Subaru 2002 IMPREZA Service Manual page 2015

Symptom or trouble
6. Gear noises
NOTE:
Since noises from engine, muffler, trans-
mission, propeller shaft, wheel bearings,
tires, and body are sometimes mistaken
for noises from differential assembly, be
careful in checking them. Inspection
methods to locate noises include coast-
ing, accelerating, cruising, and jacking-up
all four wheels. Perform these inspections
according to condition of trouble. When
listening to noises, shift gears into four
wheel drive and fourth speed position, try-
ing to pick up only differential noise.
GENERAL DIAGNOSTIC TABLE
Possible cause
(1) Improper tooth contact of hypoid gear. Readjust or replace the hypoid gear set.
(2) Improper backlash for hypoid gear.
(3) Scored or chipped teeth of hypoid
gear.
(4) Seized hypoid gear.
(5) Improper preload for front or rear
bearings.
(6) Seized, scored, or chipped front or
rear bearing.
(7) Seized, scored, or chipped side bear-
ing.
(8) Vibrating differential carrier.
DI-65
DIFFERENTIALS
Remedy
Readjust.
Replace the hypoid gear set.
Replace the hypoid gear set.
Readjust.
Replace.
Replace.
Replace.