GMC Chevrolet Camaro 1998 Service Manual page 86

0-74 Vibration Diagnosis and Correction
182274
182281
General Information
Helpful Hints
• If necessary, add compensation weights on the
face of the pinion flange dust slinger. These
weights are tack-welded onto the slinger. You may (
remove the weights with a die-grinder.
• Carefully remove the spot weld at either end of
the weight.
• Do not remove the weight unless you have
inspected the pinion flange runout and the
procedure calls for weight removal.
• Do not remove any weights on the outboard edge
of the dust slinger. These weights are present in
order to internal axle components. The weights
are not related to the pinion flange runout.
Correcting Vibration at the Pinion Nose
Most first-order driveline vibrations originate at the
pinion nose end of the driveshaft. Ensure that
the vibrations are at a minimum at this location in
order to achieve acceptable results. Reduce the runout
of the components to a minimum. Balance the
driveline as a system when necessary.
1. Measure the runout of the propeller shaft and
check the tolerance.
2. If the tolerance is excessive, mark the position of
the shaft for future reference and rotate the shaft
180 degrees.
3. Reinstall the shaft and recheck the runout. Inspect
the level of vibration in order to determine if the
vibration is lower or corrected.
4. If the runout is still excessive, or if the vibration is
still present, refer to Measuring Pinion Flange
Runout. Replace the pinion flange or re-index the
flange 180 degrees if the pinion flange runout
exceeds the tolerance.
Remove and reinstall the pinion flange only once
on axles utilizing a "crush" type sleeve. Replace
the sleeve with a new sleeve if the sleeve is
"crushed". Removing the sleeve requires removal
of the ring and pinion set. Therefore, replace
flanges with excessive runout. Regardless of the
method used, measure the pinion flange runout
in order to ensure that the flange is within
tolerance.
5. Recheck the propeller shaft runout if the vibration
is present after the pinion flange runout is
corrected. If the propeller shaft runout is still
excessive, correct the runout before doing
a driveline system balance. Either replace the
shaft with a shaft that is within tolerance or sublet
the shaft to a reputable independent for (
straightening and re-balance. Ensure that the new .
or rebuilt shaft is within runout tolerance before
you continue.