Mitsubishi Montero (2002-2004). Manual — part 415

WHEEL AND TIRE DIAGNOSIS

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WHEEL AND TIRE

31-3

Wear on one
side

Excessive
camber

Check the camber.

Refer to GROUP
33A, On-vehicle
service

− Front

wheel alignment
check and
adjustment

P.33A-

5

.

Feathered
edge

Incorrect toe-in

Adjust the toe-in.

Bald spots

Unbalanced
wheel

Balance the wheels.

−

Scalloped
wear

Lack of rotation of tires or worn
or out-of-alignment suspension

Rotate the tires, and
check the front
suspension
alignment.

Refer to GROUP
33A, On-vehicle
service

− Front

wheel alignment
check and
adjustment

P.33A-

5

.

SYMPTOM

PROBABLE CAUSE

REMEDY

REFERENCE
PAGE

ACX00928 AB

ACX00929 AB

ACX00930AB

ACX00931AB

ACX00932AB

ACX00933 AB

ACX00934

WHEEL AND TIRE DIAGNOSIS

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WHEEL AND TIRE

31-4

WHEEL BALANCE ACCURACY AND TIRE RADIAL-FORCE VARIATION CHECK

M1311001900100

WHEEL BALANCE ACCURACY

.

PURPOSE
This section contains tips and procedures for achiev-
ing accurate wheel balance. Steering wheel vibration
and/or body shake can result if any of these proce-
dures are not carefully observed.
1. Wheels and tires must be properly mounted on a

balancer in order to achieve correct balance.
Centering the wheel on the shaft of the balancer is
essential for proper mounting.

2. Off-the-car wheel balancers must be calibrated

periodically to ensure good balancing results. An
inaccurately calibrated balancer could cause
unnecessary replacement of tires, shocks,
suspension components, or steering components.

Check your balancer's calibration approximately
every 100 balances. Your wheel balancer's instruc-
tion manual should include calibration procedures. If
the calibration procedures specifically for your bal-
ancer are missing, use the generic steps in this sec-
tion for zero calibration, static balance, and dynamic
balance checks. The wheel balancer calibration
checks are also described in the flowchart. (Refer to

P.31-6

.)

.

PROCEDURE <Balancing Tips>
1. Confirm that the balancer's cone and the wheel

mounting cone are undamaged and free of dirt
and rust.

2. On this vehicle, the wheel's center hole on the

hub side has a chamfered edge. Use a back-
mounting cone on your wheel balancer to center
the wheel on the balancer shaft.

3. Install a wheel mounting cone. The appropriate

size cone for this vehicle is 67.0 mm (2.64
inches).

4. Before balancing the wheel, remove any wheel

weights from both sides. Also check both sides for
any damage.

5. When installing wheel weights, hammer them at a

straight (not diagonal) angle.

.

<Confirming Proper Balance>
1. After balancing the wheel, loosen the wing nut

and turn the wheel 180 degree angle against the
balancer's hub. Then re-tighten the wing nut and
check the balance again. Repeat wheel balance if
necessary.

2. Turn the wheel again 180 degree angle against

the balancer's hub. If the wheel becomes out-of-
balance each time it is turned against the
balancer's hub, the wheel balancer may require
calibration.

.

<Wheel Balancer Calibration Checks>
1. Mount an undamaged original-equipment alloy

rim and tire assembly (wheel) onto your off-the-
car wheel balancer. Balance the wheel.

2. <<Zero Calibration Check>>

Loosen the balancer wing nut, rotate the wheel a
half-turn (180 degree angle), and retighten the
nut. Recheck the balance.

• If the imbalance is 5 g (0.18 ounce) or less, the

zero calibration is OK. Rebalance the wheel, then
go to Step 4 to check static balance.

AC000041AB

HUB/SHAFT
ASSEMBLY

CLAMPING CUP

WING NUT

STANDARD PASSENGER
CAR WHEEL

WHEEL
MOUNTING
CONE

SPRING PLATE

WHEEL AND TIRE DIAGNOSIS

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WHEEL AND TIRE

31-5

• If the imbalance is more than 5 g (0.18 ounce), go

to Step 3.

