1, caused by tiny particles of foreign matter on the bearing galling:
When the oil filter and the engine oil pan drain plug, the first outflow dozens ml oil, the naked eye can see, and more alloy powder, bearing rubs. This is caused by tiny particles of impurities into the moving surface of the bearing alloy layer, bearing no serious damage, but such phenomena continue to develop, not only bearing the early damage, the shaft will be a serious injury, it must be in a timely manner according to the cause of the failure to exclude, to avoid damage to the parts. Troubleshooting rear engine bearing life can not calculate the time of use by normal wear and tear, because a tiny particles appears abnormal wear amount equivalent to 2500 hours normal engine wear amount.
Tiny particles into the reasons: First, the filtering effect of the air filter or intake system seal is not good, you want to check the air intake ministries piping and connections for cracks and loose, check the filter at the same time the availability of loose, Core for cracks. Either repair or maintenance inspection of the entire intake system is very important and must ensure reliability. Add engine oil and filter lubricating oil to be stained after prolonged use machine filter is clogged, so that the surface of the lubrication oil without filtration directly into. Filling oil to pay attention to the oil clean, equipped with the necessary filtration machine, at the same time by the use of the provisions of the timely replacement of oil and filter. Fuel oil the excessive combustion is incomplete, the nozzle leakage, causing the fuel to penetrate the crankcase, while some impurities with the fuel into the crankcase and oil mixed together to reduce the lubrication effect. Engine in use to observe the engine exhaust and running, if unusual to timely find out the reason for repair or replacement. Fourth, when the engine is assembled, the internal parts Poor cleanliness. Engine repair and maintenance, be sure to pay attention to the cleaning of the parts, installation should pay attention to prevent further pollution, ensure the installation of internal cleanliness.
No matter what kind of reason, troubleshooting must replace the engine the engine oil and filter.
Maintenance after the engine starts the empty running two hours to stop operation to check the oil alloy powder can be put into half load, but in the first few days must observe the judgment, after 60 to 120 hours operation confirmed abnormal wear was completely removed, and then replace the oil, the engine can be put into normal use. If abnormal wear continues to develop, we must stop the use the disintegration of inspection and repair.
2, the larger particles of foreign matter and poor quality lubricants bearing damage caused by:
In the oil filter and the engine oil pan larger particles of the alloy block or sheet, shaft and bearing has been serious injury, must be shut down immediately overhauled and repaired, if you continue to use it will cause more damage to components.
Larger particles into: Installation parts are not clean, such as metal shavings from the processing of rod bushing bore lifetime stuck cutting or sediment in the connecting rod oil passages, parts and oil passages, not thoroughly cleaned before installation or related to the running surface of the workpiece processing glitch flange is not cleared, the bearing installation sticky larger particles of foreign matter or shaft surface bumps. These phenomena are very serious damage caused by the pad. Maintenance and installation carefully clean up the cleaning and inspection.
Low-grade lubricants lubrication and cooling effect is mainly the bearing and shaft wear increased the sports surface temperature caused by excessive bearing alloy melting and damage, poor quality lubricants lot of impurities oil filter clogged quickly, containing without impurities Lube Filtration directly into the moving surface, to further accelerate damage to the shaft and the bush. Purchase and replacement of oil in accordance with the provisions of the strict control of the quality of lubricating oil, according to the provisions selection of lubricants.