GMC Chevrolet Camaro 1998 Service Manual page 76

0-64 Vibration Diagnosis and Correction
7. Measure the tire and wheel assembly lateral
runout.
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Lateral runout should be measured on a smooth
area of the sidewall as close to the tread as
possible. Ignore any jumps or dips due to sidewall
splices and attain an average amount of runout.
7.1. Slowly rotate the tire and wheel assembly
one complete revolution and ZERO the dial
indicator on the low spot.
7.2. Rotate the assembly one more complete
revolution and note the total amount of
runout indicated.
Maximum Lateral Runout
• Measured off-vehicle: 1.27 mm (0.050 in)
• Measured on-vehicle: 1.52 mm (0.060 in)
8. Make the necessary repairs to the tire and wheel
assembly.
9. Install the tire and wheel assembly to the vehicle.
Refer to Wheel Removal
10. Repeat the procedure until all the wheel runouts
have been measured.
11. Lower the vehicle.
Measuring Wheel Runout
If tire and wheel assembly runout cannot be brought
within tolerance, measure the wheel runout.
If any runout measurement of a wheel exceeds
specifications, the wheel should be replaced.
(ALWAYS measure the runout of a new wheel.)
General Information
If the runout of the wheel is within tolerance, and the
tire and wheel assembly runout cannot be reduced
to an acceptable level, the tire should be replaced.
(ALWAYS measure the tire and wheel assembly runout (
after replacing the tire.)
Measurement Procedure
1 . Raise and suitably support the vehicle. Refer to
Lifting and Jacking the Vehicle
2. Matchmark the each of the tire and wheel
assemblies in relation to the wheel studs and to
their position on the vehicle (LF, LR, RF, RR)
for future reference.
3. Remove the tire and wheel assemblies one at a
time and mount on a spin-type wheel balancer.
Refer to Wheel Removal
Locate the tire and wheel assembly on the
balancer with a cone through the back side of the
center pilot hole.
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4. Measure the wheel radial runout on the outside of
the wheel (with the tire mounted), if the wheel
disign allows.
Wheel runout should be measured on both the
inboard and outboard rim flanges. Ignore any
jumps or dips due to paint drips, chips, or welds.
4.1. Slowly rotate the tire and wheel assembly
one complete revolution and ZERO the dial
indicator on the low spot.
4.2. Rotate the assembly one more complete
revolution and note the total amount of
runout indicated.
Aluminum Wheel Maximum Radial
Runout
0.762 mm (0.030 in)
(