3D-18 Propeller Shafts:
Tooth Contact
CAUTION
!
Make sure to check the backlash after the
tooth contact has been adjusted, since it may
have changed. Adjust the tooth contact and
backlash until they are both within
specification. If the correct tooth contact
cannot be maintained when adjusting the
backlash, replace the rear output shaft drive
and driven bevel gears.
1) Remove the special tool and rear output shaft from
the left crankcase.
2) Clean and degrease several teeth of the drive and
driven bevel gears, and then apply a coating of
machinist’s layout dye or paste to several teeth of
the driven bevel gear.
3) Install the rear output shaft.
4) Rotate the rear output shaft several turns in both
directions.
5) Remove the rear output shaft and inspect the coated
teeth of the drive bevel gear. The tooth contact
pattern should be correct as shown in example (2).
If tooth contact is found to be incorrect (examples (1)
and (3)), the shim thickness between the drive bevel
gear and bearing must be changed and the tooth
contact re-checked until correct (examples (2)).
Tooth contact Shim adjustment
Contact at tooth top (1) Increase shim thickness
Contact at tooth root (3) Decrease shim thickness
Incorrect (Contact at tooth top)
Incorrect (Contact at tooth root)
Correct
[A]
[B]
[C]
I831G1340095-02
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