Thermostat: Testing and Inspection
INSPECTION OF THERMOSTATINSPECT THERMOSTAT
HINT: The thermostat is numbered with the valve opening temperature.
(a) Immerse the thermostat in water and gradually heat the water.
(b) Check the valve opening temperature
Valve opening temperature: 80 - 84°C (176 - 183°F)
- If the valve opening temperature is not as specified, replace the thermostat.
(c) Check the valve lift.
Valve lift: 8.5 mm (0.335 in.) or more at 95°C (203°F)
- If the valve lift is less than specification, replace the thermostat.
(d) Check that the valve spring is tight when the thermostat is fully closed.