In the upper outlet of the engine, a water pump is installed to drive through the fan belt to pump out the heat in the water channel of the engine block, and the cold water is pumped in to ensure circulation in the cooling system. Today we will introduce the small series to everyone. The engine water pump maintenance method in the engine of the car engine, there are a number of water channels for the cooling water circulation, and placed in the front of the car radiator (commonly known as the water tank) connected through the water pipe, constitute a large water circulation system, At the upper outlet of the engine, a water pump is installed, which is driven by a fan belt to pump out the heat in the water channel of the engine block, and the cold water is pumped in to ensure that it circulates in the cooling system and accelerates the dissipation of heat. As a long-term operating device, the water pump will also fail during use. How to repair these faults? Today, we introduce to you the method of engine water pump maintenance and hope to help the majority of owners.
Check the pump and pulley for wear and damage and replace if necessary. Check whether the water pump shaft is bent, the degree of wear of the journal, and the shaft end thread are damaged. Check whether the blade on the impeller is broken and whether the shaft hole wears seriously. Check the degree of wear of water seals and bakelite washers. Replace them if they exceed the limit of use. Check the bearing's wear condition, can use the watch to measure the bearing clearance, if exceed 0.10mm, should replace the new bearing.
After the water pump is taken out, it can be decomposed in order. After the decomposition, the parts should be cleaned and checked one by one to see if there are defects such as cracks, damage, and wear. If there are serious defects, they should be replaced.
Water seal and seat repair: If the water seal wears grooves, it can be grinded with an emery cloth, and should be replaced if it has worn out; if the water seal seat has rough scratches, it can be repaired with a plane reamer or on a lathe. Replace the new water seal assembly when overhauling. A weld repair is allowed on the pump body with the following damage: length within 30 mm, cracks that do not extend into the bearing housing bore; flanges that engage with the cylinder head have broken parts; and oil seal seat holes are damaged. The bending of the water pump shaft must not exceed 0.05mm, otherwise it should be replaced. Impeller blade damage should be replaced. The water pump shaft hole wear should be replaced or repaired. Check if the bearing of the water pump rotates flexibly or with abnormal noise. If there is any problem with the bearing, it should be replaced.
After the pump is assembled, rotate it by hand. The pump shaft should be free from sticking and the impeller and pump housing should not be rubbed. Then check the pump displacement. If there is a problem, check the cause and remove it. If the pump fails, the coolant will not reach the corresponding place, and its performance will not be effectively exerted, which will eventually affect the working conditions of the engine. Therefore, the inspection of the water pump must be strengthened.
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