Diesel generator sets can be used for daily power generation and backup power in households, offices, and small to large enterprises. The cooling methods for diesel engines are categorized into water cooling and air cooling. Water-cooled diesel engines typically consist of components such as a water pump, radiator, fan, and thermostat, using water as the medium to transfer heat generated by the engine. Below, we will explore the working principle of water cooling in diesel generators and the correct methods for draining water.