Whether it is caused by water seal related parts or not, the key components of water pump are water seal and bearing, and their faults are mutual. If the structure of water pump and shaft bearing is well designed, the water seal will not be eccentric due to bearing wear, resulting in leakage and abnormal sound. It is recommended to turn the bearing by hand to see if it is stuck. If not, there is something wrong with the design of the water seal.
The structural design of the water seal itself is unreasonable. At present, it is found that the abnormal sound is caused by the design defect of the water seal itself. At present, most foreign water seal manufacturers mainly improve the structure of water seal heat dissipation analysis when the pump runs at high speed. Simply put, the rotation direction of the improved water seal design should be the same as that of the water pump. If abnormal noise is found by rotating the bearing by hand, it must be caused by the inconsistency between the design rotation direction of the water seal and that of the water pump.
Secondly, in order to protect your engine from cooling well, you must use the coolant specified in the engine manual, because the choice of coolant is very important for the matching of engine water channels and cooling system components.
Abnormal sound of water pump bearing
1, new bearing, due to the excessive radial tension during assembly, the rolling body is difficult to rotate, and it will make a low hum. The temperature of the bearing will increase.
2. If the oil in the bearing body is insufficient, the bearing will give out a uniform whistle during the movement, so it is necessary to refuel the bearing.
3. When the gap between the roller and the spacer is too large, the bearing will give out a uniform whistle during operation.
4. When the raceway surface or roller surface of the inner and outer rings of important official is peeled off, intermittent impact or jumping will occur during operation. If the bearing is damaged (including the isolation frame fracture, rolling element fracture, inner and outer ring fracture, etc.). ), there is a crackling sound in operation.
Abnormal sound of water pump
That is, the sound made by the loosening of the rotor parts on the shaft. This kind of sound is often periodic. If the impeller and shaft sleeve of the circulating water pump are loose on the shaft, it will make a banging sound. If this is because the bearing is bent, the collision sound will be louder, because the impeller and shaft sleeve tend to sag downward on the shaft, and there is a gap below the shaft.
However, when the convex surface at the important official surface rotates upward, it will hit the impeller and move upward, so it will make a periodic sound without waiting for the impeller to move. It must be pointed out that it is very dangerous for the water pump to run in this situation. In addition to the air leakage into the pump caused by the swing of the rotor parts, it is more serious to cause cracks in the impeller and fracture of the bearing (at the edge of the matching part).
Some rolling bearing spacers will have intermittent knocking sound when the shaft is running, because they are not pressed by the bearing. Due to the large gap between the distance sleeve and the shaft, when it is not axially pressed, the gap between the shaft and the shaft will appear below the shaft. However, due to accidental reasons, the gap will be brought to the top, and the fixed sleeve distance will fall down due to its own weight, making a slight collision sound with the shaft.