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Diesel engine bearings: ways to prevent burning
Source: China Bearing Network Time: 2014-08-05
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1 Strict measurement of the coaxiality and roundness of the main bearing bore of the diesel engine body. On the measurement of the coaxiality of the main bearing bore of the machine body; it is necessary to measure the coaxiality scale of the diesel engine body more accurately; together measure the runout of the crankshaft; The thickness of the optional bearing bush; the oil-running gap reaches the common position in each axial position. Where the diesel engine has been attacked by the rolling mill, the flying car, etc.; it is necessary to detect the coaxiality of the main bearing hole of the body before assembling; the full length of the ductile iron crankshaft Not more than 0. 14mm; the total length of the steel crankshaft is not more than 0. 12mm; together with the roundness of the body bearing hole; cylindricity is also required. If it exceeds the limit, it is disabled; if it is within the limit; then the grinding method is adopted (that is, in the bearing bush) The upper part is coated with excess red powder; after the crankshaft is loaded, the transformation is carried out; then the bearing cap is removed to view the bearing bush; after the hard spot protruding portion is scraped, the amount of change is measured; thereby ensuring the reliability of the application.
2 Improve the repair and equipment quality of the bearing; Strictly control the passing rate of the connecting rod on the connecting rod. Improve the hinge matching quality of the bearing; Ensure that the reverse lubrication of the bearing is not mottled; the positioning bump is intact, and the amount of the opening is 0. 5~1. 5mm; this ensures that the rear bearing bush of the device is tightly attached to the bearing housing hole by its own elastic force, and the parallel and degree of twisting of the new and old connecting rods are required; the unqualified connecting rod is stopped and mounted in the bearing housing. Each end of the upper and lower bearing bushes should be 30~50mm higher than the bearing seat plane; the high output can ensure the tight cooperation between the bearing and the bearing seat after tightening the bearing cap bolts according to the regular torque; the self-locking force of the conflict is satisfied; the bearing is not loosened. ; good heat dissipation; prevent bearing ablation and wear, the working surface of the bearing can not be reached by the scraping method to reach 75% ~ 85% touch impression; the joint gap between the bearing and the journal should be reached when not scraping In addition, the equipment should pay attention to the processing quality of the crankshaft journal and bearing; strictly implement the repairing process standard; prevent the equipment from being improper due to improper loading methods and the uneven torque of the bearing bolts or Together rule; and then attack flexion deformation stresses set; lead to early damage of the bearing.
Sampling the new bearing bushes, focusing on the thickness difference of the bearing bushes; and measuring the dimensions of the free opening; the appearance is tested for the quality of the outer surface. After the old bearing bushes with good condition are cleaned and tested, the original body, the original crankshaft, the original bearing bush, and the original position are implemented. Equipment utilization.
Ensure the diesel engine assembly and oil hygiene. Improve the function of the equipment, strictly remove the quality, improve the hygiene of all parts of the diesel engine. Together, purify the assembled site environment, manufacture the dust cover of the cylinder liner; make the diesel engine assembly has obvious hygiene progress.
3 Reasonably select and fill the lubricating oil. In the application process, the oil with small oil film surface tension should be selected; the impact of the oil flow will be reduced when the bubble formed is reduced. Stealing smoldering, smoldering, sorrowful, sorrowful, sorrowful, sorrowful, sturdy, sturdy, sturdy, sturdy, sturdy, sturdy Legu Weisong ç•šé”– 耄 耄 耄 北 北 北 北 北 北 北 北 芊庑Ч 芊庑Ч 芊庑Ч æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡ æ³¨é‡. The same quality, different viscosity grades and different types of lubricants are used to prevent mixing. The deposition time before the lubrication is usually not less than 48h.
4 Correctly use and protect the engine. When bearing the equipment; the surface of the shaft and the bearing should be coated with the regular brand of sanitary oil. After the engine bearing is installed, the fuel switch should be closed before the initial start; the engine is idling several times with the engine When the engine oil pressure gauge is displayed, turn the fuel switch on and off; and put the throttle in the middle and low speed position; start the engine to conduct the operation investigation. The idle operation time should not exceed 5 minutes. After the new machine and the overhaul engine after the running-in period In the running-in period, during the running-in period, the load is suddenly increased and the load is sharply increased and the operation is carried out under high speed. After the engine is fully loaded for a long time, it cannot be stopped immediately; it is necessary to let the engine run for 15 minutes under no-load medium and low speed; Otherwise the internal heat will not be able to escape.
Strictly control the starting temperature of the locomotive; add the starting oil supply time. In the winter, in addition to strictly control the starting temperature of the locomotive; also add the starting oil supply time to ensure that the oil reaches the conflict of the diesel engine; the maximum reduction of the diesel engine Mixing conflicts of conflicting sub-machines. Replacement of oil filter. When the pressure difference between the oil filter and the front reaches 0. 8MPa; that is, replace; together; to ensure the oil filtration; time to replace the oil filter Drop the impurity content in the oil.
Strengthen the sanitation and protection of the oil filter and crankcase ventilation equipment, replace the filter element in time according to the requirements of the manual, ensure the normal operation of the engine cooling system; control the normal temperature of the engine; prevent the radiator from “opening the potâ€; prohibit driving without adding cooling water. , the correct choice of fuel; precise adjustment of the gas phase and incineration timing; to prevent the engine from burning abnormally: timely view and adjustment of crankshaft and bearing skills.
Regularly analyze the iron spectrum of the oil, reduce the occurrence of the incident, contact the iron spectrum analysis of the oil, and detect the abnormal wear early; according to the iron spectrum analysis pattern of the oil, accurately determine the composition of the abrasive particles and the site of the attack; prevent the occurrence of the problem; prevent the occurrence of the burn Axis.
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