Subaru Impreza 2002 Service Manual page 408

E: INSPECTION
Repair or replace the front differential in following
cases:
• Each gear is damaged, seized, or excessively
worn.
• Sliding surfaces of the differential case is dam-
aged, seized or excessively worn.
• Bearings and bearings part is damaged, rusted
or worn.
• Bearings that fail to turn smoothly or make ab-
normal noise when turned.
1. BEVEL PINION GEAR BACKLASH
Measure the bevel pinion gear backlash. If it is not
within specifications, install a suitable washer to
adjust it. <Ref. to 6MT-114, ADJUSTMENT, Front
Differential Assembly.>
NOTE:
• Be sure the pinion gear teeth contacts adjacent
gear teeth during measurement.
• Before measuring the backlash, rotate each gear
to get each part accustomed.
ST1 498247001 MAGNET BASE
ST2 498247100 DIAL GAUGE
Standard backlash:
0.13 — 0.18 mm (0.0051 — 0.0071 in)
2. HYPOID GEAR BACKLASH
Check the hypoid gear backlash. If it is not within
specifications, adjust it. <Ref. to 6MT-114, HY-
POID GEAR BACKLASH, Front Differential As-
sembly.>
3. TOOTH CONTACT OF HYPOID GEAR
1) Be sure the hypoid gear backlash is within spec-
ifications. If it is not within specifications, adjust it.
<Ref. to 6MT-114, HYPOID GEAR BACKLASH,
Front Differential Assembly.>
FRONT DIFFERENTIAL ASSEMBLY
G3M0670
6MT-113
MANUAL TRANSMISSION AND DIFFERENTIAL
2) Apply a uniform thin coat of red lead on both
tooth surfaces of three or four teeth of the hypoid
driven gear.
3) Install the drive pinion shaft assembly, and then
secure with four bolts.
NOTE:
Use the old gasket and washer to prevent the mat-
ing surface of housing from damaging.
Tightening torque:
69 N·m (7.0 kgf-m, 50.9 ft-lb)
4) Rotate the drive pinion shaft to right and left for
several times.
5) Remove the drive pinion shaft assembly, and
then check tooth contact. If tooth contact is inaccu-
rate, adjust it. <Ref. to 6MT-105, ADJUSTMENT,
Drive Pinion Shaft Assembly.>
• Correct tooth contact.
NOTE:
Under no load, tooth contacts 50—60% from center
to toe side (tooth contact shifts to heel side when
driving).
(B)
(A) Toe side
(B) Heel side
TR0816
(A)
TR0827