8-14 COOLING AND LUBRICATION SYSTEM
THERMOSTAT
REMOVAL
• Remove the leg shield and footboard. (9-10, 9-18)
• Drain a small amount of engine coolant. (2-20)
• Place a rag under the thermostat case.
• Remove the thermostat case.
• Remove the thermostat
1.
INSPECTION
Inspect the thermostat pellet for signs of cracking.
Test the thermostat at the bench for control action, in the follow-
ing manner.
• Immerse the thermostat
1 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 and observe the rising temperature on a thermometer
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 satisfy the standard value.
Thermostat valve opening temperature
Standard: Approx. 88°C (190 °F)
* Do not contact the thermostat
1 and the column
thermometer
2 with a pan.
* As the thermostat operating response to water tem-
perature change is gradual, do not raise water tem-
perature too quickly.
* The thermostat with its valve open even slightly
under normal temperature must be replaced.
Water
String
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