Buick LeSabre 1965 Service Manual page 413

PROPELLER SHAFT, 45, 46
f
4 8 , & 4 9 0 0 0 SERIES
6-47
6 - 2 3 PROPELLER SHAFT TROUBLE DIAGNOSIS (Cont'd)
COMPLAINT
Roughness or vibration, any
speed.
POSSIBLE CAUSE
Cut center bearing support
rubber.
Improper yoke phasing.
Bent shaft.
Dented shaft.
Improperly aligned support.
Tight universal joints.
Worn universal joints.
U-joint retainer bent against
bearing cup.
Undercoating on shaft.
Incorrect U-bolt torque.
Burrs or gouges on compan-
ion flange snap ring location
surfaces.
Incorrect rear joint angle
(usually too large an angle).
Tire unbalance.
#
Shaft or companion flange un-
balance combination.
REMEDY
Replace.
Correct as above.
Replace.
Replace - On 49000 check to
s e e if sufficient clearance
exists between rear frame tun-
nel and propeller shaft if car
is raised on a frame hoist.
Grind out frame for sufficient
clearance if necessary.
Align or check for proper in-
stallation of mountings.
Impact yokes with hammer to
free up. Replace joint if unable
to free up or if joint feels
rough when rotated by hand.
Replace.
Replace.
Clean up shaft.
Check and correct - (15-18
ft. lbs.)
Attempt to clean up flange.
Replace companion flange if
necessary.
Check and adjust using Kent-
Moore alignment gauge.
Balance wheel and tire as-
sembly or replace from known
good car.
1. Check for missing balance
weights.
2. Remove and reassemble
shaft to companion flange 180°
from initial location.
3. Remove and replace com-
panion flange at rear axle pin-
ion 180° from initial location.
4. Rebalance.