Sliding bearing early damage is more common than bearing burning, so to prevent sliding bearing early damage is very important.The correct maintenance of the sliding bearing is an effective way to reduce early bearing damage, and prolong the life of the bearing of the insurance certificate.Therefore, in the daily maintenance and repair of the engine, must pay attention to the bearing surface of the alloy, the back end and the appearance of edge angles in shape, if there is any abnormal or half signs of wear and tear, to seriously investigate the cause, and take appropriate measures to improve the bearing of the working conditions, pay much attention to the prevention of early damage of the sliding bearing. (1) strictly diesel engine body main bearing hole alignment and roundness measurement.For the body main bearing hole alignment measurements, must be measured by the engine block size more precise alignment, measuring the crankshaft beat at the same time, to choose the thickness of the bearing shell, make the oil clearance in the shaft to achieve consistently.All that happened in watts, diesel engine speed, and so on and so forth, before the assembly must be tested to the body main bearing hole alignment, ductile iron crankshaft length is not greater than 0.14 mm, length is not greater than 0.12 mm steel crankshaft, at the same time for the body bearing hole of the roundness, cylindricity also have requirements.Exceeds limit such as disabled, if within the limit, the grinding method (namely on the bearing shell coated with optimum amount of red lead powder, after loading the crankshaft rotation, and then remove the bearing cover inspection on bearing shell, hard point projection area of scraping and processing, measuring the size of the change, to ensure the reliability of the use. (2) improve the quality of bearing maintenance and assembly, strict control of connecting rod on the percent of pass.Improve the quality of bearing hinge distribution, to ensure smooth and no spots on the back of the bearing, positioning bumps intact;Own bounce off amount was 0.5 ~ 1.5 mm, this guarantees that after assembly bearing with the aid of its elasticity and bearing hole joint closely;All requirements of the new and old connecting rod measuring the parallelism and the degree of distortion, ban on of unqualified connecting rod;In a bearing seat within the upper and lower two pieces of each end bearing shall be higher than that of bearing seat plane 30 ~ 50 mm, higher quantity can ensure torque tighten bearing cap bolts according to regulations after the bearing and the bearing seat close coordination, have enough force of friction self-locking, bearing is not loose, good heat dissipation effect, and prevent bearing ablation and wear;Bearing of the working face can't scrape match method reached 75% ~ 85% contact pattern as a measure, should be not scraping makes fitting clearance of bearing and shaft neck up to par.Besides, when the assembly should pay attention to check the machining quality of the crankshaft journal and bearing, strictly implement repair process specification and prevent the installation is not straight caused by improper loading method and uneven bearing bolt torque or do not conform to the regulations, resulting in a bending deformation and stress concentration, lead to early damage of the bearing. To purchase new bearing for checking.Difference of the thickness of the bearing shell, and free opening size measurement, surface testing its surface quality.Evaluate the cleaning in the state of good old bearing shell, execute the original body, the original crankshaft, the original bearings, in-situ assembly use. To ensure the purity of the engine assembly and oil.Improve the performance of cleaning equipment, strict quality management to cleaning, to improve cleanness of diesel engine parts.At the same time, environment purification assembly site, make cylinder liner dust cover, make the diesel engine assembly cleanliness has increased significantly. (3) selection and filling lubricating oil reasonably.In use process want to choose the lubricating oil, the oil film surface tension small, make the formation of air bubbles breaking the corresponding impact of oil flow is reduced, the bearing can effectively prevent cavitation;Lubricating oil viscosity grade, not increased at lest increase bearing coking tendency;Engine oil level of lubricating oil must be within the scope of the standard, lubricating oil and gas with tools must be clean and prevent the entry of any dirt and water, at the same time ensure that the sealing effect of the various parts of the engine.Pay attention to the regular inspection and replacement lubricating oil;Place for filling lubricating oil should be no pollution, no dust, prevent the intrusion of all pollutants;Different quality, different level and use different types of lubricant viscosity Forbidden to mix, lubricating oil filling the settling time before the general should not be less than 48 h. (4) the correct use and maintenance of the engine.When installing bearings, should be in the movement of shaft and bearing surface coated with grades clean engine oil.After refitted engine bearing, before starting the first should be shut off fuel switch, use the starter machine machine idling for several times, when the engine oil pressure gauge, open the fuel to switch, after I have a show and put gas in low speed, start the engine running.Idle running time is not more than 5 min.Make new and big after repairing the engine break-in period, the period prohibited in vastly decrease in load and high speed for a long time work under the state;End of the engine full load for a long time after work, can't stop immediately, must let the engine to idle after 15 min in a low speed to stop, or internal heat is not to go out. Strictly control the locomotive starting temperature, increase the machine delivery time.In winter, in addition to the strict control of locomotive starting temperature, fuel supply time should add up the machine, to ensure the oil to the various parts of the diesel engine friction pair, can reduce wood oil machine to machine the friction pair of mixed friction.Oil filter replacement.When the pressure difference before and after the oil filter at 0.8 MPa, namely for replacement, at the same time, in order to ensure the filtration effect of oil, oil change qing filter regularly, reduce the impurity content in the oil. Strengthen the oil filter, crankcase ventilation equipment cleaning and maintenance, according to the specifications timely replacement filter;Guarantee the normal work of the engine cooling system, control the engine to normal temperature, prevent radiator "boiled", yan Banned driving without cooling water;Correct use fuel, accurately adjust with gas phase and the ignition timing and so on, to prevent abnormal combustion engines: to have the condition of crankshaft and bearing technology inspection and adjustment work. Oil iron spectrum analysis on a regular basis, reduce the accident, combined with the oil iron spectrum analysis, early detection abnormal wear, according to the oil pattern of iron spectral analysis, accurate determination of abrasive components and parts may occur, nip in the bud, to avoid grinding burn axis accident.