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5-8
NOISE DIAGNOSIS
REAR AXLE ASSEMBLY
(178)
ever, it is not recommended as a regular substi-
tute for these tools
.
The use of the pinion set-
ting gauge and dial indicator as prescribed in
installation instructions will provide a more
accurate adjustment of ring and pinion gears
and will save considerable time.
1. Place car stands solidly under rear axle
housing 'so that wheels are clear of floor.
2.
Clean rear end of chassis, bottom of body,
and
axle housing,
r
emoving
as much dirt as
possible.
DO NOT TAKE CHANCES OF GET-
TING ABRASIVE SUBSTANCES INTO
AXLE HOUSING OR
BEARINGS.
3. Drain rear axle housing by removing
lower
cover
bolts, then reinstall bolts. Thor-
oughly
flush rear axle housing with SAE 10-W
or flushing oil. When flushing, put transmission
in high gear and run rear axle slowly for one
or two minutes. CAUTION: Do not
suddenly
accelerate or
"gun" the engine and do not
ex-
ceed
a
speed
of
25
MPH. Do not us
e
gasoline,
kero
sene,
or steam for flushing (see
par.
5-12)
.
Drain
housing, remove
cover, and wipe out
housing with clean cloths.
4. Wipe ring and pinion
gear
teeth dry with
clean cloth.
Paint ring gear teeth lightly and
evenly with red lead or white lead of suitable
consistency.
.
5.
Lightly apply the brakes so that rear
wheels
have a one-hand drag, then run the en-
gin e
slowl
y
with transmission in first gear,
then in r
everse,
for just a few seconds.
6. Compare marks produced on gear teeth
with marks shown in views A through E in
figure
5-2.
Marks should be as shown in view
A.
If
marks are as shown in views
B,
C, D, or
E, the gears are not correctly adjusted and
may be noisy in operation.
7. Gears marked as shown in views
B,
C, D,
or E should be adjusted as indicated opposite
these views in figure 5-2. Adjustment will
be
satisfactory in most cases where gears are
comparatively new and not improperly worn
or scored.
If
gears have been run long enough
to wear the teeth appreciably, however, it is
unlikely that adjustment will produce quiet
operation.
8. Procedure for sidewise adjustment of
ring gear is given in paragraph 5-23.
If
adjust-
ment of pinion is required it will be necessary
to remove pinion and propeller shaft and
change total thickness of pinion bearing
shim,
as described in paragraph
5-22.
9.
After making the
adjustment indicated,
re-paint ring gear teeth and run gears
aga in
as described in step 5, above. Final marking
should be as shown-in view A,
figure 5-2.
Wh
en
proper tooth contact is obtained, wipe lead
from
gears
and ca r r ier with cloth moistened
with clean gasoline or
kerosene.
Wipe out
housing with clean cloths.
10. Pour a liberal
quantity
of rear axle lubri-
cant on gears and bearings, and turn rear
wheels to work lubricant into all surfaces.
11. Install housing cover, using a
new
gasket
and coating bolt threads with
white
lead to
avoid oil leaks. Align filler plug with first bolt
hole to right of lower center bolt hole in
housing. This change from straight
down
posi-
tion increases oil level to 4
pints.
12. Remove car stands so that car is level,
and fill housing to filler plug opening with
approved rear axle lubricant. See paragraph
1-9.
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