Subaru LEGACY 2006 Manual page 3859

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DIFFERENTIALS
9. General Diagnostic Table
A: INSPECTION
Symptom or trouble
1. Oil leakage
2. Seizure
NOTE:
Seized or damaged parts should be re-
placed, and also other parts should be thor-
oughly checked for any defect and should
be repaired or replaced as required.
3. Damage
NOTE:
Damaged parts should be replaced, and
also other parts should be thoroughly
checked for any defect and should be re-
paired or replaced as required.
4. Noises when starting or shifting
gears
NOTE:
Noises may be caused by differential as-
sembly, universal joint, wheel bearing, etc.
Find out what is actually making noise be-
fore disassembling.
5. Noises when cornering
6. Gear Noise
NOTE:
Since noises from engine, muffler, trans-
mission, propeller shaft, wheel bearings,
tires, and body are sometimes mistaken for
noises from differential assembly, be care-
ful in checking them. Inspection methods to
locate noises include coasting, accelerat-
ing, cruising, and jacking-up all four wheels.
Perform these inspections according to the
condition of trouble. When listening to nois-
es, shift gears into four wheel drive and
fourth speed position, trying to pick up only
differential noise.
General Diagnostic Table
Possible cause
(1) Worn, scratched, or incorrectly
seated front or side oil seal. Scored, bat-
tered or excessively worn sliding surface
of companion flange.
(2) Clogged or damaged air breather.
(3) Loose bolts on differential spindle or
side retainer, or incorrectly fitted O-ring.
(4) Loose rear cover attaching bolts or
damaged gasket.
(5) Loose oil filler or drain plug.
(6) Wear, damage or incorrect fitting of
spindle, side retainer or oil seal.
(1) Insufficient backlash for hypoid gear.
(2) Excessive preload for side, rear or
front bearing.
(3) Insufficient or improper oil used.
(1) Improper backlash for hypoid gear.
(2) Insufficient or excessive preload for
side, rear or front bearing.
(3) Excessive backlash for differential
gear.
(4) Loose bolts and nuts such as hypoid
driven gear bolt
(5) Damage due to overloading.
(1) Excessive backlash for hypoid gear.
(2) Excessive backlash for differential
gear.
(3) Insufficient preload for front or rear
bearing.
(4) Loose drive pinion nut.
(5) Loose bolts and nuts such as side
bearing retainer attaching bolt.
(1) Damaged differential gear.
(2) Excessive wear or damage of thrust
washer.
(3) Broken pinion mate shaft.
(4) Seized or damaged side bearing.
(1) Improper tooth contact of hypoid
gear.
(2) Improper backlash of the hypoid gear. Readjust.
(3) Scored or chipped teeth of hypoid
gear.
(4) Seized hypoid gear.
(5) Improper preload for front or rear
bearings.
(6) Seized, cut-away or chipped front or
rear bearing.
(7) Seized, cut-away or chipped side
bearing.
(8) Vibrating differential gear.
DI-78
Remedy
Correct or replace.
Clean, repair or replace.
Tighten the bolts to specified torque.
Replace the O-ring.
Tighten the bolts to specified torque.
Replace gasket and apply liquid gasket.
Retighten and apply liquid gasket.
Correct or replace.
Readjust or replace.
Readjust or replace.
Replace seized part and fill with speci-
fied oil to specified level.
Replace.
Readjust or replace.
Replace gear or thrust washer.
Retighten.
Replace.
Readjust.
Replace gear or thrust washer.
Readjust.
Tighten to the specified torque.
Tighten to the specified torque.
Replace.
Replace.
Replace.
Replace.
Readjust or replace hypoid gear set.
Replace hypoid gear set.
Replace hypoid gear set.
Readjust.
Replace.
Replace.
Replace.