The Cummins ISX 400 is a 6-cylinder turbocharged diesel engine producing 400 horsepower. Originally manufactured by Cummins, this engine has been widely used across2+ vehicle applications from 1 different vehicle manufacturers spanning model years 2015-2016. Popular vehicle makes include Freightliner.

Our remanufactured Cummins ISX 400 diesel engine long block undergoes a comprehensive rebuild process that meets or exceeds OEM specifications. Every engine is completely disassembled, thoroughly inspected, precision machined, and reassembled with new bearings, gaskets, seals, and critical wear components. The finished remanufactured ISX 400 long block is then pressure tested and quality verified before shipping.

US Engine Production has been remanufacturing Cummins diesel engines for over 45 years, making us one of the most experienced suppliers in the industry. Every remanufactured ISX 400diesel engine long block ships with a comprehensive 1-year unlimited mileage warranty and free shipping within the continental United States. We offer both long block and complete drop-in engine configurations to match your specific installation needs.

Whether you're replacing a failed engine in a commercial truck, construction equipment, or industrial application, our remanufactured Cummins ISX 400 delivers reliable performance at a fraction of the cost of a new engine. Call our diesel engine specialists at631-991-7700 for a personalized quote and expert guidance on selecting the right configuration for your vehicle.