Piston Ring Set 4.055 Moly 3.0 2.0 3.0mm

The MAHLE ORIGINAL Piston Ring Set 4.055 Moly 3.0 2.0 3.0mm (SKU M7741909) is a premium-grade replacement piston ring kit engineered for diesel engines requiring precision-fit components. This 8-cylinder piston ring set delivers the plasma moly coating and ductile iron construction that modern diesel engines demand, providing superior ring-to-bore sealing and extended service life in high-compression combustion environments.

Designed as a drop-in replacement for 4.055-inch bore diesel applications, this piston ring kit features standard tension specifications and a three-ring configuration: 3.0mm compression ring, 2.0mm compression ring, and 3.0mm oil control ring. The plasma moly coating reduces friction at the ring-bore interface while protecting against scuffing and wear during cold starts and sustained high-load operation. Ductile iron construction provides the strength necessary to contain combustion pressure without brittleness or premature failure. These specifications ensure proper blowby control, oil consumption regulation, and cylinder wall protection across the complete engine lifecycle.

This piston ring set is intended for engine rebuilds, complete overhauls, and replacement of worn ring sets in diesel-powered equipment including industrial generators, agricultural machinery, marine powerplants, and commercial vehicles. Technicians and rebuilders rely on MAHLE's OEM-equivalent quality to restore compression, reduce emissions, and eliminate oil burning in aging diesel engines. The kit arrives ready for installation without additional processing, though proper ring end gap verification and honing procedures should precede assembly.