The Fifth Generation Diesel Engine Lubricating Oil with Multilevel for Railway Diesel Locomotive

Tentative technological indices for the developed fifth generation lubricating oil are determined according to the technical specifications for the fifth generation oil stipulated by Locomotive Maintenance Organizer Association(LMOA),GE Company and GM Company.Through a series of performance selections and evaluation tests,which include oxidation invariability test,bronze-steel friction and wear test,four-ball wear test,turntable lustration test and soot dispersion test,the composition of the fifth generation oil is fixed after many times of selections.L—38 bearing shell corrosion test and 1G2 high temperature lustration engine stand test are carried out.During 20 months field train operation test of DF_(4D) locomotive,physicochemical,infrared spectrographic,emission spectrographic and ferrographic analysis have been carried out for the fourth and fifth generation oils.The dynamic force unit of the diesel engine is taken apart and examined.Connecting rod bearing shell and piston ring are weighed.The lustration of piston is graded.Anti-oxidation,anti-abrasion and lustration dispersion performances of lubricating oil are reviewed synthetically.Train operation tests have validated that using the fifth generation oil can cut down the probability of soot accumulating in lubricating oil and reduce the speed of viscidity growth.Research results indicate that the developed fifth generation oil has better anti-oxidation,anti-abrasion and lustration dispersion performances.Viscidity growth is under control and prolongs the service life of lubricating oil.