There are many kinds of sliding bearing of one engine, whether it is Bush or Bush are part of the sliding bearing. In order to ensure the engine running accuracy, functioning of these plain bearings clearance requirement is very high. Cause of engine sliding bearing failure can be the answer to: lubricate critical State and causing damage running space of any interference and damage of oil-film of any substance. Install bump adjustment is not accurate, parts such as injury and poor cleanliness, incorrect use, harmful chemical reactions can lead to bearing damage. According to United States Cummins Engine failure in his analysis of statistics, there are four major cause of bearing damage caused. These four areas accounted for failure are as follows:
　　1, due to damage caused by cleaning for 45%;
　　2, due to damage caused by lubrication of 25%;
　　3, the damage arising from the use, installation of 15%;
　　4, because of the damage caused by surface reaction and others for 15%.
　　We can see from this statistical ratio, clean the bearing is damaged as the main reason. Work to prevent damage due to poor cleanliness is multifaceted: ensure cleanliness of the parts in engine Assembly is only one side, on the other hand is the engine used in the process. Operators and maintenance personnel must be correct use of maintenance checks in a timely manner, as required, particularly in the long term in the dust and chemical raw material environment of the engine, it is important to take measures to prevent dust and chemical erosion, ensure the engine's service life. Motor spindle w, w alloy layer on surface of connecting rod in the soft, loading the most, are most vulnerable to injury, so below on the main shaft and connecting rod of surface damage, to analyze the reasons to avoid fault recurs after a repair.
　　When the oil filter and engine oil pan drain plug was first out of the dozens of CC's of engine oil, directly with the naked eye to see, and more of the alloy powder, Bush had been chafing. This is due to movement of small particles of impurities into the bearing alloy layer surface, although Bush did not cause serious damage, but if such phenomena will continue to grow, Bush not only early damage, shaft will also have serious injuries, so to exclude must be of the failure timely, avoid damage to the components. After troubleshooting the engine axle Bush's life cannot be used by normal wear and tear of time, because once the tiny particles of abnormal wear the equivalent of 2,500 hours of normal use of the engine wear.
　　Tiny particles into the cause: is poor air filter the filter or intake system sealed well, to inspect the air intake system of pipes and connections, there is no break and loose also check the filter loose paper core there is no break. Both the maintenance and the maintenance check of the entire intake system is very important, you must ensure that reliability. Was added engine lubricating oil is contaminated, or the second oil and filter cartridge used for too long all of the filter cartridge is clogged, it enables the lubricating oil on the surface of without the filter directly into the. So add oil, bearing in mind that the oil clean, equipped with the necessary filtration machines as well as regulations concerning the use of timely oil changes and filter. Third, too much fuel oil combustion finished no, nozzle leakage, resulting in fuel into the crankcase, while some impurities mixed with fuel into the crankcase and oil reduced lubrication. Engine is being used to observe engine exhaust and the functioning, if exceptions to promptly find out the reason for repair or replacement. Four is the engine Assembly, poor cleanliness of the internal parts. In the repair and maintenance of the engine, it is important to note that parts for cleaning, installation should pay attention to prevent further pollution, ensure that after installation of internal cleanliness.



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