GMC chevrolet camaro 2000 Service Manual page 83

0-72 Vibration Diagnosis and Correction
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95623
95624
TYPE MC
TYPEP
218175
General Information
Tire Balancing Guidelines
Static and dynamic balance are two kinds of tire/wheel (
balancing:
1. Static balance, also called single plane balance,
affects the distribution of weights around the
wheel circumference.
2. Dynamic balance, or two-place balance, affects
the distribution of weight on each side of the
tire/wheel centerline.
3. Most off-vehicle balancers can check both types
of balance simultaneously.
4. As a general rule, most balancers are most
sensitive to static imbalance that to dynamic
imbalance. As little .as 0.50 - 0.75 oz may induce
a vibration in some vehicles. Vibration
induced by static imbalance will cause a vertical,
or bouncing motion of the tire. Dynamic
imbalance results in a side-to-side motion of the
tire, or shimmy.
5. Balance all four tires/wheels as close to ZERO as
possible.
6. Carefully follow the wheel balancer manufacturers
instructions for proper mounting techniques for
different types of wheels.
7. Aftermarket wheels, especially tho.se incorporating
universal lug patterns, are potential sources of
runout and mounting problems.
8. Use the correct coated weights on· aluminum·
wheels.
9. Retest the tire and wheel for excessive runout
after correction and installation.
10. Evaluate the vehicle at the complaint speed and
note if the vibration has been corrected.
11. If the vibration is still present, or is reduced but
still unacceptable, consider thes.e possibilities:
• On-vehicle imbalance
• Radial or lateral force variation
Wheel Weight Usage (Aluminum Wheels)
1. Locate the wheel weights on the inboard rim
flange. If during static balancing more than
28 grams (1 ounce) is needed, split the weights
as equally as possible between the inboard ..
and outboard flanges.
2. Use special polyester-coated clip-on wheel
weights in order to balance factory aluminum
wheels. These weights are designated MC or P,
and must be used on aluminum wheels
having
a
wide 7.6 mm (19/64 in) flange. Use a
plastic tipped hammer in order to prevent
damage to the weight's coating during
installation.
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