ENGINE
STW34, STW37, STW40, WSM
1-S17
Thermostat Valve Opening Temperature
1. Suspend the thermostat in the water by a string with its end
inserted between the valve and seat.
2. Heat the water gradually and read the temperature when the
valve opens and leaves the string.
3. Continue heating and read the temperature when the valve
opens approx. 6 mm (0.236 in.).
4. If the measurement is not within the factory specifications,
replace the thermostat.
9Y1211109ENS0012US0
Thermostat's valve
opening temperature
Factory specification
69.5 to 72.5 °C
157.1 to 162.5 °F
Temperature at which
thermostat completely
opens
Factory specification
85 °C
185 °F
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