Thermostat: Testing and Inspection
INSPECTIONReplace the thermostat if the valve does not close completely at an ambient temperature or if the following test shows unsatisfactory results.
^ Inspection method
Immerse the thermostat and a thermometer in water. Raise water temperature gradually, and measure the temperature and valve lift when the valve begins to open and when the valve is fully opened. During the test, agitate the water for even temperature distribution. The measured value should meet the specification.
NOTE:
^ Leave the thermostat in the boiling water for more than five minutes before measuring valve lift.
^ Hold the thermostat with a wire or the like to avoid contacting with container bottom.
Starting temperature to open:
Non-turbo model 80 - 84°C (176 - 183°F)
Turbo model 76 - 80°C (169 - 176°F)
Fully opens:
Non-turbo model 95°C (203°F)
Turbo model 91°C (196°F)
Valve lift. 9.0 mm (0.354 inch) or more
