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154
FIAT· 850 PASSENGER CARS
Fig. 266 • Installing reat wheel checking fixture.
1. Coil spring compressor A. 74052.
~
2. Gauge Ap. 5110/1 for toe-in
check.
compression and holding rear wheels vertically
(fig. 264);
_ compress coil springs by screwing up tool
shank with ratchet wrench A. 89854 until reference
marks on tool shank and clamp are lined up (fig. 264).
In these conditions the wheel shaft center (0,
fig. 262) should be at the distance «X) (correspond-
ing to some 6.102" - 155 rom) from the center of
hole
(I
P
l),
at rubber buffer mounting face;
_ affix
the
gauge
Ap.
5110/1
with clamp
Ap. 5110/6 to the wheel shaft (fig. 266);
_ check that the plunger at gauge front end
Fig. 261 - Checking rear wheel toe-in.
l.
Clamp Ap. 5110{6 10 be filled to gauge Ap. 5110/1. - 2. Plunger
for toe-in check.
touches upper control arm pin of front suspension
(2, fig. 267);
- to correct toe-in angle, as outlined earlier
I
work on clearance between holes and screws (A,
fig. 263) securing bracket B to body;
- next tighten screws
«(
A
l)
to 28.9 to 36.2 ft.lbs
(4 to 5 kgm) of torque, and draw up nuts C and D
(fig. 263) with 65.1 fUbs (9 kgm) of torque;
- repeat above procedure at the other wheel,
recalling that wheels should be toed-in by the
same angle.
NOTE ON SELF-LOCKING NUTS
When the threads, on which self-locking nuts of
the nylon ring insert type must be screwed, are in
good condition (free of burrs, rust, indents) or
when they are not cross milled, the self-locking
nuts may be screwed on and off more than once
until practicable.
However, it is advisable to check the unscrewing
torque and replace the nuts when said torque falls
below specified limits.
The unscrewing torque may be rated averagely
at 20
%
less than the nut drawing torque.
On the contrary, should the above mentioned
threads be cross milled, or even show burrs, rust
or indents, nuts must be used once only since
nylon ring is liable to be damaged with consequent
loss of self-locking ability.
If
when servicing is in progress it becomes
neces~
sary to screw and unscrew nuts on threads provided
with milled slit or in the above mentioned condi-
tions, it is recommended to use dummy nuts which
should be replaced by the self-locking nuts proper,
as soon as servicing terminates.
The self-locking nuts of the castellated type may
be screwed and unscrewed indefinitely since,
thanks to their special design, their locking ability
is never impaired.
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