Subaru Legacy 2004 Service Manual page 2897

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
thoroughly checked for any defect and
should be repaired or replaced as re-
quired.
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
before disassembling.
5. Noises when cornering
General Diagnostic Table
Possible cause
(1) Worn, scratched or incorrectly seated
front or side oil seal. Scored, battered or
excessively worn sliding surface of com-
panion 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 incorrectly fitting for
spindle, side retainer and 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.
DI-76
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 specified
oil to specified level.
Replace.
Readjust or replace.
Replace gear or thrust washer.
Retightening.
Replace.
Readjust.
Replace gear or thrust washer.
Readjust.
Tighten to specified torque.
Tighten to specified torque.
Replace.
Replace.
Replace.
Replace.