15. Engine Removal, Inspection & Installation
Tooth Contact
z After adjusting the backlash, check the tooth contact
according to the following procedures:
z Remove drive and driven bevel gear shafts from
crankcase;
z Clean and degrease every tooh of drive and driven
bevel gear;
z Coat the driven bevel gear with machinist’s layout
dye or paste;
z Install drive and driven bevel gear;
z Rotate the driven bevel gear several turns in both
directions;
z Remove drive and driven bevel gear shafts and
check the coated teeth of the drive bevel gear;
z Refer to the illustration on the right for tooth contact
pattern ①, ② and ③
① Incorrect (contact at tooth top)
② Correct
③ Incorrect (contact at tooth bottom)
z If tooth contact is correct (Contact ②), continue the
next procedure.
z If tooth contact is not correct (② and ③), adjust the
thickness of the washer of drive bevel gear. Repeat
above steps to check tooth contact until it is correct.
Adjustment
Tooth Contact Washer Adjustment
Contact at tooth top ① Increase Thickness
Contact at tooth
bottom ③
Decrease Thickness
Note:
z After adjusting the tooth contact, the backlash must
be checked again;
z If the backlash is adjusted but tooth contact is still
out of specification, replace the drive and driven
bevel gears;
z Both tooth contact and backlash should be within
the required specification.
15-45
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