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5-4
GROUP
5-DRIVE LINE AND CLUTCH
noticeable in the rear
seat
and over
the driveline, than in any other area
of the car.
Driveline vibrations
frequently
originate with excessive runout of
the driveline components, namely,
pinion companion flange, the pinion
itself, drive-shaft,
slip
yoke and
transmission output shaft. Runout in
these components will produce vib-
rations due to the fact that the com-
ponents will be rotating on a centre
other than the centre of balance.
Unbalance of one or more of the
driveline components will produce
vibration.
Driveline angles and the amount
of deflection across the universal
joints will also produce
similar
vibrations.
DIAGNOSIS PROCEDURES:
Road test for the presence of con-
ditions described previously.
Driveline and running gear vibra-
tions can be separated from engine
and sometimes transmission vibra-
tions by use of the following methods:
1.
Install a tachometer and note
the engine speeds at which the vibra-
tion occurs. Stop the vehicle and
operate the engine at the speeds
noted above. If the vibration is pre-
sent, the problem is in the engine or
transmission input component areas.
2. Operate the vehicle in high
gear in the speed range which pro-
duces the maximum vibration. If
practicable, shift the transmission
into intermediate gear and note if
there is a change in the vibration. If
the vibration is unchanged, usually
the engine and transmission can be
eliminated as the source of the prob-
lem. Repeat the above procedure but
shift the transmission to neutral and
shut off the engine. Again if the
vibration is unchanged, it can be
assumed that the engine and input
,members of the transmission are not
at fault.
3. Raise the car on a hoist or
place the car on jack stands and
operate the
vehicle
at the same road
speeds
that produce the vibration
noted in the road test. While opera-
ting at this
speed,
carefully adjust
engine R.P.M. so that the maximum
amplitude of the vibration can be
noted and felt. Holding the acceler-
ator pedal steady, disengage the
driveline by either moving the shift
lever to neutral or depressing the
clutch
and
observing whether or not
the
vibration
diminishes
in
direct
proportion to
speed
of the car as
PROPERLY SEA TED
CUP SI1AVES LUG
FIG. 4 - Universal Cup to Pinion Flange Fit
FIG. 5 - Checking Flange Bearing Cup Runout
indicated
on the speedometer. Quick-
ly engaging the driveline
should
re-
produce the vibration level of the
driveline which, when being operated
on jack stands, is about twice the
level as that actually experienced out
on the road.
CHECKING COMPANION FLANGE
To check
a
companion flange,
place the vehicle on a hoist of the
type
that
supports
the
axle
housing
and
proceed
as follows:
1.
With
the
driveshaft
removed,
check
the
companion
flange
for
damage to
the
universal
joint
bearing
location lugs
and
proper
bearing
seating.
Investigation of driveline
vibration complaints
has disclosed
that
some complaints are
the result
of
improper assembly
of the com-
panion flange
and
driveshaft. Accu-
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