Description

The Cummins Aluminum Piston Assembly M-0187-100 (1.00 mm Oversize) is a precision-engineered replacement piston designed for diesel engines that have undergone significant cylinder boring during professional rebuilds. This piston assembly directly replaces Cummins OE part number 3802238 , ensuring OEM-accurate fitment, correct compression height, and reliable combustion performance. Engineered for Cummins diesel engines , the high-strength aluminum alloy construction offers excellent heat dissipation, reduced reciprocating mass, and smooth engine operation. Aluminum pistons are well suited for applications where balanced thermal expansion, fuel efficiency, and dependable durability are required. The 1.00 mm oversize specification restores proper piston-to-cylinder clearance in heavily bored cylinders, helping maintain compression, oil control, and overall engine efficiency. Precision-machined ring lands and an optimized skirt profile reduce friction, minimize piston slap, and promote long service life under continuous operating conditions. The Cummins M-0187-100 aluminum piston is commonly installed during full engine rebuilds, in-frame overhauls, and professional remanufacturing projects . It is trusted by diesel technicians, fleet maintenance teams, and engine builders seeking OEM-style performance and long-term reliability.