The Craftsman 530071491 Cylinder Crank Assembly supports the engine’s internal movement and helps convert combustion force into rotational power. Designed as a replacement cylinder crank assembly, it works with compatible engine components to support piston movement and crankshaft rotation during operation. Proper coordination between these components helps maintain consistent engine ... https://www.wholetoolbox.com/craftsman-530071491-cylinder-crank-assembly/530071491.html