Mitsubishi Galant. Manual — part 487
31-1
GROUP 31
CONTENTS
WHEEL AND TIRE DIAGNOSIS . . . .
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . .
WHEEL BALANCE ACCURACY . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
TIRE INFLATION PRESSURE CHECK . . .
TIRE WEAR CHECK. . . . . . . . . . . . . . . . . .
WHEEL RUNOUT CHECK . . . . . . . . . . . . .
WHEEL AND TIRE . . . . . . . . . . . . . . .
INSTALLATION SERVICE POINT . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING SPECIFICATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL SPECIFICATIONS . . . . . . . . . .
SERVICE SPECIFICATIONS . . . . . . . . . . .
WHEEL AND TIRE DIAGNOSIS
TSB Revision
WHEEL AND TIRE
31-2
.
W H EEL A N D TIR E D IA G N O SIS
DIAGNOSIS
M1311000700073
SYMPTOM
PROBABLE CAUSE
REMEDY
REFERENCE
PAGE
Rapid wear
at shoulders
Under-inflation
or lack of
rotation
Adjust the tire
pressure.
Rapid wear
at center
Over-inflation
or lack of
rotation
Cracked
treads
Under-inflation
Adjust the tire
pressure.
ACX00923AB
ACX00924 AB
ACX00925AB
ACX00926AB
ACX00927AB
WHEEL AND TIRE DIAGNOSIS
TSB Revision
WHEEL AND TIRE
31-3
WHEEL BALANCE ACCURACY
M1311001700054
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
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.
Wear on one
side
Excessive
camber
Check the camber.
Refer to GROUP
33A,
On-vehicle service
−
Front wheel
alignment check
and adjustment
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,
check the front
suspension
alignment.
Refer to GROUP
33A,
On-vehicle service
−
Front wheel
alignment check
and adjustment
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
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.
•
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
manufacturer's instructions to verify the correct
attachments. 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
balancer 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
balancer requires calibration. Contact the
balancer manufacturer for calibration by their
repair representative.
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.
AC000041AB
HUB/SHAFT
ASSEMBLY
CLAMPING CUP
WING NUT
STANDARD PASSENGER
CAR WHEEL
WHEEL
MOUNTING
CONE
SPRING PLATE
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