All wheel drive SUBARU LEGACY 1996 Service User Guide

Symptom and possible cause Remedy
5. Noises when cornering


1Damaged differential gear. Replace.


2Excessive wear or damage of thrust washer. Replace.


3Broken pinion mate shaft. Replace.


4Seized or damaged side bearing. Replace.
6. Gear noises
Since noises from engine, muffler, transmission, 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 coasting, 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, trying to pick up only differential noise.


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


2Improper backlash for hypoid gear. Readjust.


3Scored or chipped teeth of hypoid gear. Replace hypoid gear set.


4Seized hypoid gear. Replace hypoid gear set.


5Improper preload for front or rear bearings. Readjust.


6Seized, scored, or chipped front or rear bearing. Replace.


7Seized, scored, or chipped side bearing. Replace.


8Vibrating differential carrier. Replace.
2. Propeller Shaft
Symptom and possible cause Remedy
1. Vibration of propeller shaft
Vibration is caused by propeller shaft during operation and is transferred to vehicle body. Generally vibration increase in proportion to
vehicle speed.


1Worn or damaged universal joint. Replace.


2Unbalanced propeller shaft due to bend or dent. Replace.


3Loose installation of propeller shaft. Retighten.


4Worn or damaged center bearing and damaged center mount-
ing rubber.Replace.
2. Tapping when starting and noise while cruising, caused by propeller shaft.


1Worn or damaged universal joint. Replace.


2Worn spline of sleeve yoke. Replace.


3Loose installation of propeller shaft. Retighten.


4Loose installation of joint. Replace.


5Worn or damaged center bearing and damaged center mount-
ing rubber.Replace.
NOTE:
Vibration while cruising may be caused by an unbalanced
tire, improper tire inflation pressure, improper wheel
alignment, etc.
41
3-4DIAGNOSTICS
1. Rear Differential - 2. Propeller Shaft

Symptom and possible cause Remedy
5. Noises when cornering


1Damaged differential gear. Replace.


2Excessive wear or damage of thrust washer. Replace.


3Broken pinion mate shaft. Replace.


4Seized or damaged side bearing. Replace.
6. Gear noises
Since noises from engine, muffler, transmission, 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 coasting, 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, trying to pick up only differential noise.


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


2Improper backlash for hypoid gear. Readjust.


3Scored or chipped teeth of hypoid gear. Replace hypoid gear set.


4Seized hypoid gear. Replace hypoid gear set.


5Improper preload for front or rear bearings. Readjust.


6Seized, scored, or chipped front or rear bearing. Replace.


7Seized, scored, or chipped side bearing. Replace.


8Vibrating differential carrier. Replace.
2. Propeller Shaft
Symptom and possible cause Remedy
1. Vibration of propeller shaft
Vibration is caused by propeller shaft during operation and is transferred to vehicle body. Generally vibration increase in proportion to
vehicle speed.


1Worn or damaged universal joint. Replace.


2Unbalanced propeller shaft due to bend or dent. Replace.


3Loose installation of propeller shaft. Retighten.


4Worn or damaged center bearing and damaged center mount-
ing rubber.Replace.
2. Tapping when starting and noise while cruising, caused by propeller shaft.


1Worn or damaged universal joint. Replace.


2Worn spline of sleeve yoke. Replace.


3Loose installation of propeller shaft. Retighten.


4Loose installation of joint. Replace.


5Worn or damaged center bearing and damaged center mount-
ing rubber.Replace.
NOTE:
Vibration while cruising may be caused by an unbalanced
tire, improper tire inflation pressure, improper wheel
alignment, etc.
41
3-4DIAGNOSTICS
1. Rear Differential - 2. Propeller Shaft

G4M0488
6. THRUST ANGLE

Inspection
1) Position vehicle on a level surface.
2) Move vehicle 3 to 4 meters directly forward.
3) Determine locus of both front and rear axles.
4) Measure distance“L”between center line of loci of the
axles.

Thrust angle is less than 20’when“L”is equal to or less
than 15 mm (0.59 in).

Adjustment
Make thrust angle adjustments by turning toe-in adjusting
bolts of rear suspension equally in the same direction.
NOTE:
On FWD models, turn adjusting wheels one by one, by the
some amount in the opposite direction of the adjusting
bolts.

