Cummins 3901566 Connecting Rod Assembly

This connecting rod assembly replaces Cummins casting number 3901566. It is engineered for B Series engines including 4B, 6B, and ISB variants with 3.9L and 5.9L displacements. The rod features a machine-split cap design manufactured to OEM dimensional specifications for proper fit and function in heavy-duty diesel applications. Primary applications include Case IH Magnum series tractors (2096, 5120, 5130, 5140, 5240) equipped with the 6T-590 engine, as well as Case construction machinery such as 621B, 621C, 850G, and 1150G loaders and dozers. The component is constructed from forged steel for high fatigue strength and durability under severe operating conditions. Cross-references include Case OEM numbers J901566, J901567, and J942581.