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Diesel engines are widely used in the world for trade and human transportation because of their efficiency and economical aspects. Approximately thirty percent of the greenhouse gases that cause global warming in the world are due to the transportation sector. The purpose of this study is to examine the effect of four-stroke single-cylinder diesel engine on combustion characteristics and exhaust gas emissions by changing intake valve lift distances. Combustion analysis and visualisation of analysis results at different valve lift values were applied with ANSYS-Forte, which is a commercial software, using computational fluid dynamics (CFD) for combustion system analysis and ANSYS-Chemkin which is used for reaction kinetics of combustion. Numerical results are shown that CO, CO2, NO, NO2 emissions, pressure and temperature with respect to crank angle. Numerical analysis results were compared with previous experimental data and parametric studies were applied based on verified model. The cylinder pressure and temperature values were found to be parallel with the data examined in the literature. The current study found that gross indicated power, indicated main effective pressure (IMEP) and combustion efficiency increase with the valve lift extension