GMC chervolet camaro 1999 Service Manual page 59

0-56 Vibration Diagnosis and Correction
Measuring Propeller Shaft Runout
Tools Required
• J 8001
Dial Indicator Set
• J 7872
Magnetic Base Dial Indicator Set
1
6
Legend
(1) Slip Yoke
(2) Tube
4
(3) Rear Runout Check
(4) Center Runout Check
(5) Front Runout Check
(6) Damper
2
3
1 . Raise the vehicle on a suitable hoist. Refer to
Lifting and Jacking the Vehicle in General
Information.
2. Allow the wheels to spin freely.
182256
General Information
182270
3. Attach a
J 8001
and a
J 7872.
4.
Place the transmission in NEUTRAL.
5 ..
Rotate the pinion flange or the transmission yoke
by hand while taking the measurements for the
runout.
Important: The propeller shaft turns easier in one
direction than in the other. Removing the wheels will
also help. Do not include fluctuations on the dial
indicator due to welds or surface irregularities.
6. Perform the following steps for one-piece propeller
shafts if the runout exceeds the tolerances at one
or more points:
6.1. Rotate the propeller shaft 180 degrees in
the pinion flange ..
6.2.
Reinstall the propeller shaft.
6.3. Measure the· propeller shaft runout.
6.4. If the runout still exceeds the tolerance,
inspect the pinion flange runout before
replacing the propeller shaft.
7. Perform the following steps for two-piece propeller
shafts if the runout exceeds the tolerances at one
or more points:
Important: The runout of the rear splines on the front
propeller shaft affects the runout of the front
measurement on the rear propeller shaft.
7.1. Measure the rear propeller shaft.
7.2. Mark the position of the rear shaft in the
pinion flange.
7.3. Remove the rear shaft.
7.4. Measure the front propeller shaft runout on
the tube and the stub shaft.
7.5. Replace the propeller shaft if either
measurement is out of tolerance. Refer
to Propeller Shaft Runout Specifications.
(
Important: When you replace a propeller shaft,
inspect the new shaft for runout. Inspect the pinion
flange runout if the replacement shaft runout is also out (
of tolerance.