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114
FIAT - 850 PASSENGER CARS
Fig. 181 • Pulling differential cage roller bearing cones.
1. Puller A. 40005/2/6.• 2. Puller item /20 B.• 3. Rolter bearing
cone. - 4. Ring gear.
Inspection and Repair.
rJ
The components of differential carrier assembly
must be painstakingly examined to check on their
serviceability
I
state of wear as well as damages
and any other irregular condition.
Fig. 188 _ Removing differential carrier caps.
1. Cap. - 2. Cap screw.• 3. Roller bearing.
The pinion gear shaft should no present roughness
or excessive wear; otherwise replace
it
by
a new one.
The ring gear and pinion, the side gears and
pinion gears must show no chips, cracks or exces-
sive wear; replace as required.
Check the condition of bearings: no roughness
on spinning should be felt and no damage or remark-
able wear observed; renew bearings,
if
necessary.
If
light marks or imprints are detected at contact
face of pinion gear thrust washers, smooth them
out,
if
possible, otherwise renew thrust washers.
Thrust washers come for service
in
the following
thicknesses:
.0275" - .0315" - .0354" - .0394"
.0433" - .0472'· - .0512'· - .0551"
(0.7 - 0.8 - 0.9 -I - 1.1 -1.2 - 1.3 - 1.4
mm).
Fig. 189 - Tightening differential carrier cap screws.
1. Cap screw. - 2. Cap•• 3. Torque wrench•• 4. Roller bearing
adjuster.
Assembly.
For correct assembly of differential carrier,
proceed as directed hereafter.
Install the clutch shaft and secure by pin and
retainer.
Fit the inner cage assembly.
Install
in this
order: taper roller bearing cups,
differential carrier caps and adjusters (fig. 189).
Draw up carrier cap screws with 36.2 to 39.8 ft.lbs
(5 to 5.5 kgm) of torque.
Then adjust the mesh and backlash of the final
drive gear set as outlined
in
next two paragraphs.
Fit the bell housing and gasket and secure by
tightening mounting screws to a torque of 28.9 to
36.2 ft.lbs (4 to 5 kgm).
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