Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 857

27B-40
REAR AXLE -
MB990939
Standard tooth contact pattern
1 Narrow tooth side
2 Drive-side tooth surface (the
side applying power during
forward movement)
3 Wide tooth side
4 Coast-side tooth surface (the
side applying power during
reverse movement)
1
2
3
NOTE
Checking the tooth contact pattern is the way to
confirm that the adjustments of the pinion height
and backlash have been done properly. Continue
to adjust the pinion height and backlash until the
tooth contact pattern resembles the standard
pattern.
Differential Carrier <Vehicles with mechanical LSD>
2. Insert the brass between the differential carrier and the
3. Check the tooth contact condition of the drive gear and
Problem
Tooth contact pattern resulting from
excessive pinion height
2
4
The drive pinion is positioned too far
from the centre of the drive gear.
Tooth contact pattern resulting from
insufficient pinion height
2
The drive pinion is positioned too
close to the centre of the drive gear.
differential case, and then rotate the companion flange
by hand (once in the normal direction, and then once
in the reverse direction) while applying a load to the drive
gear so that the revolution torque (approximate 2.5 -
3.0 N·m) is applied to the drive pinion.
Caution
If the drive gear is rotated too much, the tooth contact
pattern will become unclear and difficult to check.
drive pinion.
Solution
1
4
3
Increase the thickness of the drive
pinion rear shim, and position the
drive pinion closer to the centre of the
drive gear. Also, for backlash adjust-
ment, position the drive gear farther
from the drive pinion.
1
4
3
Decrease the thickness of the drive
pinion rear shim, and position the
drive pinion farther from the centre of
the drive gear. Also, for backlash
adjustment, position the drive gear
closer to the drive pinion.
If, even after adjustments have been made, the
correct tooth contact pattern cannot be obtained,
it means that the drive gear and the drive pinion
have become worn beyond the allowable limit.
Replace the gear set.
2
1
4
3
1
2
4
3