Marine Propulsion Systems Repair and Overhaul Services

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With a rich portfolio spanning three decades, Neptunus has established itself as a leading provider of marine propulsion services. Our expertise extends to repairing and overhauling various types of machinery, including propulsion systems, making us a trusted partner for chief engineers and technical managers.

The marine propulsion system is a critical component responsible for generating the thrust necessary to propel a vessel through water. It comprises various elements, including the propeller, thruster, propulsion control, and stern tube seals.  

With an extensive range of expertise, our company is an independent service provider in repairing propulsion systems from leading manufacturers such as BERG, KAMOME, KAWASAKI, NIIGATA (including their Z-peller system) (OEM), NAKASHIMA, ROLLS ROYCE, SCHOTTEL, and WARTSILA. 

Our 27+ skilled technicians are well-versed in servicing and maintaining these advanced propulsion systems, ensuring optimal performance and reliability for various maritime vessels. Whether routine maintenance, troubleshooting, or comprehensive overhauls, we have the knowledge and resources to keep your vessel’s propulsion system operating at its best, minimizing downtime and maximizing efficiency.

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Marine Propulsion Repair Services at Neptunus

  • Thruster Repair Services

  Thruster repair services (Bow, Stern, and Azimuth) are provided by Neptunus to ensure optimal thrust generation and maneuverability. Our skilled technicians employ advanced techniques and state-of-the-art equipment to diagnose and rectify issues affecting all types of thruster performance.

  • Propeller Repair Services:

Fixed-Pitch Propeller (FPP) 

Our expertise extends to fixed-pitch propeller repairs , where we assess and address any damage or wear to the propeller blades, hub, and other components.

Controllable-Pitch Propeller (CPP)

Neptunus provides specialized services for controllable-pitch propellers. Our technicians are well-versed in the complexities of CPP systems, ensuring precise adjustments and repairs for seamless operation.

  • Propulsion Control Repair Services

We understand the intricate nature of propulsion control systems and their crucial role in governing vessel movement. Our team of experts is adept at diagnosing and resolving issues related to propulsion control.

  • Stern Tube Seal Repair Services

Stern tube seals play a vital role in preventing water ingress and lubricant loss, which can lead to costly repairs and downtime. At Neptunus, we offer stern tube seal repair services, ensuring the integrity of these critical components and prolonging the operational lifespan of your propulsion system

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Challenges in Marine Propulsion System Repair and Overhaul:

  • Complexity of Systems: Marine propulsion systems are intricate, combining mechanical, electrical, and fluid power components. Diagnosing and repairing issues requires a deep understanding of how these elements interact.
  • Demanding Environment: Marine machinery operates in harsh conditions like saltwater, extreme temperatures, and vibrations. This accelerates wear and tear, requiring specialized knowledge and techniques for repairs.
  • Time Constraints: Ships operate on tight schedules. Downtime for repairs translates to lost revenue. Minimizing repair time requires efficient planning, coordination, and readily available spare parts.
  • Spare Parts Availability: Sourcing replacement parts for marine propulsion systems, especially for older or less common models, can be challenging, causing delays in repairs.
  • Skilled Workforce: Effective repair and overhaul require a skilled workforce with expertise in marine propulsion systems. This can be difficult to find in remote locations.

Why Choose Neptunus for Your Propulsion System Repair and Overhaul?


With over 3 decades of service experience, Read more

Shortest Turnaround Time

We prioritize the shortest turnaround Read more

Remote and On-Site Support

Whether it's remote diagnostics or on-site Read more

Genuine and Optimized Spare Parts List

We provide genuine Wartsila spare Read more

Utilization of Advanced Technology

By leveraging the latest tools and technology Read more

Beyond Repair and Overhaul for Your Propulsion System

At Neptunus, we believe in managing reliability of asset and building long-term strategic relationships with our customers rather than just completing short-term projects for them. We provide customized solutions by understanding their requirements and identifying our roles towards accomplishing their larger goals of allowing operational efficiency in a cost-effective, reliable, and sustainable manner by overcoming maintenance challenges using the most advanced and cutting-edge technology available.

Today, with our proprietary, dual-class (ABS and IRS) approved marine engine monitoring system system and our in-house comprehensive Oil quality management featuring real-time oil condition monitoring , continuous kidney loop filtration system , we have helped our customers to:

  • Save anywhere between ~$20,000 and $60,000+ in overhaul costs (approximately over 30% of overhaul costs).
  • Prevent unplanned downtime.
  • Improve fuel combustion efficiency. 
  • Reduce your Scope 1 and Scope 3 emissions  to achieve your decarbonisation and ESG goals
  • Comply with the IMO’s EEXI Regulation
  • Better plan maintenance requirements, especially for assets located in inconvenient locations.

If you want to reach similar goals for your organisation, schedule a “discovery call” with our specialists to learn how we can assist you. 


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In addition to marine propulsion services, we specialize in auxiliary engine service and ship engine repair services, providing a complete suite of solutions for the marine and oil & gas industries. From diesel generator repair to various types of engines, our marine expert team ensures top-notch service and reliability for all your machinery needs.

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