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Cummins NTA855-M350 Marine Engine 350HP (261kW) Propulsion Solution
The Cummins NTA855-M350 marine engine is a proven 14L inline 6-cylinder propulsion unit designed for continuous duty marine operations. As a core product supplied by HekoPower, this engine is widely used in fishing boats, tugboats, cargo vessels, and small passenger ships requiring stable 350HP output under demanding conditions.
Compared with standard catalogue descriptions, HekoPower provides not only the engine itself but also complete marine propulsion solutions, including gearbox matching, cooling systems, and installation guidance. This ensures that customers receive a ready-to-deploy system rather than a standalone engine.
Tech Specs of NTA855-M350
General Engine Data
General Engine Data
Engine Model: Cummins NTA855-M350
Type: 6 Cylinders in Line
Displacement: 14 L
Bore * Stroke: 140 * 152
Net Weight (with flywheel & alternator): 1430 Kg
Overall Dimension: 1809mm*881mm*1598mm
Engine Configuration No.: D0903348MX02
Key Performance Data
Rated Power: 261 kW/350HP
Rated Speed: 1800 rpm
Low Idle Speed: 575-675 rpm
High Idle Speed: 1962-2106 rpm
Rating Type: Continuous Running Power
Fuel Consumption (Running Speed): ≤ 220 g/kW.hr
Max Torque/Speed: 1385 N.m @ 1500 rpm
More Technical Data
Certification: CCS/IMO Certificates
Governor Type: Mechanical Control
Aspiration: Turbocharged/Aftercooled
Compression Radio: 14.5:1
Fuel System: Cummins Pressure Time (PT Pump)
Starting System: Electrical Start (24V/100AMP)
Lowest Starting Temp Without auxiliary system: -12℃
Cooling Method: Sea water pump, Heat exchanger, Water cooled
Core Technical Advantages & Performance Analysis
The NTA855 series has become an industry benchmark due to its mature and advanced technology.
Advanced PT Fuel System
The patented Cummins PT (Pressure-Time) fuel system precisely controls fuel injection, ensuring efficient and complete combustion under all operating conditions. This not only provides powerful performance but also significantly reduces fuel consumption.
Efficient Turbocharging
Equipped with a Holset HT3B turbocharger, the engine effectively utilizes exhaust energy to dramatically increase air intake efficiency. This ensures high torque output (1385 N·m @ 1500 rpm) even at low RPMs, perfectly matching the demands of marine propulsion.
Robust & Durable Design
Featuring an in-line 6-cylinder, 4-stroke, water-cooled design, its 14-liter displacement provides a powerful foundation. The high-strength forged steel crankshaft and optimized piston design ensure a long service life in harsh marine environments.
Excellent Environmental Adaptability
The engine demonstrates strong adaptability, with a standard minimum starting temperature of -12℃ without requiring auxiliary starting systems. This simplifies equipment configuration and reduces costs.
Application Scenarios for Different Vessel Types
The Cummins NTA855-M350 is a versatile marine main engine, and its power characteristics make it excel in various vessel applications.
Fishing Boat Power
For fishing boats that require long hours of stable operation, high reliability and low maintenance costs are paramount. The NTA855-M350's strong power and excellent fuel economy effectively guarantee operational efficiency and reduce operating costs.
Tugboat & Workboat Power
Tugboat operations demand high torque at low speeds. The NTA855-M350's torque characteristics are perfectly suited for this, providing powerful towing force.
Small Cargo Ships & Barges
For short-haul transport, this engine offers an ideal balance of power and economy, making it a reliable partner for regional waterway transportation.
Passenger Ship & Yacht Propulsion
Its smooth operation and good noise control also make it suitable for passenger vessels or large yachts where comfort is a consideration.
Comparison: NTA855-M350 vs. NTA855-M400
When deciding on your propulsion unit, a Cummins NTA855-M350 vs NTA855-M400 performance comparison is often necessary. While the M400 offers higher peak horsepower, the M350 is often preferred for its exceptional longevity and lower thermal stress in continuous duty cycles. The Cummins NTA855 engine differences lie primarily in the fuel injection calibration and turbocharger mapping, allowing the M350 to offer a more economical NTA855-M350 export price for budget-conscious fleet upgrades.
- NTA855-M350: Rated at 350HP (261kW), it emphasizes fuel economy and reliability for continuous operation, making it the preferred choice for most standard applications.
- NTA855-M400: Rated at 400HP (298kW), it achieves higher power output by adjusting the fuel system and turbocharger, making it suitable for applications with higher power demands.
Cooling System & Marine Adaptation
Seawater Heat Exchanger Cooling System
The NTA855-M350 uses a seawater pump combined with a heat exchanger cooling system, ensuring consistent temperature control even during long-duration marine operations.
Low Temperature Starting Capability (-12℃)
This engine supports cold start capability down to -12℃ without auxiliary systems, making it suitable for colder marine environments.
Maintenance, Parts, and Global Support
As a dedicated wholesale supplier, HekoPower doesn't just sell engines; we support their entire lifecycle.
The PT Fuel System and Turbocharging
The NTA855-M350 PT fuel pump is world-renowned for its simplicity and ease of repair. We provide a complete replacement parts list for NTA855-M350 PT fuel system components, ensuring your vessel stays operational. Additionally, our NTA855-M350 overhaul kits include genuine gaskets and seals to maintain CCS IMO double certification standards.
Routine Care with Fleetguard
To maximize engine life, HekoPower recommends the Fleetguard oil filter maintenance schedule. Regular filtration changes ensure the 350HP Cummins marine diesel engine maintains its Tier II emission compliance and fuel efficiency over thousands of running hours.
Why Choose HekoPower as Your Supplier
As a professional supplier of CCEC Cummins marine engines, HekoPower provides:
- Original new engine supply
- 12-month warranty support
- Technical consultation for vessel matching
- Global export experience
This ensures that customers receive both high-quality products and reliable after-sales support.
Cummins N855-M Series (N855 Marine Engine), marine propulsion engines for commercial and recreational applications, original products from Chongqing Cummins Engine Plant(CCEC). This series mainly includes NTA855-M350, NTA855-M400, NTA855-M450, NTA855-M200, NTA855-M220, NTA855-M240, NTA855-M250, NTA855-M270, NTA855-M300. All engines complete with sea water pump, heat exchanger, CCS/IMO certificates.
