Diesel engine high temperature reasons:

First, long time overload work

When the diesel engine is overloaded for a long time, it will increase its fuel consumption and increase the heat load, resulting in excessive water temperature. To this end, the diesel engine should be prevented from overloading for a long time.

Second, the shortage of coolant

If the coolant is missing in the diesel engine cooling system, it will affect the heat dissipation effect of the diesel engine and cause the diesel engine to have a high temperature. In this regard, the amount of coolant in the radiator and expansion tank should be checked frequently. When the liquid level is low, it should be replenished in time.

Third, the heat sink interferes with each other (construction machinery)

If the hydraulic oil radiator and the water radiator are placed one after the other, when the temperature of the hydraulic oil is too high, the temperature of the cold air on the inlet side of the water radiator will be high, which will affect the heat dissipation of the water radiator. In this regard, the heat dissipation of the hydraulic system should be overhauled, and the effect of the hydraulic oil radiator on the poor heat dissipation of the diesel water radiator should be reduced.

Fourth, the fan belt is too loose or the fan is deformed

If the fan belt is too loose, it will easily cause the fan speed to decrease, causing the radiator to fail to exert its proper heat dissipation capacity, resulting in excessive diesel engine temperature. In addition, fan deformation can also cause the heat dissipation capability of the heat sink to be insufficient. In this regard, the diesel fan belt should be regularly checked for looseness and abnormal fan shape.

Fifth，The surface of the radiator is attached with debris.

The adhesion of the surface of the radiator will reduce the heat dissipation area of the radiator, and the windward area of the radiator will decrease, resulting in a decrease in the heat dissipation capability of the radiator and causing high temperature of the diesel engine. The most common phenomenon is the attachment of debris to the surface of the radiator.

I will introduce you to the precautions during the cleanup process:

After removing the air filter, use a brush or other tool to remove large debris, then rinse the air filter with high-pressure water or gas. To facilitate cleaning of the core of the radiator, remove the air hood and fan guard. Parts.

When flushing the heat sink, the nozzle should be as perpendicular as possible to the plane of the heat sink. The nozzle should be kept at a distance of 10 to 30 mm from the heat sink. The nozzle pressure should be adjusted according to the thickness of the heat sink core. If conditions permit, use a high pressure water stream to clean it again with compressed air, as above. After the cleaning is completed, the parts that have been removed and removed are cleaned.

Sixth, the coolant circulation is not smooth

Insufficient opening of the thermostat will reduce the heat dissipation capacity of the diesel engine cooling system. If the diesel engine is hot, you can put the thermostat into the water for heating inspection. The opening distance of the general thermostat is 8~10mm.

Reminder: Poor pump performance will cause the coolant flow to decrease, causing the diesel engine to heat up.

Therefore, when checking the radiator and the lower water chamber, the temperature difference between the upper and lower water chambers is generally 6 to 12 ° C. If it is too small, the water pump can be replaced. Excessive scale will also affect the heat dissipation efficiency of the fins inside the radiator and reduce the thermal conductivity of the coolant and cold air. In this regard, the diesel engine cooling system should be cleaned regularly, while avoiding the use of inferior coolant to reduce scale formation.