Mitsubishi Galant 9G. Manual — part 478

GENERAL DESCRIPTION

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REAR AXLE

27-2

GENERAL DESCRIPTION

M1271000100326

The rear axle has the following features:

• The wheel bearing incorporates a unit ball bear-

ing (double-row angular contact ball bearing) for
reduced friction.

• The rear wheel hub assembly combines the hub,

wheel bearing, and oil seal in a single unit for
fewer parts, better durability, improved assembly
precision, and better structural organization.

• ABS rotor for detecting the wheel speeds is

press-fitted to the rear hub in vehicles with ABS.

CONSTRUCTION DIAGRAM

REAR AXLE DIAGNOSIS

INTRODUCTION TO REAR AXLE DIAGNOSIS

M1271004100254

Noise from the rear axle may be caused by defects in
the components.

REAR AXLE DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1271004200273

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
rear axle fault.
1. Gather information from the customer.

2. Verify that the condition described by the

customer exists.

3. Find the malfunction by following the Symptom

Procedures.

4. Verify malfunction is eliminated.

AC305169 AB

REAR HUB

OIL SEAL

WHEEL BEARING

ABS ROTOR

REAR AXLE DIAGNOSIS

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REAR AXLE

27-3

SYMPTOM PROCEDURES

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INSPECTION PROCEDURE 1: Abnormal Noise

DIAGNOSIS

STEP 1. Check the rear hub assembly installation bolts for
looseness.
Q: Are the rear hub assembly installation bolts loosened?

YES : Tighten the rear hub assembly installation bolts to the

specified torque 73

± 7 N⋅m (54 ± 5 ft-lb). Then go to

Step 4.

NO : Go to Step 2.

STEP 2. Check the wheel bearing end play.
(1) Remove the caliper assembly, and suspend the caliper

assembly with a wire and remove the brake disc.

(2) Check the bearing's end play. Place a dial gauge against

the hub surface; then move the hub in the axial direction
and check whether or not there is end play.

Limit: 0.05 mm (0.002 inch)

Q: Is the wheel bearing end play within the limit?

YES : Go to Step 3.
NO : Replace the rear hub assembly, then go to Step 4.

STEP 3. Check the rear hub rotary-sliding resistance.
(1) Remove the caliper assembly, and suspend the caliper

assembly with a wire and remove the brake disc.

(2) Turn the hub a few times to seat the bearing.
(3) Wind a rope around the hub bolt and turn the hub by pulling

at a 90

° angle with a spring balance. Measure to determine

whether or not the rotary-sliding resistance of the rear hub
is within the limit value.

Limit: 24 N (5.4 lbs)

Q: Is the rear hub rotary-sliding resistance within the limit?

YES : Go to Step 4.
NO : Replace the rear hub assembly, then go to Step 4 .

STEP 4. Retest the systems.
Q: Are abnormal noises generated?

YES : Return to Step 1.
NO : The procedure is complete.

AC205869AB

AC205870

SPECIAL TOOLS

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REAR AXLE

27-4

SPECIAL TOOLS

M1271000600525

ON-VEHICLE SERVICE

WHEEL BEARING END PLAY CHECK

M1271000900474

1. Remove the caliper assembly, and suspend the caliper

assembly with a wire and remove the brake disc.

2. Check the bearing's end play. Place a dial gauge against the

hub surface; then move the hub in the axial direction and
check whether or not there is end play.

Limit: 0.05 mm (0.002 inch)

3. If the play exceeds the limit, replace the rear hub assembly.
4. After having finished the inspection, install the brake disc,

caliper assembly and tighten the caliper assembly mounting
bolts to the specified torque.

Tightening torque: 60

± 5 N⋅m (45 ± 3 ft-lb)

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB990767
Front hub and flange
yoke Holder

MB990767-01

Hub fixing

MB991618
Hub bolt remover

General service tool

Hub bolt removal

MB991897
Ball joint remover

MB991113-1,
MB990635-01 or general
service tool

Ball joint disconnection
NOTE: Steering linkage
puller(MB990635 or
MB991113)is also used
to disconnect knuckle
and toe control arm ball
joint.

B990767

MB991618

AC106827

AC205869AB

ON-VEHICLE SERVICE

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REAR AXLE

27-5

REAR HUB ROTARY-SLIDING RESISTANCE
CHECK

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1. Remove the caliper assembly, and suspend the caliper

assembly with a wire and remove the brake disc.

2. Turn the hub a few times to seat the bearing.
3. Wind a rope around the hub bolt and turn the hub by pulling

at a 90 degree angle with a spring balance. Measure to
determine whether or not the rotary-sliding resistance of the
rear hub is within the limit value.

Limit: 24 N (5.4 pounds)

4. If the rotary

−sliding resistance exceeds the limit value,

replace the rear hub assembly.

5. After having finished the inspection, install the brake disc,

caliper assembly and tighten the caliper assembly mounting
bolts to the specified torque.

Tightening torque: 60

± 5 N⋅m (45 ± 3 ft-lb)

HUB BOLT REPLACEMENT

M1271001000270

Required Special Tools:

• MB990767: Front Hub and Flange Yoke Holder

• MB991618: Hub Bolt Remover

1. Remove the caliper assembly, and suspend the caliper

assembly with a wire and remove the brake disc.

2. Use special tool MB991618 to remove the hub bolts.

3. Install the plain washer to the new hub bolt, and install the

bolt with a nut while holding the hub with special tool
MB990767.

4. Install the brake disc, caliper assembly and tighten the

caliper assembly mounting bolts to the specified torque.

Tightening torque: 60

± 5 N⋅m (45 ± 3 ft-lb)

AC205870

AC302114

MB991618

AE

HUB BOLT

AC205872

MB990767

AB

PLAIN
WASHER