What is the reason for the damage of the automobile water pump blade?

Posted by bruce zhu on January 13th, 2021

Some sinotruk howo truck engine water temperature is too high, the water tank boiling fault, the final inspection result is that the water pump VG1500060051 is broken. After the pump was removed, it was found that the blades on the pump were damaged or even disappeared. Whats happened?

The function of sinotruk engine water pump VG1500060051 is to pressurize the coolant to ensure its circulation in the cooling system. Centrifugal pumps are widely used in automobile engines. Its working principle is: when the sinotruk howo engine is running, the crankshaft drives the water pump VG1500060051 impeller to rotate through the belt, and the coolant in the water pump is driven to rotate together by the impeller, and is thrown to the edge of the water pump shell under the action of centrifugal force, at the same time, it generates a certain pressure, and then flows out from the outlet pipe. At the center of the impeller, the pressure drops because the coolant is thrown out, and the coolant in the radiator flows into the center of the impeller through the water inlet pipe under the pressure difference between the water pump inlet and the impeller center. In this way, the coolant circulates in the engine, taking away the excess heat of the engine and releasing it to the surrounding air.

The structure of sinotruk howo truck water pump VG1500060051 is relatively simple, which is composed of impeller, shell and water seal. The impeller is the core part of the pump, which is generally made of cast iron or plastic. The impeller usually has 6-8 radial straight blades or backward curved blades. The main damage forms of water pump are blade damage and water seal leakage, among which blade damage is the main damage factor of water pump.