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PROPELLER SHAFT
4A-5
BEARING CUP
I N FLANGE YOKE
Fig. 4A-4 Measuring Angle At Companion Flange Yoke
Bearing Cup
g. Correct angles may be found in Fig. 4A-5.
Angle At Front Universal Joint
1. Place inclinometer on front propeller shaft bearing
cup (Fig. 4A-6). Center bubble in sight and record
measurement.
2. Rotate propeller shaft 90 degrees and place
inclinometer on front slip yoke bearing cup (Fig. 4A-7).
Center bubble on sight glass and record measurement.
3.
Subtract smaller figure from larger figure to obtain
existing front universal joint angle.
PROPELLER SHAFT BALANCING
PROCEDURE
HOSE CLAMP METHOD
1. Place the car on a twin post hoist so that the rear of
the car is supported on the rear axle housing and the rear
wheels are free to rotate. Remove both rear tire and wheel
assemblies and reinstall wheel lug nuts with flat side next to
drum.
2. Mark and number propeller shaft at four (4) points
90 degrees apart at rear of shaft just forward of balance
weight.
3. Install two (2) hose clamps on the rear of the propeller
shaft and slide them rearward until the clamps stop at the
nearest balance weight welded to the tube. Align both clamps
to any one of the four marks made on shaft in Step
2.
Tighten
the clamps (Fig. 4A-8). Be sure sufficient clearance is
maintained so that clamp heads do not contact floor pan of
car when axle is in contact with rebound bumper in frame.
In order to gain sufficient clearance, it may be necessary to
position the clamps over the balance weights.
4. Run the car through the speed range to 50-55 mph.
Note amount of unbalance.
CAUTION: Never run car higher than 55 pmh.
Also all personnel should stay clear o f drivelhe.
5. Loosen clamps and rotate clamp heads 90 degrees to
the next mark on shaft. Tighten clamps and repeat Step 4.
6. Repeat Step 5 until car has been run with clamp heads
located at all four marks on shaft.
7. Position clamps at point of minimum unbalance.
Rotate the clamp heads away from each other 45 degrees.
(One each way from the point of minimum unbalance). Run
the car and note if unbalance has improved (Fig. 4A-9).
In some cases it may be necessary to use one clamp or
possibly three clamps in order to obtain a good balance.
Replace shaft if three hose clamps do not improve the
imbalance.
8. Continue to rotate the clamps apart in smaller angular
increments until the car feel for unbalance is best.
D o not run car on hoist for extended periods due to
danger of overheating the transmission or engine.
9. Reinstall tire and wheel assemblies and road test the
car for final check of balance. Vibration felt in the car on the
hoist may not show up in a road test which is the final
determining factor.
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