Niigata (OEM)
Authorised

Diesel Engine

Purpose-Built
Engines for
Tugboats,
Passenger, and
Offshore Vessels
Best-in-Class
Fuel Efficiency
with Eco-Friendly
Compliance
Hybrid Propulsion
Pioneers in
Marine
Applications
Decades of
Marine Engine
Expertise
Global Support
Network
Powered by the
IHI Group

Niigata engines are renowned for their reliability, innovation, and exceptional performance in marine and industrial applications. With over a century of experience, Niigata has established itself as a leading manufacturer of high-quality diesel engines, including the Niigata marine engine and Niigata main engine series. Niigata diesel engines are designed to meet stringent environmental standards, such as IMO Tier III, while delivering powerful and efficient operation for tugboats, offshore support vessels, and other marine vessels.

The Niigata engine lineup includes medium-speed, low-speed, and high-speed models, each engineered for durability and low operational costs. Niigata engines are celebrated for their advanced technologies, such as the Miller cycle system and Variable Intake Valve Timing (VIVT), which enhance fuel efficiency and reduce emissions. Niigata also offers integrated propulsion solutions like the Z-Peller Propulsion System, which delivers superior maneuverability and thrust efficiency for workboats and harbor vessels. With a global service network and a commitment to continuous innovation, Niigata engines remain the preferred choice for demanding marine applications.

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Why choose Neptunus?

3 Decades of
Service Excellence
Engine & Propulsion
End-to-End Solutions
2500+ Sucessfull Projects
Delivered Worldwide
Trusted by 100+
Satisfied Customers
Dedicated Experts to
Address Emergencies

Applications of Niigata Engines

Niigata engines are widely used in marine propulsion, powering tugboats, offshore support vessels (OSVs), and workboats, thanks to their reliability and high torque at medium speeds. They also serve as auxiliary power generators for ships and land-based industries, ensuring stable electricity supply. Additionally, Niigata’s dual-fuel engines support environmentally friendly operations in LNG carriers and power plants, reducing emissions while maintaining efficiency.

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Niigata Diesel Engine Models

Niigata offers a diverse portfolio of high-speed, medium-speed, and low-speed diesel engines, along with the Z-Peller propulsion system and diesel generator sets for marine and power plant applications.
28AHX-DF Series AHX Series HX Series High-speed engines Niigata Diesel Generator Set

Niigata Engine Offering by Neptunus

As an OEM-authorized service provider and distributor of Niigata spare parts, Neptunus brings over 3 decades of expertise, with more than 20 years specifically dedicated to Niigata engine solutions. Our overhaul and repair services are designed to reduce downtime and ensure consistent engine performance across all operations.

We supply only genuine Niigata engine parts, recognizing that the use of authentic components is key to maintaining efficiency, reliability, and compliance. Backed by precision, quality, and deep technical know-how, Neptunus supports marine and industrial customers in achieving optimal engine performance and long-term sustainability.

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