6-12 COOLING AND LUBRICATION SYSTEM
THERMOSTAT CASE ASSEMBLY
REMOVAL
• Drain the engine coolant. (#2-18)
• Place a rag under the thermostat case.
• Remove the thermostat case cap

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 between flange, as shown in the photograph.
• Immerse the thermostat in the WATER contained in a beaker,
as shown in the illustration. Note that the immersed thermo-
stat is in suspension. Heat the water by placing the beaker on
a stove

1 and observe the rising temperature on a thermom-
eter

2.
• 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 be within the standard
value.
% Thermostat valve opening temperature
Standard: Approx. 88 °C (190 °F)
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