Measurements on commercial and experimental cylinder oils with alkalinity levels ranging from 70 to 100 Total Base Numbers have determined the effect of various friction modifiers and detergent combinations on scuffing prevention and the reduction of cylinder wear. The test results clearly indicate that drastic increases in alkalinity alone are not the best way to lower cylinder wear rates. The results obtained with the accelerated wear testing technique aboard the M/S Mobil Engineer are compared with the results of conventional proof of performance tests from ships powered by crosshead diesel engines. Experiments conducted aboard a company vessel powered by a 12000 BHP Sulzer 6RND76 crosshead diesel engine indicate that a unique array of cylinder liner sensors can be used in combination with the collection of spent scrape-down cylinder oil to continuously monitor the wear performance of diesel cylinder oils. The system provides a sensitive continuous record of the wear and lubricating conditions at the piston, ring and liner contact. Information is also obtained to insure that the lubricating conditions have been uniform throughout a series of cylinder oil wear tests. Measurements using different cylinder oils have determined the influence of various detergent combinations on the reduction of cylinder wear. Significant improvements in antiwear protection were obtained using an 80 TBN cylinder oil formulation containing an optimum combination of metallic and non-metallic detergent additives as well as special friction modifiers. Since field experience with very high ash cylinder oils has shown the possibility of abrasion and deposit formation is greater when the engine is operated with poor combustion or marginal quality fuels, the authors believe this is a more practical approach than drastically increasing the oil alkalinity to an even higher level.
Development of antiwear cylinder oil for high output crosshead diesels
Entwicklung eines verschleißmindernden Öls für Hochleistungs-Kreuzkopf-Dieselmotoren
1977
43 Seiten, 38 Bilder, 7 Tabellen, 9 Quellen
Conference paper
Storage medium
English
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