Water pump is a key component in the vehicle cooling system. The engine will emit a lot of heat when burning, and the cooling system will transfer these heat to other parts of the body for effective cooling through the cooling cycle, so the water pump is to promote the continuous circulation of coolant. Water pump as a long time running parts, if the damage is bound to seriously affect the normal running of the vehicle, then how to repair in daily life?

In the use of the car if the pump failure or damage, can do the following inspection and repair.

1. Check whether the pump body and the pulley are worn and damaged, and replace it if necessary. Check whether the pump shaft is bent, journal wear degree, shaft end thread is damaged. Check whether the blade on the impeller is broken and whether the shaft hole is worn seriously. Check the wear degree of water seal and bakelwood gasket, such as exceeding the use limit should be replaced with a new piece. Check the wear of the bearing. The clearance of the bearing can be measured by a table. If it exceeds 0.10mm, a new bearing should be replaced.

2. After the pump is removed, it can be decomposed in sequence. After decomposition, the parts should be cleaned, and then check one by one to see whether there are cracks, damage and wear and other defects, such as serious defects should be replaced.

3. Water seal and seat repair: such as water seal wear groove, abrasive cloth can be ground, such as wear should be replaced; Water seals with rough scratches can be repaired with a flat reamer or on a lathe. New water seal assembly should be replaced during overhaul.

4. The pump body has the following allowed welding repair: the length is less than 3Omm, does not extend to the bearing seat hole crack; The joint edge with the cylinder head is broken part; The oil seal seat hole is damaged. The bending of the pump shaft shall not exceed 0.05mm, otherwise it shall be replaced. Damaged impeller blade should be replaced. Pump shaft aperture wear should be replaced or set repair.

5. Check whether the pump bearing rotates flexibly or has abnormal sound. If there is any problem with the bearing, it should be replaced.

6. After the pump is assembled, turn it by hand. The pump shaft should not be stuck, and the impeller and the pump shell should not collide. Then check the water pump displacement, if there is a problem, should check the cause and eliminate.