1. Damage caused by larger particle foreign matter and inferior lubricating oil to bearing bush:
When large particles of alloy blocks or flakes are found in the oil filter cartridge and in the engine oil sump, the shaft and bearing bush have been severely damaged, and it is necessary to immediately stop the disassembly and repair, and if it continues to be used, it will cause more damage to the parts.
Reasons for larger particles entering: The parts are not cleaned during installation. For example, the metal chips generated when processing the inner hole of the connecting rod bushing remain in the oil passage of the connecting rod, the cutting and sediment are stuck in the parts and the oil passage, and the cleaning is not complete before installation. Or the machining burr cuffs of the machined parts associated with the moving surface are not removed, and the foreign matter or the surface of the shaft to which the larger particles are attached when the bearing bush is mounted is scratched. These phenomena are very serious damage to the bearing pads. Therefore, carefully clean and clean the cleaning and inspection during maintenance and installation.
The lubricating effect and heat dissipation effect of inferior lubricating oil can not meet the requirements, the bearing and shaft wear are intensified, the alloy surface temperature is too high, and the alloy of the bearing bush is melted and damaged. At the same time, the impurities of the inferior lubricating oil are more blocked, and the oil filter element is quickly blocked. Impurity lubricants enter the moving surface without filtration, further accelerating the damage of the shaft and bearing. Therefore, when purchasing and replacing lubricating oil, it is necessary to strictly control the quality of the lubricating oil according to the regulations, and select the lubricating oil according to the regulations.
2. Damage to the shaft and bearing bush by moving foreign objects:
There is a large foreign object between the bearing bush and the inner wall of the mounting hole of the tile. The moving surface of the bearing bush will produce bumps. When the shaft is running, abnormal wear will start from the bump and expand to the periphery, causing the shaft and Early damage of the bearing bush; if there is a large foreign object between the moving surface of the bearing bush and the shaft, it will be embedded in the alloy layer of the bearing bush after installation, and damage the bearing bush while damaging the shaft during operation; the shaft and the tile and the mounting hole, etc. Related parts can damage or damage the shaft and tile if they touch the bump.
Causes and prevention: shafts, bushings, bushing holes (body, connecting rod) are corroded to produce oxides or sticky sand. Before installation, carefully check and clean, especially the oil passage and tubing cavity; the installation site must be away from dust. Flying and debris-splashing sites; tools for installation should be cleaned and necessary protective measures should be taken to avoid re-contamination, while lubricating oil used in assembly should be cleaned to prevent dust from entering; shafts and bushings and bushings Store and install, make sure that it is not in contact with any metal objects and that there is no contact operation.
3, the damage caused by tiny particles foreign matter on the bearing bush:
When the oil filter element and the oil sump of the engine oil sump are in the first few tens of milliliters of engine oil, the bearing bush can be worn when the naked eye can directly see and more alloy powder. This is caused by the impurities of tiny particles entering the moving surface of the bearing alloy layer. Although the bearing bush is not seriously damaged, if such a phenomenon continues to develop, not only the early bearing bush will be damaged, but also the shaft will be seriously damaged. According to the cause of the fault, it should be eliminated in time to avoid damage to the parts. After the fault is removed, the service life of the engine bearing bush cannot be calculated according to the normal wear time, because the abnormal wear amount of the primary particles is equivalent to the wear of the engine for 2500 hours.
Reasons for the entry of tiny particles:
First, the filter effect of the air filter is poor or the air intake system is not well sealed. It is necessary to check the pipelines and joints of the intake system for cracks and looseness, and check whether the filter element is loose or not. Whether it is repairing or maintaining the inspection of the entire intake system is very important and reliability must be ensured.
Second, if the lubricating oil is contaminated and added to the engine or the oil and the filter element is used for a long time, all the filter elements are blocked, so that the oil on each lubricating surface enters the filter element without being filtered.
Third, the fuel supply is too large to burn, the nozzle leaks, causing fuel to penetrate into the crankcase, and some impurities are mixed with the fuel into the crankcase and the oil to reduce the lubrication effect. Therefore, the engine should pay attention to observe the exhaust and operation of the engine during use. If there is any abnormality, it is necessary to find out the cause for repair or replacement.
Fourth, the cleanliness of internal parts is poor when the engine is assembled. When repairing and maintaining the engine, be sure to pay attention to the cleaning of the parts. When installing, pay attention to prevent re-contamination and ensure the cleanness of the interior after installation.
In either case, the engine oil and machine filter must be replaced after troubleshooting. After the maintenance, the engine starts to run for two hours and stops running for inspection. There is no alloy powder in the oil before it can be used for half load. However, it must be observed during the first few days of use. After 60 to 120 hours of operation, it is confirmed that abnormal wear is completely eliminated. After the removal, the engine oil can be replaced and the engine can be put into normal use. If abnormal wear continues to develop, it must be discontinued for disassembly inspection and repair.
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