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The obtained approximate analytical dependences on the calculation of temperature fields in the processed part during finishing and strengthening electro-mechanical processing allow us to predict the properties of the surface layer and assign processing modes based on the characteristics of operation.

The authors of the article carried out the analysis of the failure causes of diesel engine types 4Ч 110/125 and 4ЧН 110/125. As a result of this analysis it was found that the highest percentage of failures occurred in the high-pressure fuel pump and nozzle. The procedure of the electric cleaning process of diesel fuel in an electric field is also considered in the article. A mathematical model of the electric cleaning process of diesel fuel in an electric field has been obtained and the boundaries of the initial parameters of the electric field have been determined.