The purpose of this part is to reduce engine vibration and in many cases, serve as a pulley for drive belts.

The crankshaft is responsible for translating the engine's output into the type of motion needed to turn your wheels, but it creates a lot of vibration. The harmonic balancer attaches to the crankshaft and reduces vibrations to make your ride smoother.

Asked by Don Ayres · Last updated 5 years ago · 932.7K views · SOURCE