The pump is one of the important parts of the automobile engine cooling system, the water pump is the role of the cooling liquid pressure, ensure the circulation flow in the cooling system, accelerate the heat emission. As a long-term operation of the device, the use of the process, the water pump will be a failure, how to examine and repair the fault, a lot of people will feel that the examination is very complex, fault repair directly,in fact, there are some minor glitches owners completely can be solved, do not spend “money wasted.”The car in use, if the pump is faulty or damaged, do the following inspection and repair.
1.Check the pump body and the belt pulley has no wear and damage, should be replaced when necessary. Check the water pump shaft bending, there is no shaft neck wear, the shaft end thread is not damaged. Check the impeller blade has no broken, the shaft hole wear is serious. Check the seal wear degree and bakelite washer, if more than the limit of use should be replaced with new parts. Check the bearing wear, gap available surface measurement of bearing, such as more than 0.10mm, should be the replacement of the new bearings.
2.After removing the pump, according to the order of decomposition. After the decomposition should be part cleaning, and then check them one by one, to see if there is crack, damage and wear, such as serious defects should be replaced.
3.Seal and seat repair: seal, such as wear and tear from the slots that can be polished emery cloth, such as excessive wear should be replaced even; seal seat if rough scratches, available flat reamer or a lathe repair. During the overhaul should be replaced with a new seal components.
4.On the pump body with the following injury allows welding repair: Length 3Omm less, does not extend to the bearing hole cracks; engagement with the cylinder head flange with breaking parts; seal bore for damage. Water pump shaft bending shall not exceed 0.05mm, or should be replaced. Impeller blades damaged should be replaced. Pump Shaft badly worn should be replaced or repaired casement.
5.Check the water pump bearing rotating flexible or abnormal noise, such as that the bearing has a problem, should be replaced.
6.The pump is assembled, hand rotation, the pump shaft and no blocking, impeller and pump shell without rubbing. Then check the pump discharge, if any problem, should check and eliminate the cause. If the pump fails, the coolant will arrive at the corresponding place cannot, its performance will not be effective, thus affecting the working condition of the engine. Therefore, we must strengthen the pump check.