High water temperature of diesel engine will usually cause  boiling coolant in the radiator , the power decreases, the viscosity of the lubricating oil decreases, the friction  increases, and even cause the diesel engine to pull the cylinder and cylinder head gasket burned.

Below are main reasons for the high temperature of the diesel engine and preventions and improvements.

● Diesel engine long time overload operation will increase fuel consumption and heat load, resulting in water high temperature.So please avoid long time overloaded operation.

● Please check the coolant stock in the radiator and expansion tank, and replenish it in time when the liquid level is low. Because  lack of coolant will affect the heat dissipation effect , and resulting in high temperature of the diesel engine.

● If the hydraulic oil radiator and the water radiator are placed in tandem, when the temperature of the hydraulic oil is high, the temperature of the cold air on the air 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 to reduce the influence of the hydraulic oil radiator on the poor heat dissipation of the water radiator of the diesel engine.

● Please check whether the fan belt is loose and whether the fan shape is abnormal.If the fan belt is too loose, it is easy to cause the fan speed to decrease, causing the radiator cannot play the due heat dissipation capacity, and resulting in excessive diesel engine temperature. In addition, the deformation of the fan will cause the heat dissipation capacity of the radiator to not be fully fulfilled.

● The radiator surface attached debris is the most common phenomenon, the attached debris will reduce the radiator cooling area, the windward area of the radiator, resulting in the heat dissipation capacity of the radiator, causing high temperature of diesel engine.Therefore, the radiator should be cleaned regularly.

● 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.

(Kindly Reminder：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.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.