Description

Cummins Piston Assembly 3907156 The Cummins Piston Assembly 3907156 (STD) is a precision-engineered diesel piston designed to meet strict OEM performance, durability, and combustion efficiency standards . This piston is a direct replacement for Cummins OEM part number 3802758 , making it an ideal choice for professional engine rebuilds, overhauls, and reliability-focused repairs. Manufactured from high-strength aluminum alloy , this standard-size piston is built to withstand high combustion pressures and elevated operating temperatures common in Cummins diesel engines. The optimized piston crown supports efficient fuel combustion, while the reinforced skirt design helps reduce piston slap, scuffing, and uneven wear during extended service life. Engineered for accurate compression ratios, proper piston ring seating, and smooth engine operation , this piston assembly helps restore factory-level engine performance and fuel efficiency. It is commonly used in heavy-duty and turbocharged diesel applications , including on-highway trucks, industrial equipment, and off-highway machinery. Whether you are completing a full engine overhaul or replacing a worn or damaged piston , the Cummins 3907156 STD piston delivers OEM-level fitment, reliability, and long-term durability trusted by diesel professionals worldwide.