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4A-8
1977 PONTIAC SERVICE MANUAL
Fig.
4A-10
Reference Marks on Drive Shaft
5. Install two screw-type hose clamps on the drive shaft
as close to the rear as possible. Position both clamp heads 180
degrees from the heaviest point of drive shaft as indicated by
strobe light. Tighten clamps (Fig. 4A-12).
CAUTION: Be sure suficient clearance is
maintained so that clamp heads do not contact
floor pan o f car when axle is in contact with
rebound bumper in frame. In
.
order to gain
suficient clearance, it may be necessary to position
the clamps over the balance weights.
6. Run car through the speed range 50-55 mph. If
disturbance is gone, nothing further need be done on the
hoist. If the disturbance is not gone and the strobe light shows
the two clamp heads at the top of the shaft, add one more
hose clamp and recheck. If the strobe light still shows the two
clamp heads at the top of the shaft, remove the shaft and
remtall it 180 degrees on the rear flange. Recheck balance
with no clamps. Repeat balance starting with Step 5. If the
shaft still needs more than three hose clamps at the same
clock position, replace the shaft. However, if the clamps are
also 180 degrees from the original position after the shaft was
rotated 180 degrees, the drive flange on the axle is out of
balance and must be replaced. D O NOT use more than three
hose clamps to balance the shaft. If the strobe light shows the
hose clamps at the bottom of the shaft, but the disturbance
still exists, go to Step 7.
7. Rotate two of the hose clamps equally away from each
other toward the top (one each way from the original position
as shown in Fig. 4A-13), in small increments until best
balance is achieved.
In some cases, it may be necessary to use one clamp or
possibly three clamps in order to obtain a good balance.
NOTE:
/
MAKE UP
EXTENSION
FOR BALANCER
PICK-UP BY
USING 318"
TUBE AND
COMPRESSION
FITTINGS.
DROP TWIN POST HOIST JUST ENOUGH TO ALLOW
THE VEE OF THE HOIST TO CLEAR THE AXLE
THUS PLACING THE WEIGHT OF THE CAR ON THE
STANDS. THE SYSTEM WILL THEN BE RELEASED
AND FREE TO RESPOND TO PROPELLER.
4836
Fig.
4A-1 1
Pick-Up Unit at Differential Pinion Nose
Fig.
4A-12
Balance Hose Clamps in Place
Replace shaft if three hose clamps do not correct
problem.
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