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When a car engine is used for a long time, how to cool down is an important step to ensure the engine life, and the engine water pump has such an important function. Therefore, the majority of car owners in the daily maintenance and repair, do not miss the inspection of the pump, now Xiaobian for the majority of users to introduce the six steps to repair the pump, to ensure that the engine pump can cycle smoothly.
1. Check the pump body and pulley for wear and damage, and replace if necessary. Check the pump shaft for bending, journal wear, and shaft end threads for damage. Check the blades on the impeller for cracks and shaft holes for serious wear. Check the degree of wear of the water seal and bakelite gasket. If it exceeds the limit of use, replace it with a new one. Check the wear of the bearing. The clearance of the bearing can be measured with a gauge. If it exceeds 0.10mm, the new bearing should be replaced.
2. After the engine water pump is taken out, it can be decomposed in order. After disassembly, the parts should be cleaned and checked one by one to see if they are cracked, damaged or worn. If there are serious defects, they should be replaced.
3. Water seal and seat repair: If the water seal is worn and grooved, it can be smoothed with abrasive cloth. If it is worn out, it should be replaced. If the water seal seat has rough scratches, it can be repaired with a flat reamer or on a lathe. Replace the new water seal assembly during overhaul.
4. Allow welding repair when there are the following damages on the pump body: the length is within 3Omm, the crack does not extend to the bearing housing hole; the flange that is engaged with the cylinder head has a broken part; the oil seal seat hole is damaged. The bending of the pump shaft must not exceed 0.05mm, otherwise it should be replaced. Impeller blades should be replaced. If the pump shaft hole is worn out seriously, it should be replaced or set.
5. Check if the pump bearing is flexible or has abnormal noise. If there is any problem with the bearing, it should be replaced.
6. After the engine water pump is assembled, turn it by hand, the pump shaft should be free of jams, and the impeller and the pump casing should be free from rubbing. Then check the pump displacement. If there is a problem, check the cause and eliminate it. If the pump fails, the coolant will not reach the corresponding place, and its performance will not be effectively played, which will eventually affect the working condition of the engine. Therefore, the inspection of the pump must be strengthened.