Subaru 2009 IMPREZA Service Manual page 2317

8. 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 cap. Clean, repair or replace.
(3) Loose bolts on side retainer, or incor-
rectly fitted O-ring.
(4) Loose rear cover attachment bolts or
damaged gasket.
(5) Loose oil filler or drain plug.
(6) Wear, damage or incorrect fitting of
drive shaft, 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) Improper tooth contact of hypoid gear. Readjust. (Drive pinion shim adjustment,
(2) Excessive backlash for hypoid gear.
(3) Insufficient preload for front or rear
bearing.
(4) Loose drive pinion nut.
(5) Loose bolts and nuts such as side
retainer attachment bolt.
(6) Excessive backlash for differential
gear.
(1) Damaged differential gear.
(2) Excessive wear or damage of thrust
washer.
(3) Broken pinion mate shaft.
(4) Seized or damaged side bearing.
DI-39
DIFFERENTIALS
Remedy
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.
Repair or replace.
Readjust or replace.
Readjust or replace.
Add the recommended oil to the specified
level.
Replace.
Readjust or replace.
Replace gear or thrust washer.
Retighten.
Replace.
backlash adjustment)
Replace the gear or the pinion height
adjusting washer.
Readjust.
Tighten to the specified torque.
Tighten to the specified torque.
Replace gear or thrust washer.
Replace.
Replace.
Replace.
Replace.