The McCormick 3656910M1 is a genuine OEM piston ring designed for Perkins 1004 and 1006 series engines. This essential engine component features a 100mm bore, 2.38mm thickness, and 3.00mm height, ensuring optimal engine performance and sealing. It is compatible with a wide range of Massey Ferguson, Landini, and McCormick agricultural machinery, including various series of tractors. This high-quality piston ring maintains engine compression and reduces oil consumption, making it a critical part for engine overhaul and maintenance.