When one rear wheel is adjusted in a toe-in direction,
adjust the other rear wheel equally in toe-out direction, in
order to make thrust angle adjustment.
When left and right adjusting bolts are turned incremen-
tally by one graduation in the same direction, the thrust
angle of the AWD model will change approximately 10’[“L”
is almost equal to 7.5 mm (0.295 in)] and the thrust angle
of the FWD model will change approximately 12’[“L”is
almost equal to 9 mm (0.35 in)].
Thrust angle:
0°±20′
B4M0193A
NOTE:
Thrust angle refers to a mean value of left and right rear
wheel toe angles in relation to vehicle body center line.
Vehicle is driven straight in the thrust angle direction while
swinging in the oblique direction depending on the degree
of the mean thrust angle.
B4M0194A
Thrust angle: r
r=αβ2
α: Right rear wheel toe angle
β: Left rear wheel toe angle
NOTE:
Here, use only positive toe-in values from each wheel to
substitute forαandβin the equation.
14
4-1SERVICE PROCEDURE
1. On-car Services

E: INSTALLATION
1) Install transverse link ball joint to housing.
Tightening torque:
44±6 N⋅m (4.5±0.6 kg-m, 32.5±4.3 ft-lb)
2) While aligning alignment mark on camber adjusting bolt
head, connect housing and strut.
CAUTION:
Use a new self-locking nut.
Tightening torque:
147±15 N⋅m (15±1.5 kg-m, 108±11 ft-lb)
3) Install speed sensor and harness on housing (only
vehicle equipped with A.B.S.).
4) Install disc rotor on hub.
5) Install disc brake caliper on housing.
Tightening torque:
59±10 N⋅m (6±1 kg-m, 43±7 ft-lb)
6) Install front drive shaft.
7) Connect stabilizer link.
G4M0236
8) Install tie-rod end ball joint on housing knuckle arm.
Tightening torque:
27.0±2.5 N⋅m (2.75±0.25 kg-m, 19.9±1.8 ft-lb)
G4M0237
9) While depressing brake pedal, tighten axle nut and lock
it securely.
Tightening torque:
186±20 N⋅m (19±2 kg-m, 137±14 ft-lb)
CAUTION:
Use a new axle nut.
Always tighten axle nut before installing wheel on
vehicle. If wheel is installed and comes in contact with
ground when axle nut is loose, wheel bearings may be
damaged.
Be sure to tighten axle nut to specified torque. Do
not overtighten it as this may damage wheel bearing.
15
4-2SERVICE PROCEDURE
1. Front Axle

G4M0238
10) After tightening axle nut, lock it securely.
11) Install wheel and tighten wheel nuts to specified
torque.
Tightening torque:
88±10 N⋅m (9±1 kg-m, 65±7 ft-lb)
2. Rear Axle (AWD Model)
A: REMOVAL
1) Disconnect ground cable from battery.
2) Jack-up vehicle, and remove rear wheel cap and
wheels.
CAUTION:
Be sure to loosen and retighten axle nut after remov-
ing wheel from vehicle. Failure to follow this rule may
damage wheel bearings.
3) Unlock axle nut.
4) Remove axle nut using a socket wrench.
B4M0050A
5) Return parking brake lever and loosen adjusting nut.
(1) Disc brake: Perform steps 6) and 7).
(2) Drum brake: Perform steps 8) through 10).
G4M0240
6) Remove disc brake caliper from back plate, and sus-
pend it from strut using a piece of wire.
7) Remove disc rotor from hub.
NOTE:
If disc rotor seizes up within hub, drive it out by installing
an 8-mm bolt into bolt hole in disc rotor.
16
4-2SERVICE PROCEDURE
1. Front Axle - 2. Rear Axle (AWD Model)

G4M0238
10) After tightening axle nut, lock it securely.
11) Install wheel and tighten wheel nuts to specified
torque.
Tightening torque:
88±10 N⋅m (9±1 kg-m, 65±7 ft-lb)
2. Rear Axle (AWD Model)
A: REMOVAL
1) Disconnect ground cable from battery.
2) Jack-up vehicle, and remove rear wheel cap and
wheels.
CAUTION:
Be sure to loosen and retighten axle nut after remov-
ing wheel from vehicle. Failure to follow this rule may
damage wheel bearings.
3) Unlock axle nut.
4) Remove axle nut using a socket wrench.
B4M0050A
5) Return parking brake lever and loosen adjusting nut.
(1) Disc brake: Perform steps 6) and 7).
(2) Drum brake: Perform steps 8) through 10).
G4M0240
6) Remove disc brake caliper from back plate, and sus-
pend it from strut using a piece of wire.
7) Remove disc rotor from hub.
NOTE:
If disc rotor seizes up within hub, drive it out by installing
an 8-mm bolt into bolt hole in disc rotor.
16
4-2SERVICE PROCEDURE
1. Front Axle - 2. Rear Axle (AWD Model)

8) Remove brake drum from hub.
G4M0242
9) If it is difficult to remove brake drum, remove adjusting
hole cover from back plate, and then turn adjusting screw
using a slot-type screwdriver until brake shoe separates
from the drum.
G4M0243
NOTE:
If brake drum is difficult to remove, drive it out by installing
an 8-mm bolt into bolt hole in brake drum.
G4M0244
10) Using a flare-nut wrench, disconnect brake pipe from
wheel cylinder.
CAUTION:
Cover open end of wheel cylinder to prevent entry of
foreign particles.
G4M0241
11) Disconnect parking brake cable end.
17
4-2SERVICE PROCEDURE
2. Rear Axle (AWD Model)

