Mitsubishi Evolution X. Manual — part 870

SERVICE SPECIFICATIONS

TSB Revision

POWER STEERING

37-3

SERVICE SPECIFICATIONS

M1372000301390

Item

Standard value

Limit

Steering wheel free
play mm (inch)

With engine running

−

30 (1.2)

With engine stopped

16.5 (0.6) or less

−

Steering angle

Inside wheel

° 10' ± 1° 30'

−

Outside wheel (reference value)

° 10'

−

Toe-in mm (in)

± 2 (0 ± 0.07)

−

Tie rod end ball joint breakaway torque N

⋅ m (in-lb)

2.9 (26) or less

−

Engine idle speed r/min

700

± 50

−

Stationary steering effort N (lb) [Fluctuation allowance N (lb)]

32 (7.2) or less
[5.9 (1.33) or less]

−

Oil pump pressure
MPa (psi)

Oil pump relief pressure

8.1

− 8.8 (1,174 − 1,276) −

Pressure under no-load conditions

1.0 (144)

−

Steering gear retention hydraulic pressure 8.1

− 8.8 (1,174 − 1,276) −

Steering gear total pinion torque N

⋅ m (in-lb) [Change in torque

⋅ m (in-lb)]

0.6

− 2.0 (5.2 − 17.6)

[0.4 (3.5) or less]

−

Band crimped width mm (in)

2.4

− 2.8 (0.09 − 0.11)

−

LUBRICANTS

M1372000400822

Item

Specified lubricant

Quantity dm

(qt)

Power steering fluid

Genuine Mitsubishi Power
Steering Fluid

1.0 (1.06)

Steering gear

Bearing

Genuine Mitsubishi Power
Steering Fluid

As required

O-ring and seal ring
Oil seal
Special tool (MB991213)
Pinion and valve assembly
seal ring part
Bellows

Silicon grease

As required

Oil pump

Friction surface of rotor vane,
cam ring and pump cover

Genuine Mitsubishi Power
Steering Fluid

As required

O-ring

SEALANTS

M1372000500852

Item

Specified sealant

Steering gear

Bellows

™ AAD Part No.8663 or equivalent

POWER STEERING DIAGNOSIS

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POWER STEERING

37-4

POWER STEERING DIAGNOSIS

INTRODUCTION TO POWER STEERING DIAGNOSIS

M1372008500254

Hydraulic power steering is used for all vehicles.
Faults in the power steering can include excessive
play of the steering wheel, difficult steering wheel
operation, noise, vibration, and oil leaks, etc. Possi-
ble causes of these faults can include defects in the
gear box, oil pump or steering linkage.

POWER STEERING DIAGNOSIS TROUBLESHOOTING STRATEGY

M1372007300291

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
power steering 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

Chart.

4. Verify malfunction is eliminated.

SYMPTOM CHART

M1372007600366

Symptom

Inspection
procedure

Reference page

Excessive play of steering wheel

P.37-5

Difficult steering wheel operation (insufficient power assist)

Rattling noise

Shrill noise

Squealing noise

Hissing noise

Droning noise

Squeaking noise

Vibration

Oil leakage from hose connection

P.37-10

Oil leakage from hose assembly

P.37-11

Oil leakage from oil reservoir

P.37-11

Oil leakage from oil pump

P.37-11

Oil leakage from steering gear

P.37-12

POWER STEERING DIAGNOSIS

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POWER STEERING

37-5

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Excessive Play of Steering Wheel

DIAGNOSIS

STEP 1. Check for looseness at the steering shaft coupling
section and at the steering wheel linkage.
Q: Is there any looseness?

YES : Repair or replace the part. Then go to Step 3.
NO : Go to Step 2.

STEP 2. Check the steering wheel free play.
(1) With the engine running (hydraulic operation), set the front

wheels straight ahead.

AC609390AB

(2) Measure the play on the steering wheel circumference

before the wheels start to move when slightly moving the
steering wheel in both directions.

Limit: 30 mm (1.2 inch)

(3) If the free play exceeds the limit value, set the steering

wheel straight ahead with the engine stopped. Load
approximately 5 N (1.1 pound) towards the steering
circumference and check the play.

Standard value (steering wheel play with engine
stopped): 16.5 mm (0.6 inch) or less

Q: Does the play exceed the standard value?

YES : Remove the steering gear box (Refer to

P.37-31

) and

check the total pinion torque (Refer to

P.37-31

). Then

go to Step 3.

NO : Go to Step 3.

STEP 3. Check the steering wheel play.
Verify that the steering wheel play is not excessive.
Q: Is the steering wheel play excessive?

YES : Repeat from Step 1.
NO : The procedure is complete.

POWER STEERING DIAGNOSIS

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POWER STEERING

37-6

INSPECTION PROCEDURE 2: Difficult Steering Wheel Operation (Insufficient Power Assist)

DIAGNOSIS

STEP 1. Check the power steering oil pump drive belt
tension.
Refer to GROUP 00, Maintenance Service

− Drive Belts

P.00-66

Q: Is the power steering oil pump drive belt tension within

the standard value?
YES : Go to Step 2.
NO : Adjust the tension (Refer to GROUP 00, Maintenance

Service

− Drive Belts

P.00-66

). Then go to Step 10.

STEP 2. Check the drive belt for damage.
Q: Is the drive belt damaged?

YES : Replace the drive belt. Then go to Step 10.
NO : Go to Step 3.

STEP 3. Check the fluid level.
(1) Park the vehicle on a flat, level surface, and then start the

engine.

(2) Turn the steering wheel several times to raise the

temperature of the fluid to approximately 50

− 60° C (122 −

140

° F).

(3) With the engine running, turn the wheel all the way to the

left and right several times.

AC608306

With engine stopped

Fluid level change: Within 5 mm (0.2 in)

With engine running

(4) Check the fluid in the oil reservoir for foaming or milkiness.

Check the difference of the fluid level when the engine is
stopped, and while it is running. If the change of the fluid
level is 5 mm (0.2 inch) or more, bleed the air from the
system (Refer to

P.37-19

Q: Is the fluid foamy?

YES : Go to Step 4.
NO : Go to Step 10.

STEP 4. Check for entry of air.
Q: Has air entered?

YES : Bleed the air (Refer to

P.37-19

). Then go to Step 10 .

NO : Go to Step 5.

STEP 5. Check each hose for crushing or twisting.
Q: Is any hose crushed or twisted?

YES : Repair or replace the hose. Then go to Step 10.
NO : Go to Step 6.

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