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13A
REAR AXLE—Service Information
3.
I n s t a l l a t i o n of P i n i o n Shaft O i l R e t a i n e r
L a t e " C " series cars have a n o i l retainer o n the p i n i o n shaft
between the torque tube a n d the differential carrier t o prevent
the rear a x l e l u b r i c a n t f r c m l e a k i n g i n t o the t o r q u e t u b e a n d
e v e n t u a l l y i n t o the t r a n s m i s s i o n i n localities where steep
grades are c o m m o n .
T h e retainer assembly consists of a
d o u b l e p l a t e spot welded at t w o p o i n t s c o n t a i n i n g a felt
washer, a n d a bearing retaining n u t w i t h a s p i r a l o i l r e t u r n
groove c u t i n the outer surface.
C a r s h a v i n g this o i l retainer
c a n be identified b y a n inspection of the rear axle as the re-
t a i n e r i f u s e d w i l l be p l a i n l y visible between the torque t u b e
a n d the front end of the differential carrier.
T h i s retainer assembly, P a r t N o . 1081881, a n d b e a r i n g re-
t a i n i n g nut, P a r t N o . 891890, m a y be installed o n early " C "
series a n d " B " series cars.
T o install the retainer first re-
m o v e the rear a x l e a s s e m b l y from the car, a n d t h e n remove
the torque tube a n d p r o p e l l o r shaft from the axle a s s e m b l y .
R e m o v e b o t h b e a r i n g retaining nuts, l o c k i n g washer
a n d
thrower washer from the front e n d o f the p i n i o n shaft.
D i s -
c a r d the wide retaining n u t a n d o i l thrower washer, b u t save
the narrow l o c k i n g nut a n d the l o c k i n g washer.
P l a c e a few drops o f o i l o n the felt washer a n d install the
retainer w i t h the well c o n t a i n i n g the felt e x t e n d i n g t o w a r d
the front of the c a r as s h o w n P l a t e 3 - A .
N e x t , install the
bearing retaining n u t o n the p i n i o n shaft w i t h the hexagonal
shoulder t o w a r d the front of the car, t h e n install the
l o c k i n g
washer a n d l o c k i n g n u t o n the front e n d o f the p i n i o n shaft.
T h e p r o p e l l o r shaft a n d torque t u b e m a y t h e n b e assembled
a n d the axle installed in the car.
Replacement and Adjustment of Rear Axle Ring Gear and Drive Pinion
In o r d e r to assure quiet operation a n d l o n g life o f C a d i l l a c
a n d L a S a l l e rear axles, it has been the practice o f the C a d i l l a c
M o t o r C a r C o . t o handle all replacement a n d adjustment o p e r a -
tions o n the r i n g gear a n d d r i v e p i n i o n o n a n exchange basis.
T h i s was d o n e to insure s u c h accuracy as c o u l d be m a i n t a i n e d
o n l y b y careful m a t c h i n g of. p a r t s from a sufficiently large
s t o c k . I m p r o v e m e n t s i n materials a n d i n gear c u t t i n g methods
have, however, made it possible to produce rear axle gears t h a t
can be satisfactorily serviced in the
field.
A c c o r d i n g l y the
F a c t o r y P a r t s D i v i s i o n are now s u p p l y i n g r i n g gears a n d
p i n i o n s i n m a t c h e d sets for service o n V - 8 a n d V - 1 2 b o t h " B "
a n d " C " series cars.
W h i l e the practice of replacing the differential carrier
assembly has been d i s c o n t i n u e d o n these car models i t is s t i l l
i n effect o n the V - 1 6 .
I n case the rear axle gears need re-
p l a c i n g o r adjusting o n V - 1 6 cars, the entire differential
carrier assembly s h o u l d be replaced a n d the o l d one returned
to the factory o n the regular exchange basis as i n the past.
W h e n the r i n g gear a n d d r i v e p i n i o n are replaced o n the V - 8
a n d V - 1 2 cars, the double-row b a l l b e a r i n g o n the front end
of the d r i v e p i n i o n shaft s h o u l d also be replaced.
