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by rotating a driveshaft that has
some degree of runout,
180°
on the
companion flange.
DRIVESHAFT BALANCING
PROCEDURE:
1. Place the car on a twin post
hoist so that the rest of the car is
supported on the rear axle housing
with wheels free to rotate.
2. A car is normally more sensi-
tive to excessive unbalance at the rear
so that checking should begin at the
rearward end of propeller
shaft.
Therefore, locate the heavy side of
the driveshaft by holding crayon or
coloured pencil close to rearward end
of shaft while shaft is rotating
(speedometer.
indicating 40-50 mph).
See Fig. 9. Carefully bring crayon up
FIG. 9 - Driveshaft Balancing
Procedure
PART
5-1-DRIVE LINE
until it just contacts rotating shaft. If
carefully done, only the heavy side
(point of maximum runout) will be
marked by crayon. This normally
gives a good indication of which side
of the shaft is heavy for unbalance
and indicates a starting point for
initial location of clamps.
3.
Install two Jubilee Type hose
clamps on the propeller shaft, as
shown in Fig.lO.Position each clamp
with heads
180°
from crayon mark-
ing. Tighten clan1ps.
4. Run the car through the speed
range to 65-70 mph. If no unbalance
is felt, nothing further need be done
on the hoist. However, if unbalance
still exists, the combined weight of
the two hose clamp heads may be
FIG. 1 0-lnstallation-
WhiHek Type Hose Clamps
5-7
excessive, so to reduce this excess,
rotate the clamp heads away from
each other approximately 45
°
(one
each way from the original position).
See
Fig.
11.
Run car and note if
unbalance has improved.
5.
Continue to rotate the clamps
apart in smaller angular increments
until the car feel for unbalance is best.
6.
Road test the car again for
final check of balance.
NOTE: Slight vibration felt in the
car on the hoist may not show up
i.ti
a road test which is after all the final
determining factor.
CAUTION: Do not run car on
hoist for extended periods due to
danger of overheating of transmission
or engine.
FIG. 11 -
Positioning Jubilee
Type Hose Clamps on the
Propeller Shaft
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