6-12
COOLING
AND
LUBRICATION
SYSTEM
THERMOSTAT
REMOVAL
Dra~n the engine coolant. (137-15)
Place a rag under the thermostat case
Remove the thermostat case
(1).
Remove the thermostat
:2.
INSPECTION
Inspect the thermostat pellet for signs of cracking.
Test the thermostat at the bench for control action, in the follow-
ing manner.
Pass a string
O
between flange
(2
of thermostat, as shown.
Immerse the thermostat in the water contained in a beaker, as
shown in the illustration. Note that the immersed thermostat is
in suspension. Heat the water
81
bv placinq the beaker on a
.
.
-
stove
(4,
and observe the rising temperature on a thermome-
ter
(51.
Read the thermometer just when opening the thermostat. This
reading, which is the temperature level at which the
thermo-
stat valve begins to open, should satisfy the standard value.
Thermostat valve opening temperature
Standard: Approx.
76.5
"C
(169.7
OF)
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