Description

The Cummins Piston Assembly 3908815 (0.50 mm oversize) is a premium-quality replacement piston designed for precision engine rebuilds where cylinder boring has been performed. This piston directly replaces OE Cummins part number 3802768 and is manufactured to meet or exceed OEM specifications for performance, durability, and fitment. Engineered for use in Cummins diesel engines , this 0.50 mm oversize piston is ideal for engines that require material compensation due to cylinder wear or damage. It restores proper compression ratios, combustion efficiency, and oil control, ensuring reliable engine operation under heavy-duty conditions. Constructed from high-strength alloy materials, the piston features precision-machined ring grooves, optimized skirt geometry, and excellent thermal stability. These design characteristics help reduce piston slap, minimize friction, and withstand extreme combustion pressures commonly found in commercial diesel applications.