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80
FIAT·850 PASSENGER CARS
Fig. 133 • Lifting out radiator from underside of car.
1. Radiator. - 2. Coolant Inlet hose.
The thermostat valve should be wide open at
212
0
F (100
0
C).
The thermostat is calibrated on manufacture and
needs not be further adjusted.
Fig. 134 • TinnIng the radiator.
1. Radiator. - 2. Radiator service stand Arr. 22239.
Fig. 135 - Detail showing radiator mounting,
1. Supporting springs. - 2. Spring hangers.
In case of damage or fissures in thermostat bellows
the valve will open automatically allowing free
circulation of coolant through radiator.
To remove thermostat from cylinder head use
adapter socket A. 50111 in conjunction with ratchet
wrench A. 89854.
Check thermostat operation as follows:
- plunge thermostat deeply into a 50-50 mixture
of water and FlAT « Paraflu
11»
fluid and heat
uniformly using care that temperature does not
rise by more then 1.8
0
F (1
0
C) per minute beyond
140
0
F (60
0
C);
verify that valve opening and strokes comply
with the following figures:
Valve opening begins
\189
0
±3.6
0
F 87°±2° C
Minimum valve stroke
.295 in
7.5 rom
Temperature not above
212
0
F
100
0
C
Maximum valve stroke
.433 in
11 mm
Temperature of initial valve opening is taken to
correspond to a valve stroke not in excess of .004"
(0.10 rom).
Renew thermostat
if
it turns out to be unser-
viceable.
THERMAL SWITCH
The thenna! switch, which
is
secured to the
right rear end of cylinder head, sends impulses
to warn the driver of the coolant temperature
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