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 tyres must be properly mounted on a
balancer in order to achieve correct
balance. Centring 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 tyres, 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 centre hole on the hub side has a chamfered
edge. Use a back-mounting cone on your wheel balancer to centre 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.
![](../../../img/31/AC305700AB00ENG.png)
<CONFIRMING PROPER
BALANCE>
1.After balancing the wheel, loosen
the wing nut and turn the wheel 180°
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°
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°), and retighten
the nut. Recheck the balance.
- 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.
- 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.
- If the imbalance is 5 g or less, the wheel may not be centred 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, 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 the 5 g 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 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
±
2 g of imbalance
170 to 190°
away from both the inner and outer 5 g weights.
- If the imbalance is within specification, the dynamic balance
calibration
is correct. The balancer calibration checks are
complete.
- 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
![](../../../img/31/AC502720AB00ENG.png)