4HP Service Manual page 147

GEARS - SHIMMING AND ADJUSTMENT
If the gearcase has been rebuilt or has had components replaced, shimming for correct gear contact and
backlash will have to be adjusted in order to ensure smooth, reliable operation of gears.
Shim / Washer and Mounting position
Numerical index / item
1
Pinion gear backup shim
2
Forward gear backup shim
3
Forward gear thrust washer
4
Reverse gear thrust washer
5
Reverse gear backup shim
GEARS - SHIMMING AND ADJUSTMENT
Available thickness (mm)
1.7; 1.8; 1.9; 2.0; 2.1
0.8; 0.9; 1.0; 1.1; 1.2
1.0
0.6; 0.8; 1.0
0.6; 0.7; 0.8; 0.9; 1.0
GEARCASE
Design specification thickness (mm)
2.0
1.2
1.0
1.0
0.8
1 Pinion gear backup shim
2 Forward gear backup shim
3 Forward gear thrust washer
4 Reverse gear thrust washer
5 Reverse gear backup shim
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