E x p e r i e n c e
has p r o v e d t h a t trouble m a y develop from wear o n this bear-
ing, whenever the gears are w o r n sufficiently to require re-
p l a c e m e n t , i f the b e a r i n g is n o t replaced at the same t i m e the
gear replacement is made.
It is also advisable t o replace the cork gasket o n the retainer
for the front p i n i o n b e a r i n g a n d , i n cars w h i c h have the late
t y p e axle o i l retainer, the felt washer s h o u l d be replaced.
I n
this c o n n e c t i o n , whenever the axle is d o w n for inspection o r
replacement of gears, the retainer nut s h o u l d be inspected a n d
the g r o o v e d t y p e installed whenever the p l a i n t y p e is found.
C o m p l e t e instructions for replacing a n d adjusting the rear
axle gears o n V - 8 a n d V - 1 2 cars are g i v e n b e l o w :
R e m o v a l a n d Disassembly
The replacement of the rear axle ring gear a n d d r i v e p i n i o n
necessarily
requires
the
removal a n d
disassembly o f
the
differential gear assembly.
1 o remove this u n i t , it is necessary
first to remove the rear axle assembly from under the car.
T h e n the axle shafts, the torque tube, the propeller shaft, the
differential cover a n d reinforcement plate are removed, after
w h i c h the differential gear assembly is d i s m o u n t e d o r taken
off of the differential carrier.
See b i g . 1, P l a t e 5 A .
T h e differential gear assembly is disassembled i n the follow-
i n g order:
1. R e m o v e caps for differential side bearings a n d t a k e o u t
adjuster rings.
2. R e m o v e differential u n i t .
3. R e m o v e r i n g gear from differential case a n d gear m o u n t .
4. R e m o v e d r i v e p i n i o n , bearings, front bearing retainer
a n d b e a r i n g spacer.
N O T E — D o n o t lose o r damage the shims between the front
b e a r i n g retainer a n d the front end of the differ-
e n t i a l carrier.
5. W a s h p a r t s in gasoline o r kerosine a n d d r y w i t h a i r
after w h i c h check a l l p a r t s carefully.
T h e differential p i n i o n s a n d side gears m a y be r e m o v e d
s i m p l y b y r e m o v i n g the retaining screw in the pinion shaft
a n d d r i v i n g o u t this shaft.
It is not necessary t o remove these
gears, however, for r e p l a c i n g the r i n g gear a n d d r i v e p i n i o n .
E x a m i n e the bearings, the b e a r i n g m o u n t s , a n d the differ
e n t i a l gears.
T h e y s h o u l d be s m o o t h , free from p i t s a n d the
gears a n d bearings s h o u l d n o t b e c h i p p e d o r b r o k e n .
T h e flange o f the differential case s h o u l d also b e c h e c k e d for
wobble a n d e c c e n t r i c i t y : i t s h o u l d r u n true laterally a n d
r a d i a l l y w i t h i n .001 i n . o r .004 i n . w h e n tested o n the b a c k of
the r i n g gear.
A convenient w a y of m a k i n g this test is t o i n -
s t a l l the differential case a n d bearings i n position i n the carrier
a n d check the flange w i t h a d i a l i n d i c a t o r c l a m p e d to the
carrier o r bearing cap studs u s i n g holder H M 9 1 2 2 0 .
T h e hubs of the differential side gears s h o u l d have no more
t h a n .005 i n . r a d i a l clearance i n the differential case.
E n d -
p l a y i n these gears s h o u l d not exceed .020 i n .
T h e t w o differential p i n i o n gears should h a v e a clearance of
not more t h a n .010 i n . o n the p i n i o n shaft a n d n o t more t h a n
.020 in b a c k l a s h w i t h the side gears.
R e a s s e m b l y a n d I n s t a l l a t i o n
Reassembly of the differential gear assembly is a c c o m p l i s h e d
i n the following o r d e r :
1. Install ball bearings, bearing spacer, front bearing re-
tainer a n d bearing retaining nuts o n d r i v e p i n i o n shaft, being
sure to get the retainer back of the front bearing a n d w i t h this
b e a r i n g fitted i n the c u p of the retainer.
August 1933
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