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A three dimensional mathematical model has been developed to predict erosion in the engine internal surfaces. The model simulates the case of an engine operating in a dusty environment. The developed model relies on a modified version of KIVA-II code. Expressions for valves motion, instantaneous wall temperature and mutual interaction between the particles and the engine gas flow have been considered in this model. Erosion resulting from impinging particles on the engine internal surfaces has been predicted using the cutting and deformation model. Two approaches for the particles rebound behavior including both the deterministic and the stochastic approaches have been investigated. Also the effect of the presence of an oil film on the cylinder wall during the suction and compression strokes has been evaluated. This enabled the prediction of the engine oil contamination with particles.