Description

The Cummins Piston Ring Set R-5258754 (Standard Size) is an OEM-spec ring set designed to restore compression sealing, oil control, and combustion efficiency in modern Cummins diesel engines . This ring set directly replaces Cummins OE part number 5258758 , ensuring precise fitment and long service life. Engineered for STD bore pistons , the R-5258754 ring set is commonly paired with steel crown pistons using OE references 5258754 and 5258755 , including ISB common rail, CM2350, and related Cummins platforms. Correct ring-to-piston matching is critical to maintaining factory compression ratios, preventing blow-by, and controlling oil consumption. Manufactured from high-strength, wear-resistant materials, these piston rings are built to withstand high cylinder pressures, elevated combustion temperatures, and continuous-duty operation . Precision-machined ring profiles promote fast break-in, uniform cylinder wall contact, and stable oil film control, helping extend overall engine life. The Cummins R-5258754 piston ring set is commonly installed during engine rebuilds, in-frame overhauls, piston replacements, and professional remanufacturing projects . It is trusted by diesel technicians, fleet operators, and engine builders who require OEM-level sealing performance. Cross-Reference & Fitment Aftermarket Reference: R-5258754 OEM Reference: 5258758 Size: Standard (STD) Application: Piston ring set Common Pairing: Pistons 5258754 / 5258755