Mitsubishi Lancer Evolution 7. Manual — part 295
WHEEL AND TYRE -
Troubleshooting
31-3
TROUBLESHOOTING
Symptom
Probable cause
Remedy
Reference page
Rapid wear at
shoulders
Under-inflation
or lack of rotation
Adjust the tyre
pressure.
31-6
Rapid wear at
centre
Over-inflation or
lack of rotation
Cracked treads
Under-inflation
Adjust the tyre
pressure.
31-6
Wear on one
side
Excessive
camber
Inspect the
camber.
Refer to
GROUP 33A -
On-vehicle
Service.
Feathered edge
Incorrect toe-in
Adjust the toe-in.
Bald spots
Unbalanced
wheel
Adjust the
imbalanced
wheels.
31-4
Scalloped wear
Lack of rotation of tyres or worn or
out-of-alignment suspension
Rotate the tyres
and check the
front suspension
alignment.
Refer to
GROUP 33A -
On-vehicle
Service.
WHEEL AND TYRE -
Troubleshooting
31-4
WHEEL BALANCE ACCURACY
PURPOSE
This section contains tips and procedures for
achieving accurate wheel balance. Steering wheel
vibration and /or body shake can result if any of
these procedures 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
instruction manual should include calibration
procedures.
If
the
calibration
procedures
specifically for your balancer are missing, use the
generic steps in this section for zero calibration,
static balance, and dynamic balance checks. The
wheel balancer calibration checks are also
described in the flowchart. (Refer to P.31-5.)
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.
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.
Hub/shaft assembly
Spring plate
Clamping cup
Wheel mounting
cone
Standard passenger
car wheel
Wing nut
Confirming Proper Balance
1. After balancing the wheel, loosen the wing nut
and turn the wheel 180° against the balancer’s
hub. Then retighten the wing nut and check
the balance again. Repeat wheel balance if
necessary.
2. Turn the wheel again 180° 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°), and retighten the nut.
Recheck the balance.
WHEEL AND TYRE -
Troubleshooting
31-5
D
If the imbalance is 5 g or less, the zero
calibration is OK. Rebalance the wheel, then
go to Step 4 to check static balance.
D
If the imbalance is more than 5 g, go to Step
3.
3. Loosen the balancer wing nut, rotate the wheel
1/4 turn (90°), and retighten the nut. Recheck
the wheel balance.
D
If the imbalance is 5 g 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
manufacturer’s instructions to verify the correct
attachments. after making the necessary
corrections, recheck the wheel balance. If OK,
then go to Step 4.
D
If the imbalance is more than 5 g, the balancer
requires calibration. Contact the balancer
manufacturer for calibration by their repair
representative.
4. <<Static Balance Check>>
Attach a 5-g weight to the outer rim. Recheck
the balancer. The balancer should detect 5 ± 2
g of imbalance 170° to 190° away from both the
inner and outer 5-g weights.
D
If the imbalance is within specification, the static
balance calibration is correct. Go to Step 5
to check the dynamic balance.
D
If the imbalance is out of specification, the
balancer requires calibration. Contact the
balancer manufacturer for calibration by their
repair representative.
5. <<Dynamic Balance Check>>
Attach a 5-g weight to the inner rim at 180°
opposite the 5-g weight that was added in step
4. Recheck the balance. The balancer should
detect 5 ± 2g of imbalance 170° to 190° away
from both the inner and outer 5-g weights.
D
If the imbalance is within specification, the
dynamic balance calibration is correct. The
balancer calibration checks are complete.
D
If the imbalance is out of specification, the
balancer requires calibration. Contact the
balancer manufacturer for calibration by their
repair representative.
WHEEL BALANCER CALIBRATION CHECKING FLOW CHART
(Dynamic Balance Check)
(Static balance Check)
Balance wheel.
Rotate wheel 1/2 turn.
Imbalance = more than 5 g
Imbalance = 5 g or less
Rotate wheel 1/4 turn.
Imbalance = more than 5 g
Imbalance = 5 g or less
Verify wheel is properly centered.
Verify cones, cup, & wing nut are clean,
undamaged, & appropriate for wheel.
Make necessary corrections, then
recheck wheel balance.
Attach a 5 g weight to the outer rim.
Is the imbalance 5 ± 2 at 170°-190°
away from the 5-g weight?
NO
Balancer requires calibration.
Contact balancer manufacturer.
Balancer requires calibration.
Contact balancer manufacturer.
YES
Attach a 5-g weight to the inner rim at
180° opposite the weight on the outer
rim. Is theimbalance5±2gat170°-190°
away from both 5-g weights?
NO
Balancer requires calibration.
Contact balancer manufacturer.
Rebalance wheel.
YES
Balancer dose not require calibration.
WHEEL AND TYRE -
On-vehicle Service/Wheel and Tyre
31-6
ON-VEHICLE SERVICE
TYRE INFLATION PRESSURE CHECK
NOTE
For information on tyre inflation pressure, refer to the label
attached near the driver’s side door striker.
TYRE WEAR CHECK
Measure the tread depth of tyres.
Limit: 1.6 mm
If the remaining tread depth is less than the limit, replace
the tyre.
NOTE
When the tread depth of tyres is reduced to 1.6 mm or less,
wear indicators will appear.
WHEEL RUNOUT CHECK
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:
Item
Steel wheel
Aluminium wheel
Radial runout mm
1.2
1.0
Lateral runout mm
1.2
1.0
If wheel runout exceeds the limit, replace the wheel.
WHEEL AND TYRE
Caution
If the vehicle is equipped with the Brembo disc brake,
during maintenance, take care not to contact the parts
or tools to the caliper because the paint of caliper will
be scratched.
INSTALLATION SERVICE POINT
Tighten the wheel nut to the specified torque.
Tightening torque: 98 ± 10 N·m
Radial
Lateral
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