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The crankshaft is one of the most important moving components of an internal combustion engine. It is responsible for transforming the oscillating piston movement into rotating movement by the connecting rods. During engine running, the crankshaft is submitted to axial, bending and torsional loads, which results in high stressed regions on the component. Due to the phased cylinder combustions, the crankshaft has high levels of torsion loads and the excessive torsional vibration is one of the main causes of failures in crankshafts and engine accessories, as pulleys, belts and gears. This paper presents an analytical method for previewing the crankshaft stresses by considering the component as simple a cylindrical shaft, applying the radial and the torsional loads on the crankpins and supporting at the main bearing positions.