Subaru Legacy IV (2008 year). Manual - part 885

DI-89

Rear Differential Front Member

DIFFERENTIALS

8. Rear Differential Front Member

A: REMOVAL

1) Disconnect the ground cable from the battery.
2) Lift up the vehicle.
3) Support the rear differential using transmission
jack, and then remove the rear differential front
member.

B: INSTALLATION

Using new self-locking nuts, install the rear differ-
ential front member.

Tightening torque:

T1: 50 N·m (5.1 kgf-m, 36.9 ft-lb)
T2: 110 N·m (11.2 kgf-m, 81.1 ft-lb)

C: INSPECTION

1) Check the rear differential front member for
damage, bend and corrosion.
If damage, bend or corrosion is excessive, replace
the rear differential front member.
2) Check the bushings of rear differential member
for cracking, hardening and damage.
If cracking, hardening or damage is excessive, re-
place rear differential front member.

(A) Rear differential front member

DI-00293

(A)

DI-00294

T2

T1

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General Diagnostic Table

DIFFERENTIALS

9. General Diagnostic Table

A: INSPECTION

Symptom or trouble

Possible cause

Remedy

1. Oil leakage

(1) Worn, scratched, or incorrectly seated 
front or side oil seal. Scored, battered or 
excessively worn sliding surface of com-
panion flange.

Repair or replace.

(2) Clogged or damaged air breather.

Clean, repair or replace.

(3) Loose bolts on side retainer, or incor-
rectly fitted O-ring.

Tighten the bolts to specified torque. 
Replace the O-ring.

(4) Loose rear cover attaching bolts or 
damaged gasket.

Tighten the bolts to specified torque. 
Replace gasket and apply liquid gasket.

(5) Loose oil filler or oil drain plug.

Retighten and apply liquid gasket.

(6) Wear, damage or incorrect fitting of 
side retainer or oil seal.

Repair or replace.

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.

(1) Insufficient backlash for hypoid gear.

Readjust or replace.

(2) Excessive preload for side, rear or 
front bearing.

Readjust or replace.

(3) Insufficient or improper oil used.

Add specified oil to the specified level.

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.

(1) Improper backlash for hypoid gear.

Replace.

(2) Insufficient or excessive preload for 
side, rear or front bearing.

Readjust or replace.

(3) Excessive backlash for differential 
gear.

Replace gear or thrust washer. (For T-
type (except for GT spec. B 6MT model), 
replace the differential case assembly.)

(4) Loose bolts and nuts such as hypoid 
driven gear bolt

Retighten.

(5) Damage due to overloading.

Replace.

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.

(1) Excessive backlash for hypoid gear.

Readjust.

(2) Improper tooth contact of the hypoid 
gear

Readjust. (Drive pinion adjustment and 
backlash adjustment)

(3) Excessive backlash for differential 
gear.

Replace gear or thrust washer. (For T-
type (except for GT spec. B 6MT model), 
replace the differential case assembly.)

(4) Insufficient preload for front or rear 
bearing.

Readjust.

(5) Loose drive pinion nut.

Tighten to the specified torque.

(6) Loose bolts and nuts such as side 
retainer attachment bolt.

Tighten to the specified torque.

5. Noises when cornering

(1) Damaged differential gear.

Replace. (For T-type (except for GT spec. 
B 6MT model), replace the differential 
case assembly.)

(2) Excessive wear or damage of thrust 
washer.

Replace.

(3) Broken pinion mate shaft.

Replace.

(4) Seized or damaged side bearing.

Replace.

DI-91

General Diagnostic Table

DIFFERENTIALS

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 
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 the condition of trouble. 
When listening to noises, shift gears into 
four wheel drive and fourth speed posi-
tion, trying to pick up only differential 
noise.

(1) Improper tooth contact of hypoid gear. Readjust or replace hypoid gear set.

(2) Improper backlash of the hypoid gear.

Readjust.

(3) Scored or chipped teeth of hypoid 
gear.

Replace hypoid gear set.

(4) Seized hypoid gear.

Replace hypoid gear set.

(5) Improper preload for front or rear 
bearings.

Readjust.

(6) Seized, cut-away or chipped front or 
rear bearing.

Replace.

(7) Seized, cut-away or chipped side 
bearing.

Replace.

(8) Vibrating differential gear.

Replace. (For T-type (except for GT spec. 
B 6MT model), replace the differential 
case assembly.)

Symptom or trouble

Possible cause

Remedy

DI-92

General Diagnostic Table

DIFFERENTIALS