Mitsubishi Galant 9G. Manual — part 1530

WHEEL AND TIRE DIAGNOSIS

TSB Revision

WHEEL AND TIRE

31-2

WHEEL AND TIRE DIAGNOSIS

DIAGNOSIS

M1311000700404

SYMPTOM

PROBABLE CAUSE

REMEDY

REFERENCE
PAGE

Rapid wear
at shoulders

Under-inflation
or lack of
rotation

Adjust the tire
pressure.

For tire inflation
pressure, refer to
the label on the
driver's side center
pillar.

Rapid wear
at center

Over-inflation
or lack of
rotation

Cracked
treads

Under-inflation

Adjust the tire
pressure.

For tire inflation
pressure, refer to
the label on the
driver's side center
pillar.

ACX00923AB

ACX00924 AB

ACX00925AB

ACX00926AB

ACX00927AB

WHEEL AND TIRE DIAGNOSIS

TSB Revision

WHEEL AND TIRE

31-3

WHEEL BALANCE ACCURACY

M1311001700258

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

.)

Wear on one
side

Excessive
camber

Check the camber.

Refer to GROUP
33, On-vehicle
Service

− Front

Wheel Alignment
Check and
Adjustment

P.33-6

.

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
33, On-vehicle
Service

− Front

Wheel Alignment
Check and
Adjustment

P.33-6

.

SYMPTOM

PROBABLE CAUSE

REMEDY

REFERENCE
PAGE

ACX00928 AB

ACX00929 AB

ACX00930AB

ACX00931AB

ACX00932AB

ACX00933 AB

ACX00934

WHEEL AND TIRE DIAGNOSIS

TSB Revision

WHEEL AND TIRE

31-4

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 degrees 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 degrees 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 degrees), 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.

• 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 degrees), 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.

AC000041AB

HUB/SHAFT
ASSEMBLY

CLAMPING CUP

WING NUT

STANDARD PASSENGER
CAR WHEEL

WHEEL
MOUNTING
CONE

SPRING PLATE

WHEEL AND TIRE DIAGNOSIS

TSB Revision

WHEEL AND TIRE

31-5

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 degrees 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 degrees 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 degrees

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.