Kubota ZD221-48 Workshop Manual page 88

ZD221, WSM ENGINE
Thermostat Valve Opening Temperature
1. Suspend the thermostat in the water by a string with its end
inserted between the valve and seat.
2. Heating the water gradually, read the temperature when the
valve opens and leaves the string.
3. Continue heating and read the temperature when the valve
opens approx. 8 mm (0.315 in.).
4. If the measurement is not within the factory specifications,
replace the thermostat.
Thermostat's valve
opening temperature
Factory spec.
69.5 to 72.5 °C
157.1 to 162.5 of
Temperature at which
thermostat completely
opens
Factory spec.
85°C
185 of
3EEABAB1P160A
1-S16