发动机水温过高通常会造成散热器内冷却液沸腾、功率下降、润滑油黏度降低、发动机零部件间摩擦加剧，甚至会导致发动机拉缸、汽缸垫烧毁等严重故障。底特律给大家总结出发动机高温的主要原因，同时提出一些改进措施：

4、散热器表面附着杂物 Debris attached to the surface of the radiator

散热器表面附着杂物不仅会使散热器散热面积减小，同时会使散热器的迎风面积减小，导致散热器的散热能力降低，引起发动机高温。散热器表面附着杂物是最常见的现象，本文结合散热器结构特点，介绍其清理过程中的注意事项。

The sundries attached to the surface of the radiator will not only reduce the heat dissipation area of the radiator, but also reduce the windward area of the radiator, resulting in a decrease in the heat dissipation capacity of the radiator and causing high engine temperature. The adhesion of debris on the surface of the radiator is the most common phenomenon.Here combines the structural characteristics of the radiator and introduces the precautions in the cleaning process.

的迎风面积减小，导致散热器的散热能力降低，引起发动机高温。散热器表面附着杂物是最常见的现象，本文结合散热器结构特点，介绍其清理过程中的注意事项。

The sundries attached to the surface of the radiator will not only reduce the heat dissipation area of the radiator, but also reduce the windward area of the radiator, resulting in a decrease in the heat dissipation capacity of the radiator and causing high engine temperature. The adhesion of debris on the surface of the radiator is the most common phenomenon.Here combines the structural characteristics of the radiator and introduces the precautions in the cleaning process.

由于散热器不容易整体拆卸，因此，只能对相关零部件进行拆卸。拆卸防尘网后，应先用刷子等工具清除大的杂物，然后用高压水流或气体冲洗防尘网，水流或气流压力建议保持1MPa以上。为便于对散热器的芯体进行清理，应拆除导风罩及风扇护网等零部件。

Since the radiator is not easy to disassemble, only relevant parts can be disassembled. After disassembling the dust-proof net, use a brush or other tools to remove large debris, and then use high-pressure water or gas to flush the dust-proof net. The pressure of the water or airflow is recommended to be kept above 1MPa. In order to facilitate the cleaning of the core of the radiator, parts such as the air deflector and fan guard should be removed.

冲洗散热器时，喷嘴要尽量与散热器平面垂直，喷嘴要与散热器保持10～30mm的距离，喷嘴压力要根据散热器芯体厚度进行调整。如果条件允许，用高压水流清洗后可再用压缩空气清洗一次，方法同上。如果条件限制只能用压缩空气，应先用水将散热器湿润，然后用压缩空气直接进行清理，气体压力应在2.5MPa以上。清洗完成后，装复拆下的零部件，即完成清洗工作。

When flushing the radiator, the nozzle should be as vertical as possible to the radiator plane, the nozzle should be kept at a distance of 10-30mm from the radiator, and the nozzle pressure should be adjusted according to the thickness of the radiator core. If conditions permit, it can be cleaned with compressed air again after cleaning with high-pressure water flow, the method is the same as above. If the conditions are restricted, only compressed air can be used. The radiator should be moistened with water first, and then cleaned directly with compressed air. The gas pressure should be above 2.5MPa. After the cleaning is completed, the removed parts are assembled and re-assembled to complete the cleaning work.

5、冷却液循环不畅 Poor coolant circulation

节温器开度不足，会降低发动机冷却系统大循环的散热能力。如果发动机高温，可以将节温器放入水中进行加热检查，一般节温器的开启距离为8～10mm。

Insufficient opening of the thermostat will reduce the heat dissipation capacity of the large cycle of the engine cooling system. If the engine is hot, you can put the thermostat in the water for heating inspection. Generally, the opening distance of the thermostat is 8-10mm.

水泵性能不良，则会造成冷却液流量降低，致使柴油机高温。对此，应检查散热器上、下水室。上、下水室的温差一般在6～12℃，如果偏小，可更换水泵。

Poor performance of the water pump will reduce the coolant flow rate and cause the diesel engine to become hot. In this regard, check the upper and lower water chambers of the radiator. The temperature difference between the upper and lower water chambers is generally 6-12°C. If it is too small, the water pump can be replaced.

水垢过多，也会影响散热器内翅片的散热效率，降低冷却液与冷风的导热能力。对此，应定期清洗柴油机冷却系统，同时，避免使用劣质的冷却液，以减少水垢的生成。

Too much scale will also affect the heat dissipation efficiency of the fins in the radiator and reduce the thermal conductivity of the coolant and the cold air. In this regard, the diesel engine cooling system should be cleaned regularly, and at the same time, avoid using inferior coolant to reduce the generation of scale.