The paper presents the results research related to the possibility of fuel injection pump diagnosis on the basis of
indicator diagram. The study was conducted on a laboratory four-stroke marine engine, type Sulzer 3Al 25/30, with
nominal power Nen = 408 kW at nominal rotational speed n = 750 rpm. The study was carried out according to active
experiment plan, during which the engine failure of the injection system was simulated. Simulation of fuel pump
leakage was completed by the opening of the adjusting screw on the pump discharge. Measurements were made at
a constant engine speed of 750 rev/min for five loads: 50, 100, 150, 200, 250 kW. Measurements of pressure of
combustion were performed by means of tensometric sensors of Spice Company. Based on measured pressure curves
heat release characteristics were determined. The algorithm allows the determination of net heat release rate q and
the net generated heat Q characteristics. Based on the obtained results it can be concluded that significant
improvement in the diagnostic use of indicator diagrams can be obtained by using heat release characteristics. These
characteristics are correlated with the process of fuel injection and the injection pump operation. As demonstrated in
the work of analyzing the heat release rate q, it is possible to infer diagnosis on the technical condition of the fuel
injection system.
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