Subaru LEGACY 2006 Manual page 3905

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(6) Measure the hypoid driven gear to drive pin-
ion backlash. Set the magnet base on differen-
tial carrier. Align the contact point of dial gauge
with tooth face of the hypoid driven gear, and
move the hypoid driven gear while holding the
drive pinion still. Read the value indicated on
dial gauge. If the backlash exceeds 0.2 mm
(0.008 in), reduce the thickness of shim on the
back side of the hypoid driven gear and in-
crease the thickness of shims on the teeth side
of the hypoid driven gear. If the backlash is less
than 0.1 mm (0.004 in), increase the thickness
of shim on the back side of the hypoid driven
gear and reduce the thickness of shims on the
teeth side of the hypoid driven gear.
Backlash:
0.10 — 0.20 mm (0.0039 — 0.0079 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 bearing retainer
shims, increasing/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 lb)
17) Recheck the hypoid driven gear to pinion back-
lash.
Backlash:
0.10 — 0.20 mm (0.0039 — 0.0079 in)
Rear Differential (T-type)
18) Check the hypoid driven gear runout on its
back surface, and make sure that the pinion and
hypoid driven gear rotates smoothly.
If the hypoid driven gear runout on its back surface
exceeds the specification, check for any foreign ob-
jects between the hypoid driven gear and differen-
tial case, and for any deformation of the case or
gear.
Hypoid driven gear back surface runout:
0.05 mm (0.0020 in)
19) Checking and adjusting the tooth contact of hy-
poid driven gear
(1) Apply an even coat of red lead on both sides
of three or four teeth on the hypoid driven gear.
Check the contact pattern after rotating the hy-
poid driven gear several revolutions back and
DI-00099
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 red lead completely after the
adjustment is completed.
• Correct tooth contact
Checking item: Tooth contact pattern is slightly
shifted toward toe side under no-load rotation.
(When driving, it moves towards the heel side.)
(A) Toe side
(B) Heel side
DI-00099
DI-39
DIFFERENTIALS
(A)
(B)
DI-00101
AT-00207