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Kazimierz Witkowski Akademia Morska w Gdyni Wydział Mechaniczny Katedra Siłowni Okrętowych 81-125 Gdynia, ul. Morska 83 e-mail: wika@am.gdynia.pl DIAGNOSIS OF INJECTION SYSTEM MARINE DIESEL ENGINE WITH THE USE OF THE HEAT RELEASE CHARACTERISTICS Abstract The paper presents the issues related to the diagnosis of injection system marine diesel engines, which are characterized by high unreliability. It was supported by the statistics of emergency events marine engines. It has been shown that the not only parameters of the diesel engine depends on the reliable operation of injection equipment but also the safety of navigation. This indicates the importance of diagnostics injection system, giving the ability to detect defects at the early stage of their development, in order to avoid failure. This has been demonstrated on the example of the injection system leak detection. The article discusses the possibility of using in the heat release characteristics calculated based on the indicator diagram in the marine engine injection system diagnostics. The research was conducted in the laboratory on a stand with the marine engine SULZER type 3AL25 / 30, loaded with the self-excited synchronous generator GD8-500-50 type. The stand also includes a central computer the system measurement and registration of the parameters this diesel engine. It has been shown that the characteristics of heat release contain information about the condition of the injection systems, which enable to diagnose their failures. The obtained results allowed to select the diagnosis symptoms, useful in detecting faults in the injection system, from the characteristics of heat release. Keywords: diagnosis, piston marine diesel engine, injection system, statistics damage, heat release characteristics, net of heat release characteristics, the intensity of the heat release.