Description

The Cummins Piston Ring Set R-3802258 (Standard Size) is an OEM-spec ring set designed to restore proper compression sealing, oil control, and combustion efficiency in Cummins 6CT 8.3 diesel engines . This ring set directly replaces Cummins OE part number 3802259 , ensuring factory-correct fitment and long-term reliability during engine rebuilds. Designed for STD bore cylinders , the R-3802258 ring set is commonly used with multiple 6CT 8.3 piston variants, including pistons identified by common crown markings such as 3163, 3165, 8749, 9564, and 9928 . Correct ring-to-piston compatibility is critical for maintaining proper compression ratio and combustion geometry. Manufactured from high-strength, wear-resistant materials, these piston rings are engineered to withstand high cylinder pressures, elevated operating temperatures, and continuous-duty service. Precision-machined ring profiles promote fast seating, uniform cylinder wall contact, reduced blow-by, and controlled oil consumption—key factors in extending engine life. The R-3802258 piston ring set is commonly installed during 6CT 8.3 engine rebuilds, in-frame overhauls, piston replacements, and professional remanufacturing projects . It is trusted by diesel technicians and engine builders who require OEM-level sealing performance and durability. Cross-Reference Aftermarket Reference: R-3802258 OEM Reference: 3802259 Size: Standard (STD) Engine Platform: Cummins 6CT 8.3 Application: Piston ring set