Mitsubishi 380. Manual - part 837

 

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Mitsubishi 380. Manual - part 837

 

 

GENERAL DESCRIPTION

FRONT SUSPENSION

33-2

GENERAL DESCRIPTION

M1332000100270

The front suspension is a McPherson strut with coil 
spring. The shock absorber is gas-filled hydraulic 
double-tube type.

.

CONSTRUCTION DIAGRAM

FRONT SUSPENSION DIAGNOSIS

INTRODUCTION TO FRONT SUSPENSION DIAGNOSIS

M1332009000269

If the front suspension is faulty, the vehicle will not 
run straightforward or noise will occur. Incorrect 
wheel alignment, malfunction of strut assembly, sta-
bilizer bar, coil spring, or worn or out-of-balance tyres 
can cause these problems.

FRONT SUSPENSION DIAGNOSIS TROUBLESHOOTING STRATEGY

M1332009100255

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

2. Verify that the condition described by the 

customer exists.

3. Find and repair the malfunction by following the 

Symptom Chart and Symptom Procedures.

4. Verify malfunction is eliminated.

AC305733 AB

STABILIZER BAR

COIL SPRING

STABILIZER LINK

STRUT ASSEMBLY

FRONT AXLE No.1 
CROSSMEMBER

LOWER ARM ASSEMBLY

CENTER MEMBER

FRONT AXLE 
CROSSMEMBER 
STAY <3.8L ENGINE>

FRONT SUSPENSION DIAGNOSIS

FRONT SUSPENSION

33-3

SYMPTOM CHART

M1332009400290

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Steering Wheel is Heavy, Vibrates or Pulls to One Side

DIAGNOSIS

STEP 1. Check the tyres.
Check for the tyre pressure, the tyre pressure bal-
ance between left and right tyres, and the tyre condi-
tion. Refer to GROUP 31, Diagnosis 

P.31-2

.

Q: Are the tyres in normal condition?

YES : 

Go to Step 2.

NO : 

If out of pressure, adjust the tyre pressure. If 
out of balance, balance the tyres as 
necessary. If excessively worn, replace the 
tyres as necessary and then go to Step 5.

STEP 2. Check the wheel alignment.
Refer to 

P.33-6

.

Q: Is the wheel alignment correct?

YES : 

Go to Step 3.

NO : 

Adjust it, and then go to Step 5.

STEP 3. Check the lower arm ball joint.

Q: Is the ball joint in good condition?

YES : 

Go to Step 4.

NO : 

Replace the lower arm assembly, and then 
go to Step 5.

STEP 4. Check the coil spring.

Q: Is the coil spring in good condition?

YES : 

Go to Step 5.

NO : 

Replace it, and then go to Step 5.

STEP 5. Retest the system.

Q: Is the malfunction eliminated?

YES : 

The procedure is complete.

NO : 

Return to Step 1.

INSPECTION PROCEDURE 2: Excessive Body Rolling

DIAGNOSIS

STEP 1. Check for broken or deteriorated 
stabilizer bar.

Q: Is the stabilizer bar in good condition?

YES : 

Go to Step 2.

NO : 

Replace it, and then go to Step 3.

STEP 2. Check the strut assembly for damage.

Q: Is the strut assembly in good condition?

YES : 

Go to Step 3.

NO : 

Replace it, and then go to Step 3.

STEP 3. Retest the system.

Q: Is the malfunction eliminated?

YES : 

The procedure is complete.

NO : 

Return to Step 1.

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE PAGE

Steering wheel is heavy, vibrates or pulls to one side

1

 

P.33-3

Excessive body rolling

2

 

P.33-3

Poor ride

3

 

P.33-4

Unequal ride height

4

 

P.33-4

Noise

5

 

P.33-4

FRONT SUSPENSION DIAGNOSIS

FRONT SUSPENSION

33-4

INSPECTION PROCEDURE 3: Poor Ride

DIAGNOSIS

STEP 1. Check for improper tyre inflation 
pressure.
Refer to GROUP 31, On-vehicle Service 

− Tyre Infla-

tion Pressure Check 

P.31-7

.

Q: Is the tyre inflation correct?

YES : 

Go to Step 2.

NO : 

Adjust it, and then go to Step 4.

STEP 2. Check for broken or deteriorated coil 
spring(s).

Q: Are the coil spring(s) broken or deteriorated?

YES : 

Replace the coil spring(s), and then go to 

Step 4.

NO : 

Go to Step 3.

STEP 3. Check for strut assembly damage.

Q: Is the strut assembly damaged?

YES : 

Replace it, and then go to Step 4.

NO : 

Go to Step 4.

STEP 4. Retest the system.

Q: Is the malfunction eliminated?

YES : 

The procedure is complete.

NO : 

Return to Step 1.

INSPECTION PROCEDURE 4: Unequal Ride Height

DIAGNOSIS

STEP 1. Check for broken or deteriorated coil 
spring(s).

Q: Is the coil spring(s) broken or deteriorated?

YES : 

Replace it, and then go to Step 2.

NO : 

Go to Step 2.

STEP 2. Retest the system.

Q: Is the malfunction eliminated?

YES : 

The procedure is complete.

NO : 

Return to Step 1.

INSPECTION PROCEDURE 5: Noise

DIAGNOSIS

STEP 1. Check for lack of lubrication.

Q: Is lubrication inadequate?

YES : 

Lubricate it, and then go to Step 5.

NO : 

Go to Step 2.

STEP 2. Check the tightened parts for looseness 
and check the bushings for wear.

Q: Are the tightened parts and bushings in good 

condition?
YES : 

Go to Step 3.

NO : 

Tighten or replace as necessary, then go to 
Step 5.

STEP 3. Check for broken coil springs.

Q: Is the coil spring broken?

YES : 

Replace it, and then go to Step 5.

NO : 

Go to Step 4.

STEP 4. Check for strut assembly damage.

Q: Is the strut assembly damaged?

YES : 

Replace it, and then go to Step 5.

NO : 

Go to Step 5.

STEP 5. Retest the system.

Q: Is the malfunction eliminated?

YES : 

The procedure is complete.

NO : 

Return to Step 1.

SPECIAL TOOLS

FRONT SUSPENSION

33-5

SPECIAL TOOLS

M1332000600327

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991004
Wheel alignment gauge 
attachment

MB991004-01 or General 
service tool

Wheel alignment 
measurement

MB991832
Spring compressor set

• A: MB991793

Spring compressor

• B: MB991795

Attachment A

• C: MB991794

Upper plate

• D: MB991829

Arm bracket

• E: MB991831

Spacer

• F: MB991830

Fixture

General service tool

Front coil spring 
compression

NOTE: The coil spring can 
not be compressed by 
following conventional 
special tools.

.

• MB991237

Spring compressor 
body

• MB991238

Arm set

MB991680
Wrench set

• A: MB991681

Wrench

• B: MB991682

Socket

Strut assembly 
disassembly and 
assembly

MB991897
Ball joint remover

MB991113-01, 
MB990635-01 or General 
service tool

Ball joint disconnection

NOTE: Steering linkage 
puller (MB990635 or 
MB991113) is also 
available to disconnect 
knuckle and ball joint.

MB990326
Preload socket

General service tool

Ball joint breakaway 
torque check

MB990776
Front axle base

MB990776-01

Lower arm ball joint dust 
cover installation

MB991004

MB991832

A

B

C

D

E

F

MB991680

A

B

AC106827

MB990326

MB990776

 

 

 

 

 

 

 

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