Early damage to the sliding bearing burned much more common than the bearing, sliding bearing so early damage prevention is very important. Proper maintenance of the sliding bearing is to reduce premature bearing damage an effective way to extend bearing life is a reliable guarantee. Therefore, routine maintenance and repair of the engine, you must pay attention to the bearing surface of the alloy, the back end and look at the shape of the edge corners, if unusual signs of wear and tear or if more than half, we should seriously investigate the cause and take appropriate measures to improve the working conditions of the bearing, sliding bearing emphasis on the prevention of early damage.
① strict engine block main bearing bore concentricity and roundness measurements. For the main body bearing bore concentricity measurements must test out the engine block size than precise concentricity, simultaneous measurement of crankshaft runout, thereby matching the thickness of the bush, so that the gap in the axial oily reach consensus . Where diesel happened grind tile coaster, etc. who assembled on the body before the main bearing bore concentricity testing, ductile iron crankshaft all grow up to 0.14mm, steel crankshaft all grow up to 0.12mm, while the body bearing hole roundness, cylindricity have requested. If overrun is disabled, if the limits, then the use of grinding (ie bearing on the amount of red lead powder coated, after loading the crankshaft rotation, and then remove the bearing cap to check for bearing on a hard point convex After the parts of the scraping process, the amount of change measurements, thereby ensuring the reliability.
② improve bearing repair and assembly quality, strict control rod passing rate on the car. Improve bearing hinge with quality assurance bearings back smooth without spots, positioning bump intact; own bounce amount of 0.5 ~ 1.5mm, which can ensure the bearing after assembly with its own stretch fit with the bearing hole tightly; new , the old link is always required to measure their degree of parallelism and twist the rod unqualified prohibition on the car; mounted within the bearing bush down two at each end should be higher than the bearing plane 30 ~ 50mm, higher volume can be guaranteed to the specified torque tighten the bearing cap bolts bearing and housing closely with self-locking generate sufficient frictional force, the bearing will not loose, cooling effect, prevent erosion and wear of the bearing; bearing face can not be equipped with a scratch France reached 75% to 85% as measured by the standard contact patch should not scrape when the bearing and the journal with the gap to meet the requirements. In addition, the assembly should be careful to check the crankshaft journal and bearing the processing quality, strict implementation of repair process specifications, and prevent improper loading method is improperly installed and the bearing bolt torque uneven or non-compliance, resulting bending deformation and stress concentration, leading to premature bearing damage.
On the purchase of a new bearing for sampling. Focusing on the bearing thickness difference, and free opening size measurement, visual inspection of its surface quality. Bearing on the state is good for cleaning the old post-test, the implementation of the original body, original crankshaft, the original bearing, in-situ assembly use.
Assembly and engine oil to ensure cleanliness. Improve the cleaning performance of equipment, strict quality cleaning, diesel engine parts to improve cleanliness. Meanwhile, clean assembly environment of the scene, making cylinder dust cover, the engine assembly cleanliness has improved significantly.
③ reasonable selection and add oil. To use in the course of the lubricant film surface tension, so that the formation of bubble collapse impact on the role when the oil flow is reduced accordingly, to be effective in preventing bearing cavitation; lubricant viscosity grade can not be increased, so as not to increase the bearing coking tendency; engine lubricating oil level must be within the standard range, lubricants and fuel use tools must be clean to prevent any entry of dirt and water, at the same time ensure that the engine ministries seal. Note that regular inspection and replacement of oil; filling oil should place no pollution, no sand, to prevent the intrusion of all pollutants; different quality, different viscosity grades as well as different types of lubricants used not mix, oil filling ago settling time is generally not less than 48h.
④ proper use and maintenance of the engine. When installing the bearing, shaft and bearings should topcoat to provide grade movement is clean oil. Engine bearings installed after the initial start-off before the fuel switch, driven by the starter engine idling times, when the engine oil pressure gauge with a display and then turn on, turn the fuel switch, and placed in the low throttle position, start observe the engine running. Idle longer than 5min. After doing a new machine and overhaul the engine running-in period, long banned in the run-in period fierce surge in load reduction and high-speed mode of operation; engine after the end of a long work at full capacity, can not immediately stop, must allow the engine to upload speed operation can be shut down after 15min, or internal heat does not go out on the loose.
Strictly control the locomotive from the machine temperature, increasing the time from machine oil. In winter, in addition to strictly control the locomotive from the machine temperature, it should also increase the oil supply from the machine time to ensure that the engine oil reaches ministries friction, the maximum possible reduction of engine friction from the machine when the mixed friction. Oil filter replacement. When the oil filter before and after the pressure difference reaches 0.8MPa, that is to be replaced at the same time, to ensure that the effect of oil filtration, oil filter changed regularly to reduce the oil content of impurities.
Strengthening Oil Filter, crankcase ventilation cleaning and maintenance, according to the instructions require timely replacement of filters; ensure that the engine cooling system to work, good control of the engine's normal temperature, to prevent the radiator "boil", is strictly prohibited without the cooling water on the road ; the correct selection of fuel, accurate adjustment of the valve timing and ignition timing, etc., to prevent abnormal combustion engine: a timely manner and bearing crankshaft technical condition checks and adjustments.
    Regular oil Ferrography, reduce accidents, combined with oil Ferrography, early detection of abnormal wear, according to the oil Ferrography pattern accurately determine the abrasive component and the possible site and take preventive measures to avoid burning mill watts shaft accident.



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