3. Loosen the balancer wing nut, rotate the wheel 1/

4 turn (90 degree angle), and retighten the nut.
Recheck the wheel balance.

• If the imbalance is 5 g (0.18 ounce) or less, the

wheel may not be centered on the balancer, or
the balancing cones, the cup, and/or wing nut are
damaged, dirty, or inappropriate for the wheel.
You may need to refer to the balancer manufac-
turer's instructions to verify the correct attach-
ments. After making the necessary corrections,
recheck the wheel balance. If OK, then go to Step
4.

• If the imbalance is more than 5 g (0.18 ounce),

the balancer requires calibration. Contact the bal-
ancer manufacturer for calibration by their repair
representative.

4. <<Static Balance Check>>

Attach a 5-g (0.18-ounce) weight to the outer rim.
Recheck the balancer. The balancer should
detect 5

± 2 g (0.18 ± 0.06 ounce) of imbalance

170 to 190 degree angle away from the 5-g (0.18-
ounce) weight.

• If the imbalance is within specification, the static

balance calibration is correct. Go to Step 5 to
check the dynamic balance.

• If the imbalance is out of specification, the bal-

ancer requires calibration. Contact the balancer
manufacturer for calibration by their repair repre-
sentative.

5. <<Dynamic Balance Check>>

Attach a 5-g (0.18-ounce) weight to the inner rim
at 180 degree angle opposite the 5-g (0.18-
ounce) weight that was added in Step 4. Recheck
the balance. The balancer should detect 5

± 2 g

(0.18

± 0.06 ounce) of imbalance 170 to 190

degree angle away from both the inner and outer
5-g (0.18-ounce) weights.

• If the imbalance is within specification, the

dynamic balance calibration is correct. The bal-
ancer calibration checks are complete.

• If the imbalance is out of specification, the bal-

ancer requires calibration. Contact the balancer
manufacturer for calibration by their repair repre-
sentative.

TIRE RADIAL-FORCE VARIATION CHECK

Measure the radial-force variation of the tires.

Maximum limit: 118 N (26.5 pounds)

If the measured value is more than the maximum
limit, try to adjust the phase between wheel and tire,
and to measure again.

If the measured value still exceeds maximum limit,
replace the tire.
NOTE: The value of maximum limit is guide-line. If
the vibration of the vehicle body is not observed, the
tire can be reused even if its measured value is more
than the maximum limit.

WHEEL AND TIRE DIAGNOSIS

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WHEEL AND TIRE

31-6

WHEEL BALANCER CALIBRATION CHECKING FLOW CHART

AC000040

Balance wheel.

Rotate wheel 1/2 turn.

Imbalance = 5g (0.18oz) or less

Imbalance = more than 5g (0.18oz)

Rebalance wheel.

Rotate wheel 1/4 turn.

Imbalance = 5g (0.18oz) or less

Imbalance = more than 5g (0.18oz)

Verify wheel is properly centered.
Verify cones, cup, and wing nut are clean,
undamaged, and appropriate for wheel.
Make necessary corrections, then recheck
wheel balance.

Attach a 5-g (0.18-oz) weight to the outer rim.
Is the imbalance 5 ± 2g (0.18 ± 0.06oz) at 170

–

190

degree angle away from the 5-g (0.18-oz) weight?

YES

NO

Attach a 5-g (0.18-oz) weight to the inner rim at 180
degree angle opposite the weight on the outer rim.
Is the imbalance 5 ± 2g (0.18 ± 0.06oz) at 170

–

190

degree angle away from both 5-g (0.18-oz) weights?

YES

NO

Balancer does not require
calibration.

Balancer requires calibration.
Contact balancer manufacturer.

ZERO CALIBRATION
CHECK

STATIC BALANCE
CHECK

DYNAMIC BALANCE
CHECK