Crankshaft is one of the critical components for the effective and precise working of the internal combustion engine. In this
paper a dynamic simulation is conducted on a crankshaft from a single cylinder 4- stroke diesel engine. A three-dimension
model of diesel engine crankshaft is created using SOLID WORKS software. Finite element analysis (FEA) is performed to
obtain the variation of stress magnitude at critical locations of crankshaft. Simulation inputs are taken from the engine
specification chart. The dynamic analysis is done using FEA Software ANSYS which resulted in the load spectrum applied
to crank pin bearing. This load is applied to the FE model in ANSYS, and boundary conditions are applied according to the
engine mounting conditions. The analysis is done for finding critical location in crankshaft. Stress variation over the engine
cycle and the effect of torsion and bending load in the analysis are investigated. Von-mises stress is calculated using
theoretically and FEA software ANSYS. The relationship between the frequency and the vibration modal is explained by the
modal and harmonic analysis of crankshaft using FEA software ANSYS.