Buick LeSabre 1965 Service Manual page 370

6-4
REAR AXLE
PINION NUT
PINION FLANGE
WASHER
SLINGER
O-RING SEAL
SPACERS
HUB BOLT
AXLE SHAFT
RETAINER
(OUTER)
/n)
OIL SEAL
FRONT PINION
BEARING
REAR PINION
BEARING
DRIVE
PINION
FILLER PLUG
L - BEARING
CARRIER
PINION AXLE
WASHER
L ^ _
SUPPORT
BEARING
SIDE GEAR
PINION
WASHER
RING GEAR
OIL SEAL
I!
RETAINER
(INNER)
PEDESTAL
r A Q P
SIDE
CASE BEARING
SPRING PIN
originate elsewhere in the ve-
hicle. This is particularly true
with low tire pressure. Some de-
signs of non-skid treads may be
more noisy than others, even when
tires are new.
(3) Test for Tire Noise. Tire
noise changes with different road
surfaces, but rear axle noise does
not. Temporarily inflating a l l
tires to approximately 50 pounds
pressure, for test purposes only,
will materially alter noise caused
by tires, but will not affect noise
caused by rear axle. Rear axle
noise usually ceases when coast-
ing at speeds under 30 miles
per hour; however, tire noise
continues but with lower tone as
car speed is reduced. Rear axle
noise usually changes when com-
paring "pull" and "coast," but
tire noise r e m a i n s about the
same.
(4) Front Wheel Bearing Noise.
Loose or rough front wheel bear-
Fig. 6-2—Rear Axle Assembly
ings will cause noise which may
be confused with rear axle noises;
however, front wheel b e a r i n g
noise does not change when com-
paring "pull" and "coast." Light
application of brake while holding
car speed steady will often cause
wheel bearing noise to diminish
as this takes some weight off the
bearing. Front wheel bearings
BEARING
AXLE SHAFT
RETAINER
Fig. 6-3—Rear Axle Shaft Bearing
and Seal
may be easily checked for noise
by jacking up the wheels and spin-
ning them, also by shaking wheels
to determine if b e a r i n g s are
loose.
(5) Engine and T r a n s m i s s i o n
Noises. Sometimes a noise which
seems to originate in the rear
axle is actually caused by the
engine ur transmission. To de-
termine which unit is actually
causing the noise, observe ap-
proximate car speeds and condi-
tions under which the noise is
most pronounced; then stop car
in a quiet place to avoid inter-
fering noises. With transmission
in neutral, run engine slowly up
and down through engine speeds
corresponding to car speed at
which the noise was most pro-
nounced. If a similar noise is
produced with car standing, it is
caused by the engine or trans-
mission, and not the rear axle.