Crankshaft

The crankshaft is a key component of internal combustion engines, located in the crankcase at the bottom of the engine. The crankshaft converts the linear, up-and-down motion of the pistons in the engine's cylinders into rotational motion. The pistons are connected to the crankshaft by connecting rods. The rotational motion transmits energy to the vehicle's drivetrain, which ultimately drives the wheels. It has counterweights to reduce vibration caused by the motion. To minimize friction and ensure smooth rotation, the crankshaft rests on bearings.

As it is a highly stressed part, it is usually made of forged or cast iron to withstand high mechanical loads.

The crankshaft is a fundamental component, and its failure may require significant engine repair or even replacement.