Description

The Cummins Steel Crown Piston Assembly M-7416 (Standard Size) is a heavy-duty piston solution engineered for durability, thermal stability, and long service life in Cummins diesel engines . Featuring a steel crown (steel top) design, this piston assembly directly replaces Cummins OE part numbers 3926631 and 3926632 , ensuring OEM-accurate fitment, compression height, and combustion performance. Steel crown pistons are specifically designed to handle extreme combustion temperatures and high cylinder pressures common in modern and heavy-load diesel applications. Compared to traditional aluminum pistons, the steel crown construction offers superior resistance to heat fatigue, cracking, and erosion, making it ideal for severe-duty, high-hour, and fleet-operated engines. The M-7416 piston assembly features precision-machined ring lands, an optimized skirt profile, and a robust internal structure that promotes piston stability, reduced friction, and consistent performance. The standard-size configuration is intended for engines with cylinders within OEM specifications, eliminating the need for oversize machining. This steel crown piston assembly is commonly used during full engine rebuilds, in-frame overhauls, and professional remanufacturing projects . It is trusted by diesel engine builders, fleet maintenance teams, and repair facilities that demand reliability under extreme operating conditions.