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5-16
REPAIRS
REAR AXLE ASSEMBLY
(
186)
pimo n
in vise, tighten nut to a minimum of
150 ft. lbs. torque; nut must hold b ia r ing tight
against shoulder on
pinion.
Do not grip pinion
teeth in vise even though soft jaw liners are
used. Stake thin edge of nut down into notch
in pinion.
3. Coat
splines
of pinion and propeller shaft
with white lea d,
then
press pinion into pro-
peller
shaft
until coupling pin holes are
aligned,
using Press J 1292-B. See figure 5-7. Pinion
m
ust
not
be
a
loose fit in propeller
shaft.
Install
a new coupling pin and solidly
rivet
both
ends.
I
IMPORTANT:
When ever
a pinion and pro-
peller
shaft are
assembled
tog
ether
the com-
plete assembly
must
be
checked
for straightness
regardless of
whether new
or
orig inal parts
ar
e
assembled.
S
ee
para
graphs
5-1 6
and
5-1 7
below.
it to within .015" runout. Recheck for run-out
after each springing operation.
5-17 STRAIGHTENING PINION AND
PR~PELLER
SHAFT ASSEMBLY,
USING V-BLOCKS
If
the fixture shown in figu
re
5-19 is not
available, the pinion and propeller shaft may
be checked and straightened using V-blocks or
rollers and a dial indicator.
1. Support the assembly on V-blocks placed
under
the machined
section just to rear of
splines at "A" and under the rear (roller)
bearing at
"
B" . See figu
re
5-21.
2. Mount a dial indicator so that
readings
for run-out can be taken successively at points
"C"
located
3" from ea ch end of shaft tube,
Figu
re
S-19-Straightening Propeller Shaft in Fixture
5-16
STRAI GHTENING
PINION AND
PROP ELLER
SHAFT
ASSEMBLY,
USIN G FIXTURE
The
pinion
and propeller shaft
assembly may
be quickly
and
sat isfactorily checked and
straightened by means of the fixt ure shown in
figure
5-19.
This
fixture
sh
ould be made locally,
using any 1940 through 1949
model
Buick dif-
f
erential
carrier, as shown in
figure
5-20.
1. Mount the pinion and
propeller
shaft
assembly in the fixture, being
sure
to
tighten
pinion
bearing lock
screws
evenly
and
securely
to press
pinion f
r ont bearing solidly against
shoulder.
2. Mount a dia l indicat or on a rod fastened
to a block of
sufficient
weight to hold
the
indi-
cator
button firmly
agai nst
t
he ground
portion
of
the propeller
shaft,
j
ust
to the rear
of
t
he
splines a
s shown in figure
5-19.
3. Turn
the
sh
aft by hand from t
he
pinion
end
a
nd note
the
amount of
r
unout as shown
by
the in
dicator.
The t
otal
indicator reading
should not exceed
.015"
.
4. If
the
reading exceeds
.015",
turn shaft
t
o
high point on indicator and force end of
shaft downward by hand sufficiently to spring
point
"
E " at m
iddle
of shaft tube, point "
G"
at front (ball )
bearing,
and
Point "
H " at front
end of
splines.
Whe n checking points "C
"
and
"E",
ca r e must be taken not to permit the
seam or hollow spots on tube to give a
"bounce"
to indicator and thus show a wrong
indicator
r
eading.
3.
Check run-out at
points
"C" first. If t
otal
indicator
reading is .005"
or
les
s, the
shaft is
OK at
these points.
If
run-out
exceeds
.005",
support the shaft at "A" and "D" (under lock
sleeve)
and exer t pressure against high
side
of
shaft at point "F" located on end of shaft tube
where
run-out
exists.
Use
steady pressure
and
not shock blows to spring
shaf t as
requir ed to
bring
run-out
at points
"C"
within .002".
4. Check
run-out at
point
"
E" after correct-
ing any
run-out
at
point s
"
C" . If run-out at
"
E"
exceeds
.010" t
ot al
indicator
r
eading,
sup-
port the sh
aft at
points "
F"
and exe
rt
steady
pressure against
high
side
of sh
aft a
s
required
t
o bring
r
un-out
w
it hin .010" .
5.
Check run-out at point "G
"
after correct-
ing
run-out
at points "C" and "E". If run-
out at
"
G"
exceeds
.001" total indicator read-
ing,
support
the
shaft at
points
"A" and "D"
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