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TRANSMISSION - DIFFERENTIAL
113
DIFFERENTIAL
Noise Diagnosis and Corrections.
Thumping.
Make sure that no gear teeth or bearing races
are chipped or excessively worn.
For an easy location of differential faults proceed
as follows in order to make a reliable diagnosis
of the origin of differential noises experienced.
Drive the car at about 25 to 28 mph (40 to 45
Ianfh)
until you are thoroughly familiar
with all
car noises.
Now gradually increase the speed until you
reach 43 to 47 mph (70 to 75 lan/h). As the car is
gaining speed. notice any changes in the running
gear noises; notice the speed at which each noise
comes
in
and goes out.
Then release accelerator pedal and, without using
the brakes, allow the car to slow down to a dead
stop. Again make a note of every change in sound
and the speeds at which noises are most audible.
Determine the kind of noises perceived and
proceed as outlined hereafter.
Noises due to excessive backlash.
Check for too much backlash between ring gear
and pinion.
Check the drive pinion for too much axial play.
Noisiness on turns.
Check that: pinion gears are not too tightly fitted
on their shaft, pinion gear shaft surface is perfectly
smooth, side gears are not bound in their sup-
ports,
all
gears are neither chipped nor damaged
in any other way.
Check to make sure that the wear of side gears
and thrust washers is not excessive.
Noisiness on pull.
Check adjustment of differential cage bearings.
Check
ring
gear-ta-pinion backlash.
Replace the
final
drive gear set, if necessary.
Noisiness on coast.
Check meshing depth of bevel plIUon teeth
which may need to be moved away from or to-
ward ring gear.
Replace the
final
drive gear set, if necessary.
Disassembly.
The disassembly of differential carrier assembly
does not involve any special difficulty: just remove
the transmission rear cover, the carrier caps and
the cage assembly.
Next take the cage assembly apart, recalling that
puller A. 40005/2 in conjunction
with
items /6 and
/20 B must be used to remove taper roller bearing
cones (fig. 187).
12
13
14
'//
15
16
17
18
19
/~~
11
21
10
Fig. 186 • Side sectional view of transmission-differential across differential cage, final gear set and axle shaft slip joints.
1. Axle shaft. - 2. Axle shaft slip joint. - 3. Side gear thrust ring. - 4. Pinion gear shaft. - 5. Pinion gear. - 6. Side gear. - 7. Differential
cage roller bearing. - 8. Differential cage carrier cap. - 9. Oil boot cover. - 10. Oil boot. - 11. all seal. - 12. Oil seal retainer. - 13. Oil boot
baffle. - 14. Baffle gasket. - 15. Differential cage half. - 16. Drive pinion rear ball bearing. - 17. Drive pinion shim. -18. Drive pinion. -19. Ring
gear. - 20. Bearing retainer plate. - 21. Differential cage hall. - 22. Roller bearing adjuster.
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