Mitsubishi 380. Manual — part 865

WHEEL AND TYRE DIAGNOSIS

WHEEL AND TYRE

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 tyre 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 TYRE DIAGNOSIS

WHEEL AND TYRE

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.

WHEEL AND TYRE DIAGNOSIS

WHEEL AND TYRE

31-6

WHEEL BALANCER CALIBRATION CHECKING FLOW CHART

AC000040

Balance wheel.

Rotate wheel 1/2 turn.

Imbalance = 5 g (0.18 oz) or less

Imbalance = more than 5 g (0.18 oz)

Rebalance wheel.

Rotate wheel 1/4 turn.

Imbalance = 5 g (0.18 oz) or less

Imbalance = more than 5 g (0.18 oz)

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 ± 2 g (0.18 ± 0.06 oz) at 170

–

190 degrees 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
degrees opposite the weight on the outer rim.
Is the imbalance 5 ± 2 g (0.18 ± 0.06 oz) at 170

–

190 degrees 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

AD

ON-VEHICLE SERVICE

WHEEL AND TYRE

31-7

ON-VEHICLE SERVICE

TYRE INFLATION PRESSURE CHECK

M1311000900323

NOTE: For information on tyre inflation pressure, refer to the
label attached to the center pillar on the driver's side.

TYRE WEAR CHECK

M1311001000345

Measure the tread depth of the tyres.

Minimum limit: 1.6 mm (0.06 inch)

If the remaining tread depth is less than the minimum limit,
replace the tyre.

NOTE: When the tread depth of the tyres is reduced to 1.6 mm
(0.06 inch) or less, wear indicators will appear.

WHEEL RUNOUT CHECK

M1311001100364

Jack up the vehicle so that the wheels are clear of the floor.
While slowly turning the wheel, measure wheel runout with a
dial indicator.

Limit:

If wheel runout exceeds the limit, replace the wheel.

WHEEL AND TYRE

INSTALLATION SERVICE POINT

M1311001300302

Tighten the wheel nuts to the specified torque.

Tightening torque: 98

± 10 N⋅m (73 ± 7 ft-lb)

ITEM

STEEL WHEEL

ALUMINUM
WHEEL

Radial runout 1.2 mm (0.05 inch)

or less

1.0 mm (0.04 inch)
or less

Lateral
runout

1.2 mm (0.05 inch)
or less

1.0 mm (0.04 inch)
or less

ACX00651AB

LATERAL

RADIAL