BOMBARDIER Johnson 90 Service Manual page 341

LOWER UNIT
ASSEMBLY ANO INSTALLATION -140 (NORMAL ROTATION)
Optimum Tooth Contact
Optimum tooth contact is shown at right.
A shim adjustment may be necessary to obtain this contact
pattern.
IACAUTION
1
Forward gear backlash must be checked if either or both
driveshaft or forward gear shims are changed
Example (1)
lncorrect topside toe contact:
Correction measures:
• Decrease thickness of forward gear shim.
• Slightly increase pinion gear shim thickness.
IACAUTION
1
Do not set tooth contact in this position (top side toe
contact). Damage and chipping of forward and pinion
gear may result.
Example (2)
lncorrect bottom side toe contact:
Correction measures:
• lncrease thickness of forward gear shim.
• Slightly decrease pinion gear shim thickness.
IACAUTION
1
Do not set tooth contact in this position (bottom side toe
contact). Chipping of pinion gear may result.
Concave sida
Convex sida
Heel
Optlmum tooth contact
approx. 1/3ot
tooth wldlh
approx.
1mm
Convex sida
EXAMPLE OF INCORRECT
Top slde toe contact
HEEL
EXAMPLE OF INCORRECT
Bottom alde toe contact
HEEL
9-53