3926631 Engine Piston

3926631 3971966 Engine Piston for Cummins 4B3.9 6B5.9,With main part numbers 3926631 and 3971966, this engine piston is a core power component for Cummins 4B3.9 and 6B5.9 engines. Made of high-strength aluminum alloy with high-temperature resistance and light weight, it can withstand high-pressure combustion and high-speed reciprocating motion inside the cylinder. Precision surface treatment and dimensional calibration ensure tight fit with the cylinder wall, reducing gas leakage and friction loss. It delivers stable power output, improves combustion efficiency, and is a reliable replacement part for engine power system overhaul and maintenance.