GMC chervolet camaro 1999 Service Manual page 60

General Information Vibration Diagnosis and Correction 0-57
Diagnosing First-Order Driveline Vibration
Propeller Shaft Measurement Points
Props haft Front Runout Center Runout
Rear Runout
Stub Shaft Runout
One-Piece
Measure Measure
Measure
-
Aluminum Graphite
Measure
Two-Piece Front
Measure
Slip Yoke
Measuring Pinion Flange Runout
Tools Required
• J
8001 Dial Indicator Set
• J 23409 Dial Indicator Extension
• J 35819 Flange Ri.mout Gauge
1. Place the vehicle on a suitable hoist. Refer to
Lifting and Jacking the Vehicle in General
Information.
2. Allow the wheels to rotate freely.
3. Remove the propeller shaft from the pinion flange.
176029
4. Install the J 35819.
If a J 35819 is not available, measure the pinion
runout as close as possible to the pinion flange.
Important:
The dial indicator will have inverted
readings. You are measuring the inside diameter of
the flange; you are not measuring the outside
diameter. The highest reading on the dial indicator is
the low spot. The lowest reading is the high spot.
5. Rotate the pinion shaft 360 degrees and zero the
· dial indicator on the low spot.
6. Rotate the pinion flange again and record the total
run out.
7. If the pinion flange runout is 0.15 mm (0.006 in) or
less, remove the pinion flange balance weight.
8. If the pinion flange runout is greater than 0.15 mm
(0.006 in) but not less than 0.28 mm (0.011 in),
and the runout compensation weight is at or near
the low spot, no further action is necessary. If
the runout compensation weight is not at or near
the low spot, remove the weight.
-
-
Measure
-
-
Measure
9. If the pinion flange runout is greater than 0.28 mm
(0.011 in) but not greater than 0.38 mm (0.015 in),
and the balance weight is at or near the low point,
no further action is necessary. If the runout
compensation weight is not at or near the low spot,
remove the weight and re-index the pinion flange
until the runout is 0.25 mm (0.010 in) or less.
10. Replace the pinion flange/yolk when the runout
cannot be reduced to 0.25 mm (0.010 in) or less.
Then, recheck the runout. Service replacement
flanges do not have balance weights.
182274
• 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 requires weight removal.
• Do not remove any weights on the outboard edge
of the dust slinger. These weights are present in
order to balance internal axle components. The
weights are not related to the pinion flange runout.
• If a J 35819 is not available, inspect the propeller
shaft runout as near as possible to the flange.
Rotate the shaft 180 degrees in the pinion flange.
Reinstall the shaft. Inspect the measurement at the
same location.
A large difference in the runout, greater
than 0.38 mm (0.015 in), may indicate that the
flange is out of tolerance. If the runout does not
change at all, the flange is OK.