What is crank shaft runout?

Crankshaft runout refers to the deviation of the crankshaft's rotational axis from its true centerline when it is rotated. This misalignment can lead to uneven wear, vibrations, and potential engine performance issues. It is typically measured using a dial indicator and should be within specified tolerances to ensure proper engine operation. Excessive runout may necessitate repairs or replacement of the crankshaft.