If the water pump fails or is damaged during the use of the car, the following inspections and repairs can be done.

1. Check the pump body and pulley for wear and damage, and replace them if necessary. Check the water pump shaft for bending, journal wear, and shaft end threads for damage. Check whether the blades on the impeller are broken and whether the shaft hole is seriously worn. Check the water seal and bakelite. The degree of wear of the gasket, if it exceeds the use limit, the assembly should be replaced. Check the wear condition of the bearing, and measure the clearance of the bearing with a table. If it exceeds 0.1mm, replace it with a new one.

2. After the water pump is taken out, it can be disassembled in sequence. After disassembly, the parts should be cleaned, and then checked one by one to see if there are cracks, damage and wear defects. If there are serious defects, they should be replaced.

3. Repair of water seal and seat: If the water seal is worn and grooved, it can be smoothed with emery cloth. If it is worn too much, it should be replaced; if the water seal seat has rough scratches, it can be repaired with a flat reamer or on a lathe. New water seal components should be replaced during overhaul.

4. Welding repairs are allowed when the pump body has the following damages: cracks within 30mm in length that do not extend to the bearing seat hole; the flange jointed with the cylinder head is seriously damaged and should be replaced or repaired with inserts.

5. Check whether the water pump bearing rotates flexibly or makes abnormal noise. If there is a problem with the bearing, it should be replaced.

6. After the water pump is assembled, turn it by hand, the pump shaft should not be stuck, and the impeller and the pump casing should not rub against each other. Then check the displacement of the water pump. If there is any problem, check the cause and eliminate it. If the water pump fails, the coolant will not be able to reach the corresponding place, and its performance will not be effectively exerted, which will eventually affect the working condition of the engine. Therefore, it is necessary to strengthen the inspection of the water pump.

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