Subaru Impreza 2002 Service Manual page 401

MANUAL TRANSMISSION AND DIFFERENTIAL
5) Remove the drive pinion shaft assembly, and then check tooth contact. If it is inaccurate, adjust the back-
lash or thickness of shim.
Checking item
Tooth contact
Tooth contact pattern is slightly shifted
toward to 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)
Contact areas is small.
Heel contact (outside end contact)
Contact area is small.
: Adjusting direction of drive pinion
: Adjusting direction of crown gear
DRIVE PINION SHAFT ASSEMBLY
Contact pattern
This may cause noise and chipping at
tooth ends.
This may cause noise and stepped wear
on surfaces.
This may cause chipping at toe.
This may cause chipping at heel ends.
6MT-106
Corrective action
B3M0317A
Increase thickness of drive pinion height
adjusting shim in order to bring drive pin-
ion close to crown gear.
B3M0319
Reduce thickness of drive pinion height
adjusting shim in order to move drive pin-
ion away from crown gear.
B3M0320
Adjust as for flank contact.
B3M0321
Adjust as for face contact.
B3M0322
—
B3M0323
B3M0324
B3M0324
B3M0323