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The paper describes various types of deposits of injectors used in CI engines with direct and indirect fuel injection. Various factors have been determined which affect the formation and size of deposits. These factors have also been classified and evaluated in terms of their impact on the formation of deposits precursors and further changes of deposits during the engine life. The results of deposits formation tests have been presented. The external and internal deposits in the High Pressure Common Rail fuel injection systems have been photographed and described. The impact of formed deposits on the diagnostic parameters of injectors has been discussed broadly as it determines the range of injectors’ dysfunction and their fit for further use.

A study of factors influencing the formation of harmful deposits in the diesel engine injectors