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COOLING SYSTEM
7-9
(2) Immerse the thermostat in a container of warm
water so that the pellet of the thermostat is complete-
ly covered. The pellet must not touch the bottom or
sides of the container.
(3) Heat the water and stir it continuously (to
insure uniform temperature) and test the water tem-
perature with a thermometer at the point when a
.003" feeler gauge can be inserted into the valve open-
ing. The feeler gauge should pass freely into the
valve opening at a water temperature of 175" to
185°F.
If
outside of this range, replace the thermo-
stat.
(4) Continue heating the water to approximately
200°F. The thermostat valve should be fully open at
this temperature. If it does not, replace the thermo-
stat.
Installation
(1) Using a new gasket, position the thermostat
so the pellet end is toward the engine and attach with
bolts through the thermostat housing.
(2) If removed, reinstall or replace the upper hose
using Tool C-3250.
(3)
Fill
the cooling system to 1% inches below the
filler neck with water and rust resistor or water and
antifreeze.
RADIATOR HOSES
The hoses are removed and installed using hose
clamp pliers Tool (2-3250.
A hardened, cracked, swollen or restricted hose
should be replaced.
The reinforcement spring inside the lower hose is
necessary to prevent collapsing of the hose due to
suction at medium or high engine speeds. If this
spring is weak or broken, it should be replaced.
RADIATOR PRESSURE CAP
A 14 psi pressure-vent type radiator cap (Fig. 11) is
used as standard equipment
(16
psi for air condi-
tioned vehicles).
When removing the pressure cap, turn the cap coun-
ter-clockwise to the stop permitting any pressure to
GASKET
VENT VALVE
6 4 x
186
Fig.
I
I-Radiator
Pressure Cap
be released through the overflow tube. This will pre-
vent hot water from spraying out of the radiator
filler opening after pausing at the stop, continue turn-
ing counter-clockwise until the cap is released.
The brass vent valve at the bottom of the cap should
hang freely. If the rubber gasket has swollen and pre-
vents the vent valve from hanging loosely, the cap
should be replaced.
Pressure Testing the Radiator Cap (Fig.
121
(1)
Attach the neoprene seal and adapter to tester,
To01 (2-3499.
I
PRESSURE CAP
L 7
Fig. 12--Testing
the Pressure Cap
(2) Dip the pressure cap in water and install the
cap on the tester adapter.
(3) Apply pressure to the cap. If the pressure cap
fails to hold pressure within a range of 12 to 15 psi,
replace with a new tested cap. (Air conditioned vehi-
cles caps should test between 15 and 16 psi.)
PRESSURE TESTING THE COOLING SYSTEM
(1) For testing purposes only, fill the radiator to
(2) Wipe the filler neck sealing surface clean.
(3) Attach a tester Tool C-3499 to the filler neck
within
Y 2
inch of the filler neck.
and apply
15
psi pressure (Fig. 13).
Fig. 13-Pressure
Testing the Cooling System
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