Counterbalance or harmonic balancer of some sort, by necessity heavier on the one side, which is keyed to be sure it's placed correctly to prevent an engine from shaking like crazy. Often on the opposite side of the engine from the flywheel.
Counterbalance or harmonic balancer of some sort, by necessity heavier on the one side, which is keyed to be sure it's placed correctly to prevent an engine from shaking like crazy. Often on the opposite side of the engine from the flywheel.