Description

The Cummins Piston Assembly 3908816 (1.00 mm oversize) is a high-quality replacement piston engineered for professional diesel engine rebuilds where significant cylinder wear or machining has occurred. This piston is a direct replacement for OE Cummins part number 3802769 , ensuring precise fitment, correct compression ratio, and long-term engine reliability. Designed specifically for Cummins diesel engines , this 1.00 mm oversize piston is ideal for applications requiring maximum material compensation after cylinder boring. It restores combustion efficiency, oil control, and power output while maintaining OEM performance standards. Manufactured from high-strength alloy materials, the piston features precision-cut ring lands, an optimized skirt profile, and excellent thermal resistance. These design elements help reduce friction, control piston expansion, and withstand extreme operating temperatures and combustion pressures common in heavy-duty diesel environments.