Drum brake: Perform steps 9) through 11).
9) Clean brake pipe connection. Using a flare-nut wrench,
connect brake pipe to wheel cylinder.
10) Connect parking brake cable to lever.
11) Install brake drum on rear housing assembly.
12) Bleed air from brake system.
13) Adjust parking brake lever stroke by turning adjuster.
14) Move brake lever back to apply brakes. While
depressing brake pedal, tighten axle nut using a socket
wrench. Lock axle nut after tightening.
Tightening torque:
186±20 N⋅m (19±2 kg-m, 137±14 ft-lb)
CAUTION:
Use a new axle nut.
Always tighten axle nut before installing wheel on
vehicle. If wheel is installed and comes in contact with
ground when axle nut is loose, wheel bearings may be
damaged.
Be sure to tighten axle nut to specified torque. Do
not overtighten it as this may damage wheel bearing.
15) Install wheel and tighten wheel nuts to specified
torque.
Tightening torque:
88±10 N⋅m (9±1 kg-m, 65±7 ft-lb)
3. Rear Axle (FWD Model)
A: REMOVAL
1) Disconnect ground cable from battery.
2) Jack-up vehicle, and remove rear wheel cap and
wheels.
CAUTION:
Be sure to loosen and retighten axle nut after remov-
ing wheel from vehicle. Failure to follow this rule may
damage wheel bearings.
3) Pry hub cap off with a screwdriver placed between it
and hub.
4) Unlock axle nut.
5) Remove axle nut using a socket wrench. Remove
washer.
CAUTION:
Do not re-use old axle nut. Replace with a new one.
NOTE:
Temporarily tighten axle nut to hold hub in place.
23
4-2SERVICE PROCEDURE
2. Rear Axle (AWD Model) - 3. Rear Axle (FWD Model)

Drum brake: Perform steps 9) through 11).
9) Clean brake pipe connection. Using a flare-nut wrench,
connect brake pipe to wheel cylinder.
10) Connect parking brake cable to lever.
11) Install brake drum on rear housing assembly.
12) Bleed air from brake system.
13) Adjust parking brake lever stroke by turning adjuster.
14) Move brake lever back to apply brakes. While
depressing brake pedal, tighten axle nut using a socket
wrench. Lock axle nut after tightening.
Tightening torque:
186±20 N⋅m (19±2 kg-m, 137±14 ft-lb)
CAUTION:
Use a new axle nut.
Always tighten axle nut before installing wheel on
vehicle. If wheel is installed and comes in contact with
ground when axle nut is loose, wheel bearings may be
damaged.
Be sure to tighten axle nut to specified torque. Do
not overtighten it as this may damage wheel bearing.
15) Install wheel and tighten wheel nuts to specified
torque.
Tightening torque:
88±10 N⋅m (9±1 kg-m, 65±7 ft-lb)
3. Rear Axle (FWD Model)
A: REMOVAL
1) Disconnect ground cable from battery.
2) Jack-up vehicle, and remove rear wheel cap and
wheels.
CAUTION:
Be sure to loosen and retighten axle nut after remov-
ing wheel from vehicle. Failure to follow this rule may
damage wheel bearings.
3) Pry hub cap off with a screwdriver placed between it
and hub.
4) Unlock axle nut.
5) Remove axle nut using a socket wrench. Remove
washer.
CAUTION:
Do not re-use old axle nut. Replace with a new one.
NOTE:
Temporarily tighten axle nut to hold hub in place.
23
4-2SERVICE PROCEDURE
2. Rear Axle (AWD Model) - 3. Rear Axle (FWD Model)

G4M0271
NOTE:
If brake drum seizes up within hub, drive it out by installing
an 8-mm bolt in bolt hole on brake drum.
12) Disconnect end of parking brake cable.
13) Using a flare-nut wrench, disconnect brake pipe from
wheel cylinder.
CAUTION:
Cover brake pipe connection to prevent entry of for-
eign particles.
G4M0273
14) Remove bolts which secure trailing link assembly to
rear spindle.
CAUTION:
Discard old self-locking nut. Replace with a new one.
G4M0272
15) Remove bolts which secure lateral link assembly to
rear spindle.
CAUTION:
Discard old self-locking nut. Replace with a new one.
G4M0249
16) Remove bolts which secure strut assembly to rear
spindle.
Remove rear spindle, back plate and hub as a unit.
G4M0275
B: DISASSEMBLY
1) Remove hub from rear spindle.
25
4-2SERVICE PROCEDURE
3. Rear Axle (FWD Model)