Axles; Axle Testing And Diagnosis - Jeep 1979 CJ-5 Technical & Service Manual

2F-1
Axles Testing mi Diagnosis 2F-1
Front Axis
2F-2
Rear Axle
ZF-14
P a p
Standard Differentia!
2F-21
Tools
2F-50
Trac-Lok Differential
2F-40
mm® M M ®
wMsimmm
Axil Tssfs 2F-1
Axis Noisy m Coast 2F-2
Axle Noisy 11 Pill 2F-2
Axle Noisy on Pull i l l Coast 2F-2
Baoklash 2F-2
litter—Trac-Lok Differential
Seieral
Otler Axle Conditions
Tin Noise list
Wheel Bearing Test
P i p
2F-2
iZF-1
I 2F-2
i2F-1
I 2 M
1E1ERAL
When diagnosing an axle noise condition, obtain a
complete description of the noise and driving conditions
when the noise occurred. A preliminary road test with
the owner demonstrating the complaint condition is
recommended.
The action of transmitting engine torque to the wheels
will produce some noise in all axles. Slight axle noises
confined to a brief speed range or specific period are
considered normal.
Noises produced by the engine, transfer case, trans-
mission, tires, wheel bearings, exhaust system, prop-
eller shaft, or the action of wind on the body or grille
may be incorrectly diagnosed as axle noise. It is impor-
tant to test the vehicle thoroughly in order to isolate the
problem component and avoid unnecessary repair.
During the road test, stop vehicle, shift the transmis-
sion into neutral, and operate the engine at various
speeds. If the noise is heard during this test, the noise is
being produced by the engine, exhaust system, clutch,
transmission, transfer case, or by engine driven ac-
cessory equipment.
Before road testing, check and correct the tire in-
flation pressures and axle lubricant levels.
TIRE NOISE TEST
Because certain types of tire tread wear or tread pat-
terns may produce objectionable noises, drive the ve-
hicle on various types of road surfaces and listen for a
change in the noise. If the noise varies with the type of
road surface, the tires may be causing the noise.
WHEEL BEARING TEST
Worn, loose, or damaged wheel bearings can be con-
fused with axle noises. Wheel bearing noise is usually
more noticeable when coasting at lower vehicle speeds.
Applying the brakes gently while the vehicle is moving
will usually change wheel bearing noise. Another test
involves turning the vehicle alternately left and right
while moving straight ahead at relatively low speed.
This manuever side-loads the bearings and should cause
the problem bearing to become noisier.
AXLE TESTS
Before testing the axle, drive the vehicle a distance
sufficient to warm the axles and axle lubricant. During
the test, operate the transmission and transfer case in
every gear combination.