GMC chevrolet camaro 2000 Service Manual page 70

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Ge.nE!ral. Information
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19. Strobe the propeller shaft again.
• The propeller shaft is balanced ifthe strobe
. image is erratic and the amplitude is
near two.
• ThE! · propeller shaft is not balanced if one of
the following conditions exist:
- The weight and the original light spot are at
the six o'clock position (1). ·
The above condition means that there is
not enough weight on the propeller
shaft. In order to correct the balance,
add a second weight next to the
fir$t weight. Inspect the balance again
using the strobe light.
If the weights are now 90-180 degrees
off (between the nine o'clock and
the three o'clock positions) too much
weight exists. In order to correct
the balance, split the two weights equally
on either side of the original light
spot (1) in order to produce a total
weight between 1-2 weights (between
0-120 degrees apart). Inspect the
balance again using the strobe light.
Adjust the weights as needed.
- The weight and original light spot are
90-180 degrees off (between the
nine o'clock and the three o'clock positions).
The above condition means that
one weight is too much. In order to
correct the balance, split the two weights
equally on either side of the original
light spot in order to produce a
total weight less than one
(120-180 degrees apart). Inspect the
balance again using the strobe
light. Adjust the weights as needed.
Vibration Diagnosls and Correction
o~sg
- The weight and the original light spot are
within 180 degrees of the six o'clock . .
position.
Move the weight towards the six o'clock
position. Inspect the·balance again
using the strobe light. Adjust the weight
as necessary. Refer to the previous
two conditions.
If the shaft will not balance using two weights, place a
third weight on the light spot. Split the first two weights
in order to produce a total weight between two and
three weights.
If three weights fail to balance the driveline; replace
the propeller shaft.
When the propeller shaft balances, road test the
vehicle in order to verify that the vibration is eliminated.
Propeller Shaft Balance Weights
When using clamps in order to balance a propeller
shaft with the total weight method, the correction
weight required will often be a fraction or a multiple of
one hose clamp. Use the following phasing procedure
with two hose clamps in order to accurately place
any required amount (0.0-2.0 total weights).
1
0.0
1.0
2.0
1. Ensure that the clamps are located with even
spaces on either side of the light spot, or
; 80 degrees opposite the heavy spot (i ).
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The table containing the weight amounts in terms
of the total weight and the included angle
(spread) between the clamps is in specifications.
Refer to Propeller Shaft Balancing Weight
Amounts.
2. If the vibration does not change at all or gets
worse, then one clamp is too light or too heavy.
Repeat the procedure using the two clamps
together.
3. If the previous step did not correct the problem,
repeat the procedure using the two clamps
separated in order to reduce the spinning weight.