在实际使用过程中，有错误的认识：柴油发电机的冷却液温度越低越好。其实，我们对柴油机冷却液温度的使用有明确的要求的。有些操作员喜欢将冷却液温度调节得很低。有的接近冷却液温度下限，有的低于冷却液温度下限。他们认为，如果冷却液温度低，水泵就不会出现气穴，冷却液就不会中断，而且在使用中有安全系数。实际上，只要冷却液温度不超过95℃,不会出现气穴，冷却液也不会中断。反之，如果冷却液温度过低，对柴油机的危害很大。
In actual use, there is a wrong understanding that the lower the coolant temperature of diesel generators, the better.In fact, we have clear requirements for the use of diesel engine coolant temperature. Some operators like to adjust the coolant temperature very low. Some are close to the lower limit of coolant temperature orlower than the limit of coolant temperature.They believe that if the coolant temperature is low, the water pump will not have cavitation, the coolant will not be interrupted, and there is a safety factor in use. In fact, as long as the coolant temperature does not exceed 95°C, no air pockets will appear and the coolant will not be interrupted. On the contrary, if the coolant temperature is too low, it will be very harmful to the engine.
1.随着润滑系统中机油粘度的增加，零件的运转阻力增大，导致润滑不良，零件间磨损加剧。例如，当冷却液温度为30℃,与冷却液温度80～90℃相比℃,缸套、活塞和活塞环的磨损将增加约5倍。
As the viscosity of the oil in the lubrication system increases, the running resistance of the parts increases,resulting in poor lubrication and increased wear between parts. For example, when the coolant temperature is 30°C, compared with the coolant temperature of 80 to 90°C, the wear of the cylinder liner, piston and piston ring will increase about 5 times.
2.冷却液温度低、柴油机缸内燃烧状况恶化、燃油雾化不良、后燃期延长、柴油机运转粗暴等，加剧了曲轴承、活塞环等零件的损坏，降低动力性和经济性。
Low coolant temperature could worse the combustion conditions in diesel engine cylinders, poor fuel atomization, prolonged afterburn period andrough diesel engine operation.Which will increase the damage of curved bearings, piston rings and other parts, reducing power and economy.
3.燃烧后的水蒸气容易在气缸壁上凝结，造成金属腐蚀。
The burned water vapor is easy to condense on the cylinder wall, causing metal corrosion.
4.未燃烧的柴油会稀释机油，导致润滑效果不好。
Unburned diesel will dilute the oil and cause poor lubrication.
5.燃油不完全燃烧会形成胶质，使活塞环卡在活塞环槽内，气门卡死，压缩结束时缸内压力降低。
Incomplete combustion of fuel will form gums, which will cause the piston ring to get stuck in the piston ring groove, and the valve will get stuck.When the compression ends, the pressure in the cylinder will decrease.