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The article presents the results of theoretical and operational studies of the dependence the internal combustion engine resource on changes in the physico-chemical properties of engine oil with a decrease in its volume in the crankcase. Comparative data on the performance indicators of standard diesel engines and experimental diesels in operation equipped with a device for maintaining the standard oil level in the crankcase are presented. The proposed built-in device for maintaining the standard level of oil in the crankcase diesel engine makes it possible to reduce material costs for ensuring its performance and increase the resource of use. [ABSTRACT FROM AUTHOR]

A method for evaluating the frequency of engine oil replacement and diagnostics of internal combustion engine elements by the parameters of the crankcase oil during operation is considered. Theoretical and experimental substantiations of the maximum diagnostic parameters of the volume, viscosity, base number and flash point of the engine crankcase oil are given. The optimal frequency and algorithm for analyzing the parameters of crankcase oil for the element-by-element diagnostics of internal combustion engine systems and mechanisms are determined. The proposed method of diagnosing the internal combustion engine by the parameters of the crankcase oil allows reducing the material and labor costs to ensure its operability. [ABSTRACT FROM AUTHOR]