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REAR AXLE ASSEMBLY
NOISE DIAGNOSIS
5-7
back off all 4 bolts
14
turn. Remove bearing
adjuster lock on one side and mark adjuster in
line with lock slot in bearing cap. Slowly back
off adjuster until bearing outer race stops turn-
ing, noting number of notches required to reach
the breaking point. The number of notches,
or bearing preload should be 2% to 3.
If
bear-
ing does not turn as adjuster is back off, tighten
adjuster until bearing starts to turn, noting
number of notches required to just start bear-
ing turning. This will indicate the number of
notches that bearing was loose. Bearings should
•
be given preload of
2lj2
to 3 notches, using'
procedure given in paragraph 5-23.
7.
If
gear set is not mismatched, worn, or
scored, and checks made in steps 5 and 6 above
do not show cause for noise, remove differen-
tial ring gear and case assembly (par. 5-10).
Inspect differential side bearings (par. 1-13
&
1-14).
8. Test for pinion shaft bearing wear as
described in paragraph 5-1 step 2, and check
pinion setting (par. 5-21).
9.
If
pinion shaft bearings are worn or of
doubtful condition or pinion is not properly
set, remove pinion and propeller shaft assembly
(par. 5-11).
NOTE: On Dynafiow cars, rear
axle assembly must be removed to install pro-
peller shait spline oil
seal.
Replace bearings or
reset pinion as required.
5-6 CHECKING GEAR TOOTH CONTACT
The procedure described below may be used
before disassembly to check gear tooth contact
existing between ring and pinion gears, to
determine whether improper adjustment is
cause of noisy gear operation.
The procedure also may be used to check
adjustment following installation of gear set
when the specified tools are not available; how-
A SHOWS CORRECT
CONTACT.
GEARS SET UP THIS WAY GIVE BEST RE-
SULTS FOR NOISE AND
WEAR.
B SHOWS HEAVY CONTACT ON HEEL OF
TOOTH
.
GEARS SET UP THIS WAY WILL EVENTUALLY
BREAK OFF AT THE HEEL. TO CORRECT,
MOVE RING GEAR TOWARD PINION BUT
MAKE SURE
THE:~E
IS BACK LASH AS GEARS
CAN NOT RUN TIGHT.
C SHOWS HEAVY CONTACT ON TOE OF
TOOTH.
GEARS SET UP THIS WAY WILL EVENTUALLY
BREAK OFF AT THE
TOE.
TO CORRECT,
MOVE RING GEAR AWAY FROM PINION.
D SHOWS HEAVY CONTACT ON FLANK OF
GEAR TOOTH.
G
EARS SET UP
THIS WAY
A
RE NOISY. TO
CO
RR ECT, M
O VE PINIO
N
O
UT
UNTIL CON-
TACT
COMES
TO THE FULL W
ORKIN G
DEPTH
OF GEAR TOOTH WITHOUT LEAVING LOW-
EST POINT OF
CONTACT.
SEE A
E SHOWS HEAVY CONTACT ON FACE OF
GEAR TOOTH.
GEARS SET UP THIS WAY ARE ALSO NOISY
.
TO CORRECT, MOVE PINION IN UNTIL CON-
TACT REACHES LOWEST POINT ON GEAR
TOOTH
.
SEE A
Figure 5-2-Gear Tooth Contact Corrections
THE HEELOF GEAR TOOTH IS THE
LARGE END AND THE TOE IS THE
SMALL END
WO
RKING
DEPTH
CLEARANCE
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