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From the point of user it is important to minimize engine friction losses because it means the reduction in fuel consumption and emissions. Among all losses encountered during energy transformation a significant part relate to the friction in crank mechanism, in particular in bearing nodes. This paper presents results of calculation of averaged friction losses generated at the main and crank bearings of a diesel operating in a wide range of rotational speeds. A main bearing served as an examplefatcat:6g2j5nqmnzcmriu4mpr7rmsgde