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Internal combustion engines are commonly applied in vehicles and stationary equipment. They convert the energy contained in the fuel into mechanical work of the rotating crankshaft and, like all mechanical equipment, are subject to wear and tear and aging. The engine durability is described with design properties and, to a great extent, depends on the conditions of operation and the nature of the loads. As the engine degradation processes advance (variable temperatures, tribological processes, cavitation, chemical and electrochemical corrosion, aging etc.) the reliability and efficiency parameters deteriorate. As a consequence, the object wears, fails or is withdrawn from operation for economic or environmental reasons. Ever since the beginning of combustion engines, it has been observed that one of the key problems having impact on the engine operation is its correct adjustment. Degradation of the engine structure and engine incorrect adjustment may lead to the following phenomena in the internal combustion engine: deterioration of the engine efficiency, reduction of power, related to the reduction of mechanical efficiency, thermal efficiency and filling coefficient, increase in the emission of toxic compounds in the exhaust fumes, and possible damage to the engine components. Fig. 1a presents the differences in the fuel consumption for different valve clearance adjustments, and Fig. 1b presents the changes in the impact velocities of the valve against the valve seat allowing for the cam lift h). From the data shown in Fig. 1a, it follows that the changes in the valve clearance may lead to increased fuel consumption by the investigated internal combustion engine by approx. 9%, while the analysis of Fig. 1b leads to a conclusion that with the increasing valve clearance (lines: blue and green Fig.1b), the velocity of the impact of the valve against the valve seat grows, causing additional unwanted dynamic loads on the engine cylinder head of the engine. There are many methods of diagnosing the technical condition of combustion engines. They can be divided into methods utilizing Table 3. Steady state availability versus for Case 2

Engine valve clearance diagnostics based on vibration signals and machine learning methods