wsm STW37 Workshop Manual page 96

STW34, STW37, STW40, WSM
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.
Thermostat's valve
Factory specification
opening temperature
Temperature at which
thermostat completely Factory specification
opens
1-S17
ENGINE
69.5 to 72.5 °C
157.1 to 162.5 °F
85 °C
185 °F
9Y1211109ENS0012US0
KiSC issued 11, 2014 A