Subaru XT 1988 Service Manual page 650

AUTOMATIC TRANSMISSION AND DIFFERENTIAL
3-2
contact pattern.
(8) Apply red lead evenly to the surfaces of three or
four teeth of the crown gear. Rotate the drive pinion in
the forward and reverse directions several times. Then
remove the oil pump housing, and check the tooth
If tooth contact is improper, readjust the backlash or
shim thickness.
Checking item
Correct tooth contact
Tooth contact pattern slightly
sh ifted toward toe under no-load
rotation.
(When loaded, contact pattern
moves toward heel.)
Face contact
Backlash is too large.
Flank contact
Backlash is too small.
Toe contact
(Inside end contact)
Heel contact
(Outside end contact)
Fig. 230
Contact pattern
This may cause noise and chipping at
tooth ends.
This may cause noise and stepped wear
on surfaces.
Contact area is small. This may cause
chipping at toe ends.
Contact area is small.
This may cause chipping at heel ends.
123
Corrective action
Increase thickness of drive pinion hight
adjusting shim in order to bring drive
pinion close to crown gear.
Reduce thickness of drive pinion hight
adjusting shim in order to move drive
pinion away from crown gear.
Adjust as for flank contact.
Adjust as for face contact.
A13·164