Subaru XT 1988 Service Manual page 743

3-4 4WD SYSTEM
TOOTH CONTACT PATTERN
Condition
Contact pattern Adjustment
Correct tooth contact
Tooth contact pattern slightly
~~
shifted toward toe under no
load rotation.
(When loaded, contact pattern
-
moves toward heel.)
Face contact
Backlash is too large.
4
-+t?
~
~
-
This may cause noise and chip- Increase thickness of drive pinion height
ping at tooth ends.
adjusting washer in order to bring drive pinion
closer to drive gear center.
Flank contact
4(1
Backlash is too small.
+~
y
')
This may cause noise and Reduce thickness of drive pinion height
stepped wear on surfaces.
adjusting washer in order to move drive pinion
away from drive gear.
Toe contact
$
..
~
¥
~
Contact area is small. Adjust as for flank contact.
This may cause chipping at toe
ends.
Heel contact
£f
-+~
:&
0
-
Contact area is small.
Adjust as for face contact.
This may cause chipping at heel
ends.
Fig. 64
A13-164
30