Details
CCEC Cummins NTA855-DM317 Marine Auxiliary Engine (317kW / 425HP @ 1500 RPM)
The CCEC Cummins NTA855-DM317 is a 14-liter, 6-cylinder in-line diesel engine engineered for heavy-duty marine auxiliary generator applications. Delivering a continuous prime rating of 317 kW (425 HP) at 1500 RPM, this mechanical engine powers electrical generator sets onboard cargo vessels, workboats, and offshore platforms.
HekoPower supplies genuine CCEC NTA855-DM317 engine assemblies built to original Cummins factory specifications under CPL CQ127 and engine datasheet D093641MX02. Whether you are building a new marine genset package or repowering an existing auxiliary power system, our engineering team ensures direct fitment, full CCS/IMO compliance, and factory support.
Tech Specs of Cummins NTA855-DM317
General Engine Data
Engine Model: Cummins NTA855-DM317
Type: 6 Cylinders in Line
Displacement: 14 L
Bore * Stroke: 140 * 152
Net Weight (with flywheel & alternator): 1420 Kg
Overall Dimension: 1453mm*947mm*1296mm
Engine Configuration No.: D093641MX02
Key Performance Data
Rated Power: 317 kW/425HP
Rated Speed: 1500 rpm
Low Idle Speed: 575-650 rpm
Fuel Consumption (Running Speed): ≤ 243 g/kW.hr
Torque/Rated Speed: 167 N.m @ 2234 rpm
More Technical Data
Certification: CCS/IMO Certificates
Aspiration: Turbocharged/Aftercooled
Compression Radio: 14.0:1
Fuel System: Cummins Pressure Time (PT Pump)
Starting System: Electrical starting motor (12V/24V)
Lowest Starting Temp Without auxiliary system: -12℃
Engine Cooling System: Sea water pump, Heat exchanger, Wet exhaust manifold
Cooling Method: Water cooling
Technical Comparisons: NTA855-DM317 vs. Alternative Marine Power Units
Selecting the correct auxiliary engine requires evaluating power output, mechanical compatibility, and duty profiles against similar models in the market.
Upgrading Legacy Naturally Aspirated or Turbocharged NT855 Units
Replacing an older naturally aspirated N855 or standard turbocharged NT855 with the NTA855-DM317 brings substantial performance improvements without altering bedplate mounting footprints. Legacy NT855 auxiliary units often struggle with thermal load during prolonged high-demand electrical generation. The NTA855-DM317 incorporates water-air aftercooling and reinforced cylinder heads, allowing higher thermal resistance and greater power density within the exact same 14-liter engine block footprint.
NTA855-DM317 vs. Lower-Output NTA855-DM Variants
Within the CCEC 14-liter marine auxiliary family, ratings range from 240 kW up to 360 kW. The NTA855-DM317 sits at a critical threshold, serving 300 kVA to 350 kVA generator configurations. Lower ratings like the NTA855-DM287 (287 kW) share the same block but use different CPL fuel injector calibrations and turbocharger matchings. Operating an underpowered model under heavy electrical loads causes excessive exhaust temperatures, whereas stepping up to the DM317 provides the necessary torque reserve at 1500 RPM to sustain steady 50 Hz power output.
Real-World Marine Application Scenarios
The CCEC NTA855-DM317 is matched for marine generator drive duties where electrical load consistency and mechanical reliability are non-negotiable.
Commercial Cargo Ships and Bulk Carriers
On ocean-going cargo vessels, the NTA855-DM317 serves as the prime mover for shipboard auxiliary gensets. These units supply continuous 380V–440V electrical power for navigation systems, deck cranes, ballast pumps, and crew living quarters during long transit cycles.
Inland Towboats and Ocean Tugs
Tugboats demand immediate auxiliary power response when operating heavy hydraulic winches and fire-fighting pumps. The 10% overload rating (351 kW) of the DM317 handles severe electrical spikes when large inductive loads engage simultaneously.
Fishing Trawlers and Processing Vessels
In commercial fishing applications, auxiliary engines drive freezer compressors and processing machinery under variable ambient sea temperatures. The heat exchanger cooling setup on the NTA855-DM317 maintains steady engine operating temperatures even in tropical or cold-water environments.
Installation, Maintenance, and Common Misconceptions
Proper installation and routine service determine the operational lifespan of a 14-liter mechanical marine engine.
Essential Maintenance Practices
- PT Injector and Valve Calibration: Check injector rocker adjustments and valve clearances every 1,500 operating hours to maintain correct timing and prevent unburnt fuel smoke.
- Coolant System Chemistry: Maintain correct Supplemental Coolant Additive (SCA) levels in the jacket water system to prevent cylinder liner cavitation corrosion.
- Seawater Pump Maintenance: Inspect flexible impellers and raw water strainers regularly to ensure rated cooling flow across the heat exchanger core.
Common Misconceptions About the NTA855-DM317
Misconception 1: Light-load operation extends engine life.
Running a 14-liter diesel engine under light loads (below 30% rated capacity) for long periods causes low cylinder temperatures, incomplete combustion, and fuel slobbering (wet stacking) in the exhaust manifold. Auxiliary engines should operate above 50% load whenever possible to maintain clean piston rings and efficient combustion.
Misconception 2: All N855 engine parts are fully interchangeable.
While basic block castings are shared across the N855 family, marine auxiliary models use specific CPL parts (CPL CQ127). Using industrial or automotive injectors, pistons, or turbochargers in an NTA855-DM317 will alter the compression ratio and compromise marine safety certifications.
Exploring the Full NTA855 Auxiliary Engine Range
Matching the right power output to your generator head is critical for operational efficiency. Below, you can explore other power ratings and specifications within the Cummins NTA855 marine auxiliary series to find the precise engine for your vessel's power requirements.
Cummins N855-DM Series, Marine Auxiliary Engines for commercial and recreational applications, original products from Chongqing Cummins Engine Plant(CCEC). This series mainly includes NT855-DM180, NT855-DM205, NT855-DM230, NT855-DM240, NTA855-DM264, NTA855-DM284, NTA855-DM287, NTA855-DM306, NTA855-DM313,NTA855-DM317. All engines complete with sea water pump, heat exchanger, CCS/IMO certificates.
Frequently Asked Questions
What is the fuel consumption rate of the NTA855-DM317 at 1500 RPM?
Fuel consumption varies by load demand. At 100% prime power (317 kW), fuel consumption averages approximately 205–210 g/kW.h. At 75% load, consumption drops to around 150–155 g/kW.h, providing fuel economy during routine cruising duties.
Can the NTA855-DM317 drive a Front Power Take-Off (PTO)?
Yes, the front crankshaft stub of the NTA855-DM317 supports a front PTO assembly to drive auxiliary hydraulic pumps or emergency bilge equipment, provided side-load limits match Cummins installation guidelines.
What marine classification certificates are available for this engine?
CCEC NTA855-DM317 engine assemblies supplied by HekoPower can be delivered with major classification society certificates, including CCS (China Classification Society) and IMO Tier II NOx compliance documentation.
What is the standard lead time for a complete NTA855-DM317 engine assembly?
Standard factory lead time for a complete CCEC marine auxiliary engine typically ranges between 15 to 25 business days, depending on specific marine classification society inspection requirements and customized cooling equipment options.
