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The components attached to the crankshaft of an internal combustion engine are under variable cyclic loads due to the engine cycle, combustion forces and pistons and conrods reciprocating movements, and the description of the forces is important to the right development of rotating components. The multi-body method is largely used in the automotive industry to obtain loads where dynamic effects are involved. The high costs and difficulty involved in obtaining experimental data of this kind of loads are the main reason of using this method. This way, the multi-body method is an important tool in the project of rotating components. The objective of this work is to show a calculation methodology using the multi-body method to obtain the stresses on a diesel engine radiator fan bracket under the crankshaft torsional vibration and other acting loads.