Cummins 4941396 Piston Crown Assembly

The Cummins 4941396 piston crown is a critical component of the split piston assembly used in QSL9, ISL, and QSL 8.9-liter diesel engines. This articulated piston design separates the crown from the skirt to reduce thermal stress and improve durability under high cylinder pressures common in heavy-duty applications. Manufactured to OEM specifications, the piston crown features a steel construction with high-temperature oxidation resistance and bainitic microstructure for extended service life. It interfaces with piston skirt part number 3966721 to form the complete piston assembly kit 4955237. The crown incorporates the combustion bowl geometry optimized for the HPCR fuel system and CM850 electronic control module found in these engine platforms. Cross-reference interchangeability includes Cummins part numbers 4934266, 4940794, 4955237, and 4932721. Applications span construction machinery, agricultural equipment, marine propulsion, and on-highway trucking platforms equipped with the 8.9L engine family.