To a considerable extent the problem of lubrication connected with high-speed Diesel engines involves a study of the cause and effect of carbon and binder-forming depositions. For the purpose of this paper the problems of lubrication will be broken down into the following headings; (1) Influence of carbon and binder forming depositions on ring sticking, valve sticking, and lubricating-oil filter; (2) cylinder and ring scratching; and (3) bearings.

In breaking this subject into its related constituents, the influence of fuels and the combustion process is considered as distinct from the effect of piston-ring-belt temperatures.

This paper is to serve the purpose of illustrating the importance of cooperative research of engine manufacturers with the petroleum industry. The engine builder and the oil refiner serve a common customer, and his satisfaction is achieved as a result of the combined efforts of the two industries.

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