Cat Marine Engine Repowers


Modern Power for Proven Hulls. Engineered for Uptime.


A repower is more than an engine swap. It is a complex integration project requiring mechanical, electrical, and structural expertise. Thompson Marine specializes in repowering workboats and commercial vessels with the latest CAT® engines, re-engineering complete power solutions that fit your vessel, your schedule, and your operational demands. Our goal is to deliver modern performance and reliability with minimal disruption to your fleet.

cat marine engine repowers

Why Choose Thompson Marine for Your Repower?

Repowering a vessel requires a deep understanding of how to integrate new systems within the constraints of an existing hull. Our process is built on decades of hands-on, industry experience ensuring your new CAT engine works seamlessly with your vessel’s existing equipment.

Holistic System Re-Engineering

We look beyond the engine to address the entire power system. Our scope includes the re-engineering of mechanical and electrical systems to ensure flawless integration with existing gears, pumps, controls, and monitoring equipment.

Custom Integration and Fabrication

Our team designs and fabricates custom packages in-house to overcome installation challenges unique to your vessel. We produce detailed mechanical installation drawings, electrical schematics, custom piping, and engine room layouts to streamline yard work and ensure a precise fit. From custom bases and mounts to complete pump and generator packages, our fabrication capabilities mean fewer dependencies on outside vendors and tighter control over quality and timeline.

Minimal Disruption, Maximum Performance

Our engineering-led approach is designed to minimize structural changes and vessel downtime. We plan every detail to get your vessel back in service as quickly as possible, with renewed power and efficiency.

Engineering-Driven Repower Solutions

Our design and analysis capabilities ensure your repowered vessel operates reliably under the most demanding conditions. We do not just install an engine. We validate the entire system.

Piping and Ventilation Analysis

We perform detailed calculations for exhaust, fuel, air, and cooling water systems, along with engine room ventilation sizing, to ensure optimal engine performance and longevity.

Vibration and Motion Analysis

To confirm smooth operation and structural integrity, our services include vibration isolation, six-degrees-of-motion (6-DOF) studies, Finite Element Analysis (FEA), and shaft whirling analysis.

Seamless Project Documentation

We provide comprehensive documentation to your shipyard including wiring diagrams and installation drawings, ensuring the project is executed efficiently and correctly.

Fleet Repower Planning and Support


For fleet managers, a repower program is a strategic investment in future uptime and performance. We partner with you to develop a phased plan that aligns with scheduled maintenance windows, minimizing operational interruptions.

Strategic Fleet Modernization

We help you evaluate your fleet and build a long-term plan for replacing or overhauling engines to meet new performance demands and emissions standards. With deep experience in high-output CAT engines including the 3500 and 3600 series, our team can help you assess the right path forward for your specific vessels and operational profile.

Parts Availability and Service Readiness

Keeping Your Fleet Running, Long After the Sale

Rapid-Response Field Service

Our specialized field service team and engineers are ready for rapid deployment, providing expert support from commissioning through the entire lifecycle of your repowered vessel.


Plan Your Repower Project

Every project starts with a conversation. Contact Thompson Marine to discuss what the right solution looks like.