ENGINE 3-59
TOOTH CONTACT
After backlash adjustment is carried out, the tooth contact must
be checked. Pay attention to the following procedures:
• Remove the driven bevel gear.
• Clean and degrease several teeth of the drive and driven
bevel gears.
• Apply a coating of machinist’s layout dye or paste to several
teeth of the driven bevel gear.
• Install the driven bevel gear.
• Rotate the driven bevel gear several turns in both directions.
• Remove the driven bevel gear and inspect the coated teeth of
the drive bevel gear. The tooth contact pattern should be as
shown in 1, 2 and 3.
• If tooth contact is found to be correct (example 2), go to the
ENGINE REASSEMBLY section on p.3-61 to complete instal-
lation.
1 Incorrect (contact at tooth top)
2 Correct
3 Incorrect (contact at tooth root)
• If tooth contact is found to be incorrect (examples 1 and 3),
the shim thickness between the drive bevel gear and driven
bevel gear must be changed and the tooth contact rechecked
until correct.

Make sure to check the backlash after the tooth con-
tact 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 drive and driven bevel gears.
Tooth contact
Drive bevel gear shim adjustment
Driven bevel gear shim adjustment
Contact at tooth top 1 Increase shim thickness Increase shim thickness
Contact at tooth root 3 Decrease shim thickness Decrease shim thickness

!
Part No.
Shim thickness
For drive bevel gear (3-60)
24935-19B00-025: 0.25 mm (0.0098 in)
24935-19B00-030: 0.30 mm (0.0118 in)
24935-19B00-035: 0.35 mm (0.0138 in)
24935-19B00-115
0.30+0.30=0.60 mm (0.0236 in)
0.30+0.35=0.65 mm (0.0256 in)
0.35+0.35=0.70 mm (0.0276 in)
0.25+0.25+0.25=0.75 mm (0.0295 in)
0.25+0.25+0.30=0.80 mm (0.0315 in)
0.25+0.25+0.35=0.85 mm (0.0335 in)
0.90 mm (0.0354 in)
0.95 mm (0.0374 in)
1.00 mm (0.0394 in)
1.05 mm (0.0413 in)
1.10 mm (0.0433 in)
1.15 mm (0.0453 in)
24935-19B00-110
24935-19B00-105
24935-19B00-100
24935-19B00-095
24935-19B00-090
Combined shim
0.25+0.25=0.50 mm (0.0197 in)
0.25+0.30=0.55 mm (0.0217 in)
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