The reasons for the
diesel engine water pump not being filled with water may include thermostat failure, cooling circulation water pump problem, belt drive failure, air resistance problem after replacing the coolant, scale accumulation, and low-temperature environmental impact.
Thermostat malfunction: The function of the thermostat is to open when the water temperature reaches a certain level, allowing the cooling water to circulate. If the thermostat is damaged and the cooling water circulation valve cannot be opened, it will cause the temperature of the upper and outlet pipes to be too low, thereby affecting the normal operation of the water pump.
Cooling circulation water pump problem: If the cooling circulation water pump is damaged, the cooling water inside the engine cannot circulate effectively with the cooling water in the radiator, resulting in a low temperature of the upper and outlet pipes, which affects the pumping capacity of the water pump.
Belt drive failure: If the cooling water pump is driven by a belt, a loose or damaged belt can affect the normal operation of the water pump, thereby affecting the circulation of cooling water and the temperature of the upper and lower water pipes.
Air resistance problem after replacing the coolant: When replacing or adding coolant, if air is mixed into the circulating water path, it will form an air resistance, affecting the normal circulation of the cooling water and causing low temperature in the upper and outlet pipes.
Scale accumulation: If the dedicated coolant is not replaced for a long time, the accumulated scale in the body may block the circulation channel, affect the flow of cooling water, and cause the temperature of the upper and lower water pipes.
Low temperature environment impact: When working in a low temperature environment, it is normal for the temperature of the upper and lower water pipes to be low at the beginning, because the thermostat has not yet started circulation. However, as the temperature rises, it should be restored to normal in a timely manner.
After understanding the causes of these faults, corresponding maintenance measures can be taken based on the specific situation to ensure the normal operation of the diesel engine and maintain a reasonable temperature of the upper and lower water pipes.
