The article discusses one of the most popular methods of diagnosing selected damages of marine piston engines,
which is the indication or measurement of pressure changes in the engine’s combustion chamber. Improving the
quality of indicator diagrams may contribute to the increase in the efficiency of using the parameters indicated in the
diagnostics of marine piston engines. Measurement errors during engine indication are primarily caused by
measuring channels that connect the combustion chamber to the pressure sensor. One way to avoid these errors is to
install the pressure sensor directly in the combustion chamber. It seems that it is possible to eliminate these errors.
However, there is a risk that the pressure sensor will be damaged by the effect of high temperature on it during
combustion of the fuel-air mixture in the engine’s combustion chamber. The article presents the results of tests that
indicate that the measured temperatures in the place where the sensor was installed (in the combustion chamber) did
not exceed the critical value specified by the pressure sensor manufacturer. The article also presents the results of
cylinder pressure measurement not only in the combustion chamber but also in two other points - on the thread of the
indicator cock and in the measuring channel between the indicator cock and the cylinder head. The tests were carried
out in a wide range of engine load technically efficient and with simulated damage in the fuel injection system. The
article presents a comparative analysis of the parameters read out of the indicator diagram for the three abovementioned pressure measurement locations. It was shown that the pressure measurements carried out directly in the
combustion chamber are free from errors resulting from the influence of measuring channels and indicator cock.
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