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Contact dynamic characteristics of an internal combustion engine structure were studied by the finite element method and experimental verification. Based on theoretical analysis, contact modal calculation of an internal-combustion engine with finite element method is carried out by the ADINA software. Dynamic behavior of the entire engine structure was investigated. Rigid bar connection and coupling connection were introduced for the purpose of comparison with contact analysis and experiment results. The experimental results are in good agreement with the theoretical analysis and FEM results. From the study, it can be demonstrated that dynamic behavior of the engine structure with a large preload shows linear characteristics. Compared with the other models, the procedure presented in this paper is more effective and useful in view of operational time and experience of analysts.