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Thermostat failure can cause diesel generator sets to overheat and fail quickly!

July 12, 2022
The thermostat is an important part of the diesel generator cooling system, usually installed near the front of the generator, its role is to keep the generator coolant at the most effective temperature, the thermostat works on a very simple principle, the central paraffin material in the thermostat expands, producing mechanical activity to open the thermostat, so that the coolant can pass through the radiator, the thermostat opening temperature is different, the usual thermostat temperature is 180 ° F , 195°F and 210°F. The user must follow the generator manufacturer's recommendations to determine the correct thermostat temperature. When the thermostat fails, it will cause the unit to overheat and the failure will occur very quickly.
Troubleshooting: If the engine has overheated and the fault occurs quickly, there may be a problem with the thermostat. If the thermostat
remains closed, no coolant can flow through the thermostat to the radiator.
Service: Follow these steps to remove and inspect the thermostat (note: make sure the cooling system is at room temperature before starting work)
(1) Drain the cooling system and store all coolant.
(2) Remove the radiator upper hose from the thermostat
(3) step on the thermostat housing so that the thermostat can be removed
(4) Inspect the thermostat.
(1) suspend the thermostat in a container of hot water with a thermometer
② Increase the water temperature in the container until the thermostat starts to open. You can see the thermostat loose-leaf in the open, and the thermostat should remain closed when the temperature is lower than the number stamped on the thermostat by about 10 °F.
③The thermostat should be fully open when the temperature is higher than the number stamped on the thermostat by approximately 25°F.