Replacement Cost Of Piston Rings While piston rings cost around $50 to $200, replacement cost of piston rings is more than $2000. This is because replacing piston rings is a laborious task. Although piston rings themselves doesn’t cost much themselves, the labor charges will be too high since piston rings replacement means taking out the engine cylinder head, removing piston from the engine, and then replacing the rings. http://www.wellfarengineparts.com/piston-ring/cummins-piston-ring/