GMC Chevrolet Camaro 1998 Service Manual page 91

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General Information
3. Determine which end of the propeller shaft has
the most vibration in order to identify where to
begin installing the hose clamps.
4. Mark the end of the propeller shaft (1) which has
the most vibration at four points, 90 degrees
apart. Number the marks 1 through 4 (2).
Troubleshooting Hints
The following procedure uses a trial and error method
of determining where to place the hose clamps on
the shaft. Use the following tips in order to help locate
the clamps:
1. Because the imbalance may be related to
propeller shaft runout, begin installing the clamps
at the low point of the propeller shaft runout.
2. When the plant workers balance the. propeller
shaft, they use weights in graduated increments:
1/16 oz, 1/8 oz, etc. If the stock weight is too light
or too heavy, place the hose clamp either
directly in line. with or opposite to the stock weight.
The last method involves road testing the vehicle at a
speed which the vibration is felt.
1. Carefully hold a piece of chalk up to the very end
of the propeller shaft. Barely touch the chalk to
the shaft.
2. Shut the engine off in order to stop the propeller
shaft from rotating. Do not step on the brake
pedal. Do not put the transmission in Park.
3. Inspect the chalk mark.
If you performed the above procedure correctly, the
chalk mark will indicate the heavy spot on the
shaft. The heavy spot deflected downward and
touched the chalk. If the chalk mark circle the entire
shaft, touch the chalk more gently to the shaft. Ensure
that the chalk touches only the heavy spot. Once
the heavy spot is located, place the hose
clamp 180 degrees opposite to the chalk mark. Then
perform the following steps:
1 . Place the hose clamp at the light spot, or at any
of the four points marked previously.
2. Test drive the vehicle at the speed at which the
vibration occurred. Record any changes in the
vibration.
3. Move the clamp to the other positions.
4. Test drive the vehicle each time the clamp is
moved. Record any changes in vibration. Note
which position gives the best balance.
Vibration Diagnosis and Correction 0-79
Q-
1
0.0 1.0 2.0
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