Abstract
In the conventional system of lubrication, lubricating oil is renewed with fresh oil after it is used for some period. Accordingly, waste oil is generated in the conventional system.The authors have developed a new system that makes it possible to use lubricating oil semi-permanently without oil renewal. In the new system, therefore, no waste oil is generated and it is enough to supply only a small amount of fresh oil sometimes to compensate for the lost oil. The new system always keeps the lubricating oil clean as the kidney of animals always keeps their blood clean. This is why lubricating oil can be used semi-permanently and the new system is called kidney system. This system has been working well in about one thousand units of marine and cogeneration diesel engines in practice. Also, the new LO system improves reliability of engines. Expecting further higher reliability by combining the LO kidney system with an improved FO system, some engine tests were carried out and this paper firstly reports about the remarkably good effect of FO GEL breaker on engine reliability. Secondly, it reports that there were almost no troubles during 8000 hour running of a cogeneration diesel engine which was eguipped with (1) the LO kidney sy stem, (2) the improved FO system and (3) the fire ring to prevent gas blow-by between the piston and the cylinder. Lastly, the paper reports about the good results in some other cogeneration diesel engines eguipped with the LO kidney system.
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