Subaru 2009 IMPREZA Service Manual page 2307

Backlash:
0.10 — 0.20 mm (0.004 — 0.008 in)
(7) At the same time, measure the total preload
of the drive pinion. Compared with the resis-
tance when differential case is not installed, if
the total preload is not within specification, ad-
just the thickness of side retainer shims, in-
creasing/reducing both shims by an even
amount at a time.
Total preload:
20.7 — 54.4 N (2.1 — 5.5 kgf, 4.7 — 12.2 lbf)
17) Recheck the hypoid driven gear to drive pinion
backlash.
Backlash:
0.10 — 0.20 mm (0.004 — 0.008 in)
Rear Differential
18) Check the runout on the back side of the hypoid
driven gear, and make sure that the pinion and hy-
poid driven gears rotate smoothly.
If the runout on the back side of the hypoid driven
gear exceeds the specification, check for any for-
eign material between the hypoid driven gear and
differential case, and for any deformation of the
case or gear.
Hypoid driven gear back surface runout:
0.05 mm (0.002 in)
DI-00099
19) Checking and adjusting the tooth contact of hy-
poid driven gear
(1) Apply lead-free red dye evenly on the both
sides of three to four teeth of the hypoid driven
gear. Check the contact pattern after rotating
the hypoid driven gear several revolutions back
and forth until a definite contact pattern appears
on the hypoid driven gear.
(2) When the contact pattern is not correct, re-
adjust.
NOTE:
Be sure to wipe off the lead-free red dye completely
after the adjustment is completed.
• Correct tooth contact
Check item: Tooth contact pattern is slightly
DI-00099
shifted toward toe side under no-load rota-
tion. (When driving, it moves towards the
heel side.)
DI-29
(B)
(A) Toe side
(B) Heel side
DIFFERENTIALS
DI-00101
(A)
MT-01401