柴油机工作时,冷却水的正常温度应保持在75～90℃,此时柴油机可发出最大功率,燃油消耗最经济,机件磨损也不大。如果冷却水的温度过高或过低,或者擅自拆除节温器,就会使冷却系统的功能降低或丧失。因为柴油机在工作时,燃料燃烧会放出大量的热能,气缸内气体温度高达1800～2 000℃,而燃烧产生的热能中只有30％～40％转变为机械能,约有20％～25％被冷却系统带走。如果冷却系统工作失常,冷却水温度过高或过低,不仅会影响柴油机的正常工作,甚至会产生故障和事故。 Diesel engine work, the normal cooling water temperature should be maintained at 75 ~ 90 ℃, at this time the maximum power emitted by the diesel engine, fuel consumption is the most economical, mechanical wear is not large. If the cooling water temperature is too high or too low, or remove the thermostat, will make the cooling system function reduced or lost. Because the diesel engine at work, the fuel combustion will emit a lot of heat, the cylinder gas temperature as high as 1800 ~ 2 000 ℃, and combustion heat generated only 30% ~ 40% into mechanical energy, about 20% ~ 25% is cooled System away. If the cooling system malfunction, cooling water temperature is too high or too low, it will not only affect the normal operation of the diesel engine, and even failure and accidents.