The BRIGGS & STRATTON 84004523 Engine Crankshaft transfers the engine’s rotating motion to support smooth and consistent power delivery. It works by converting the piston’s up-and-down movement into rotational force, allowing the engine to operate and drive connected components. Replacing a worn or damaged crankshaft can help restore proper engine operation and maintain reliable perfo... https://www.wholetoolbox.com/briggs-stratton-84004523-engine-crankshaft/84004523.html