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.

一、Overload operation

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.

二、Insufficient coolant

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.

三、Fan belt overloose or fan deformation

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.