Product Description
Cummins N855 NTA855-DM Original Engine for Marine is a 14-liter turbocharged and aftercooled diesel engine, purpose-built for marine applications. Recognized for its outstanding reliability and fuel efficiency, the NTA855-DM provides dependable power for both propulsion systems and auxiliary equipment onboard. With robust engineering and proven performance in harsh marine environments, it is a trusted solution for ship operators seeking long service life and low operating costs.
Cummins NTA855-DM321 Technical Data Sheet
| Item | Value |
| Engine Model | NTA855-DM321 |
| No. of Cylinders / Arrangement | 6 / In-line |
| Cycle | 4-Stroke |
| Air intake method | Turbocharged & Aftercooled |
| Displacement | 14L |
| Bore × Stroke | 140 × 152 |
| Compression Ratio | 14.5:1 |
| Fuel System | PT (Pressure-Time) Fuel System |
| Governor Type | Electronic |
| Rated Power | 321 HP / 240 kW |
| Rated Speed | 1800 |
| Max. Torque | 1384 |
| Idle Speed Range | 700–1000 |
| Cooling System | Water-cooled (indirect) |
| Lube Oil Capacity | 36–38 |
| Net Weight | 1270 |
| Dimensions (L×W×H) | 1600 × 850 × 1425 |
| Rotation (Flywheel end) | Clockwise |
| Emission Standard | Marine, Non-certified |
| Typical Applications | Marine Auxiliary, Marine Main Propulsion |
Cummins NTA855-DM Series Key Specifications Comparison
| Parameter | NTA855-DM270 | NTA855-DM290 | NTA855-DM300 | NTA855-DM320 | NTA855-DM321 | NTA855-DM350 |
| Rated Power (HP/kW) | 270 / 201 | 290 / 216 | 300 / 224 | 320 / 239 | 321 / 240 | 350 / 261 |
| Rated Speed (RPM) | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 |
| Displacement (L) | 14 | 14 | 14 | 14 | 14 | 14 |
| No. of Cylinders / Layout | 6 / In-line | 6 / In-line | 6 / In-line | 6 / In-line | 6 / In-line | 6 / In-line |
| Bore × Stroke (mm) | 140 × 152 | 140 × 152 | 140 × 152 | 140 × 152 | 140 × 152 | 140 × 152 |
| Compression Ratio | 14.5:1 | 14.5:1 | 14.5:1 | 14.5:1 | 14.5:1 | 14.5:1 |
| Air intake method | Turbocharged & Aftercooled | Turbocharged & Aftercooled | Turbocharged & Aftercooled | Turbocharged & Aftercooled | Turbocharged & Aftercooled | Turbocharged & Aftercooled |
| Cooling System | Water-cooled (indirect) | Water-cooled (indirect) | Water-cooled (indirect) | Water-cooled (indirect) | Water-cooled (indirect) | Water-cooled (indirect) |
| Fuel System | PT Fuel System | PT Fuel System | PT Fuel System | PT Fuel System | PT Fuel System | PT Fuel System |
| Governor Type | Electronic or Mechanical | Electronic or Mechanical | Electronic or Mechanical | Electronic or Mechanical | Electronic or Mechanical | Electronic or Mechanical |
| Net Weight (kg) | 1260 | 1270 | 1270 | 1270 | 1270 | 1270 |
| Dimensions (mm) | 1600×850×1425 | 1600×850×1425 | 1600×850×1425 | 1600×850×1425 | 1600×850×1425 | 1600×850×1425 |
| Applications | Marine Auxiliary, Marine Main Propulsion | |||||
Features & Benefits
- Marine-Optimized Design – Engineered specifically for vessel propulsion and onboard auxiliary power.
- Fuel-Efficient Performance – Delivers excellent fuel economy without compromising reliability.
- Durable in Harsh Conditions – Built with marine-grade materials to withstand saltwater and continuous operation.
- Compact & Versatile – Provides high output in a manageable size, ideal for various marine installations.
- Low Vibration & Noise – Enhances comfort and safety for crew during long voyages.
Typical Applications
- Marine propulsion systems for commercial and working vessels
- Shipboard auxiliary engines
- Marine generator sets for onboard power
- Deck machinery and marine pumping equipment
- Offshore support vessels and coastal transport ships
