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Correct operation of the internal combustion engine requires the best possible seal of the combustion chamber during the period when the valves are closed. A perfect seal of the combustion chamber can not be achieved because of the constructional features of the segments as well as the play between the piston and the cylinder. In time, the wear of moving parts leads to a continuous worsening of the seal. Different complexity and accuracy methods are used to measure the combustion chamber's leakage. In this article, the following methods of measuring the engine cylinder leakage are presented: measuring the pressure in the cylinder at the end of the compression process using a compression gauge, measuring the current drawn by the starter motor, comparing engine speeds when the engine is cranked over by the starter and comparing engine speeds on idle. The paper presents the comparative analysis of the values obtained by different methods with the cold engine compared to the hot engine and a comparative analysis between the results obtained by using the different methods of measuring the engine cylinder leakage. The paper demonstrates that measuring the pressure using a compression gauge is the most accurate method for determining the leakage of the combustion chamber.

combustion chamber; diagnostics; compression tests; quantitative compression