Advertisement
PART
4-2-REAR AXLE OVERHAUL
4-15
EJ
Dl FFERENTIAL ASSEMBLy OVERHAUL
INTEGRAL CARRIER CONVENTIONAL
INSPECTION BEFORE
REMOVAL
The
differential
case assembly
&nd the drive pinion should be
in-
spected
before they
are
removed
from
the housing. These inspections
can help to find the cause of
the
trouble and to determine the cor-
rections needed.
Wipe the lubricant
from
the
in-
ternal
working parts, and
visually
inspect the parts for wear
or dam-
age.
Rotate
the gears to
see
if
there
is any roughness which
would in-
dicate defective
bearings or chipped
gears. Check the gear
teeth fc1·
scoring or signs of
abnormal wear.
FIG.
30-Ring Gear
Backlash Check
Check the differential case
and
the drive pinion for end play.
Set up dial indicator (Fig. 30)
and
check points around
drive gear.
Backlash
should be .005 to .007 inch
at tightest point.
If
no
obvious defect is
noted,
check the gear tooth contact.
Paint
the
gear teeth with suitable gear
marking
compound, such as
a paste
made
with dry red lead and a little
11i!. A mixture that is too wet
will
run
and
~mear.
Too
dry
a
mixture
cannot
be
pressed out
from be-
tween the teeth. Wrap a cloth a-
round the drive pinion flange to
act as a brake.
Rotate the drive
gear back and forth
(use a box
wrench in the drive gear attaching
bolts for a lever)
until a clear
tooth contact pattern is obtained.
Certain types of gear tooth con-
tact patterns on the drive gear in-
dicate
incorrect
adjustment. Noise
caused by
incorrect
adjustment
can
often be corrected by re-adjusting
the
gears.
Typical patterns and the
recessary
corrections
ar~
explained
on page 4-6
Gear tooth r:unout can !lometimes
be detected by an erratic pattern
on the teeth. However, a rlial indi-
cator should be used to measure
the runout of the back face of the
drive
gear,
as shown in
Fig
31
This runout
should
not exceed .005
mch.
DIFFERENTIAL HOUSING AND
DRIVE PINION REMOVAL
1.
Remove the differential bear-
ing
cap bolts and bearing caps.
2.
Use a
spreader (Tool
4010-A,
Fig 32) to facilitate the removal of
the differential housing and bear-
ing cups (see paragraph of
"Instal-
lation:
Differential Bearing
Pre-
load" for spreader details).
FIG.
31-Ring Gear Runout
Check
Under no circumstances should
the
carrier be spread more than
.020
inch.
3. If
the
differential bearings
arc to be removed use the tools
shown
in Fig. 33 to remove the old
bearings and
install
the new bear-
ings
in a press using replacer tool
4221A-B Fig.
34.
4. Remove the bolts that attach
t.he
drive gear to the differential
t::ase.
Press the drive gear from the
case
or tap it off with a soft-faced
hammer.
FIG.
32 -Differential
Housing Spreader
5. With a drift, drive out the
differential
pinion shaft
retainer
pin.
6. Drive
out
the
differential
pinion shaft with a drift.
7. Use a soft drift to separate
the
two
piece
differential case.
Drive apart through the axle bore
onto one differential wheel
(See
Fig. 35).
8. Remove the differential side
gear
differential
pinions
and
washers.
Advertisement
