Cummins Remanufactured Diesel Engines
ISX, ISB, N14, 6.7L & Heavy-Duty Diesels
US Engine Production specializes in remanufactured Cummins diesel engines for pickup trucks, semi-trucks, and industrial equipment. From the popular 6.7L in Ram trucks to the legendary N14 and modern ISX for Class 8 trucks, we have your Cummins engine.
Popular Cummins Engines
6.7L Cummins
Ram 2500/3500 diesel
5.9L Cummins 12V
Classic Ram diesel (1989-1998)
5.9L Cummins 24V
Ram diesel (1998-2007)
ISX 15.0L
Class 8 semi-truck diesel
ISB 6.7L
Medium-duty truck diesel
N14
Legendary heavy-duty diesel
ISC 8.3L
Medium-duty applications
ISL 8.9L
Vocational truck diesel
ISM 10.8L
Heavy-duty truck diesel
Cummins Engine Specifications
| Engine | Displacement | Config | Horsepower | Torque | Applications |
|---|---|---|---|---|---|
| 6.7L Cummins (Ram) | 6.7L | I6 | 370-420 hp | 850-1,075 lb-ft | Ram 2500, Ram 3500, Ram 4500, Ram 5500 |
| 5.9L 12-Valve | 5.9L | I6 | 160-215 hp | 400-440 lb-ft | Ram 2500, Ram 3500 (1989-1998) |
| 5.9L 24-Valve | 5.9L | I6 | 235-325 hp | 460-610 lb-ft | Ram 2500, Ram 3500 (1998-2007) |
| ISX 15 | 15.0L | I6 | 400-600 hp | 1,450-2,050 lb-ft | Peterbilt, Kenworth, Freightliner, International |
| N14 | 14.0L | I6 | 310-525 hp | 1,250-1,650 lb-ft | Peterbilt, Kenworth, Freightliner |
| ISB 6.7 | 6.7L | I6 | 200-325 hp | 520-750 lb-ft | Medium-duty trucks, school buses |
| ISL 8.9 | 8.9L | I6 | 260-380 hp | 660-1,150 lb-ft | Vocational trucks, motorhomes |
About Cummins Engines
Cummins Inc. has been a leader in diesel engine technology since 1919. Their engines power everything from Ram pickup trucks to Peterbilt and Kenworth semi-trucks. The ISX series has become the most popular heavy-duty diesel in North America, while the 6.7L Cummins in Ram trucks is renowned for its torque and reliability.
Founded by Clessie Cummins in Columbus, Indiana, Cummins Inc. grew from a small diesel engine company into a global powerhouse. The company's breakthrough came with the NH series engines in the 1960s, followed by the legendary N14 in 1988 — an engine so reliable that many are still running with over a million miles. The ISX (Interact System X), introduced in 1998, replaced the N14 and became the dominant Class 8 truck engine in North America, powering Peterbilt, Kenworth, Freightliner, and International trucks. In 1989, Cummins partnered with Dodge to put the 5.9L 6BT diesel in the Ram pickup, creating the most iconic diesel pickup truck combination in history. The 6.7L Cummins, introduced in 2007, continues this legacy with up to 420 hp and 1,075 lb-ft of torque. Cummins also produces the ISB, ISC, ISL, and ISM series for medium-duty applications, making them the most comprehensive diesel engine manufacturer in the world.
Cummins Engine Buying Guide
When purchasing a remanufactured Cummins engine, the most critical factor is identifying the correct CPL (Control Parts List) or ESN (Engine Serial Number). Cummins uses these numbers to track the exact configuration of each engine, including horsepower rating, emissions certification level, and accessory drive layout. For Ram truck applications, the 5.9L comes in 12-valve (mechanical injection, 1989-1998) and 24-valve (electronic injection, 1998-2007) variants that are not interchangeable. The 6.7L has evolved through multiple emissions tiers, so matching the model year is essential. For Class 8 applications, the ISX comes in EGR and non-EGR configurations, with horsepower ratings from 400 to 600 hp. Always provide your VIN or ESN when requesting a quote to ensure a perfect match.
Cummins Diesel Engine Series
Explore each Cummins engine series in detail — specs, common issues, compatible vehicles, and pricing for remanufactured engines.