Description

Piston Assembly Piston Ring Set R-5258754 STD 5258758 The Cummins Piston Ring Set R-5258754 (Standard Size) is an OEM-spec ring set engineered to restore proper compression sealing, oil control, and combustion efficiency in Cummins diesel engines . This ring set directly replaces Cummins OE part number 5258758 , ensuring factory-correct fitment and long-term reliability. Designed for STD bore pistons , the R-5258754 ring set is commonly paired with steel crown piston assemblies using OE references 5258754 / 5258755 . Precision-machined ring profiles promote fast seating, uniform cylinder wall contact, reduced blow-by, and controlled oil consumption—critical for high-load and emissions-controlled diesel applications. Manufactured from high-strength, wear-resistant materials, these piston rings are built to withstand extreme combustion pressures and elevated operating temperatures. Consistent ring tension and accurate geometry help maintain compression ratios, protect cylinder walls, and extend overall engine service life. The R-5258754 piston ring set is typically installed during engine rebuilds, in-frame overhauls, piston replacements, and professional remanufacturing projects . It is trusted by diesel technicians, fleet maintenance teams, and engine builders who require OEM-level sealing performance. Cross-Reference Aftermarket Reference: R-5258754 OEM Reference: 5258758 Size: Standard (STD) Application: Piston ring set for steel crown pistons