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Service & Repair for Commercial Boats

At Casco Bay Diesel & Injection Service, we’re the go-to mechanics for commercial fishing boats across Maine, expanding our expertise from Portland, Maine to Hyannis, Massachusetts on Cape Cod.

Whether you’re hauling traps or dragging nets, our team is ready to step in, diagnose, and repair. This makes sure your engine runs at peak performance. We’ll get you back on the water fast, so you can keep your business thriving without missing a catch.

SERVICES

From Dock to Deep Sea

As a commercial marine boat owner, your vessel is a valuable asset that requires meticulous maintenance to preserve its performance and value. Keeping your engines in peak condition is not just an investment in longevity—it’s essential for ensuring safe, reliable operation every time you set sail.

Our dedication to expert craftsmanship and meticulous care ensures your engine operates safely and reliably, giving you complete peace of mind on the water.

Testimonals

What our clients say about Casco Bay Diesel

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Frequently Asked Questions

Answers to your most common questions

Casco Bay Diesel strives to be as transparent as possible. We answer all your most asked questions to the best of our ability.

Got a question? Ask us by emailing info@cascobaydiesel.com or give us a call on (207) 878-9377.

When should my engine be serviced?

It depends on your engine make and model. All engines have different criteria to meet. Contact us with your engine make and model and we can advise you further.

Yes, we do.

Yes. As an authorized dealer, we have all the correct tooling required.

If your diesel engine, transmission or fuel injection pump is out of warranty then simply contact our diesel engine shop right away.

Casco Bay Diesel offers specialized support for commercial fleets, including engine overhauls, fuel system calibration, and emergency dockside repair. We support tugs, ferries, fishing vessels, and passenger boats with a focus on minimizing “time-at-dock” through rapid diagnostics and a deep inventory of OEM parts for Cummins, Yanmar, and Scania.
Yes, we are equipped with the specialized diagnostic hardware required to service and maintain modern EPA Tier III and Tier IV compliant engines. Our technicians ensure that selective catalytic reduction (SCR) systems and diesel particulate filters (DPF) are functioning correctly to meet environmental regulations and prevent derate issues.
We offer customized preventative maintenance programs for commercial operators in Maine and Massachusetts. These programs include scheduled fluid analysis, cooling system descaling, and valve adjustments designed to extend engine life and prevent catastrophic failure during peak operating seasons.
While major machining is done in our specialized shops in Portland and Hyannis, we perform comprehensive in-frame overhauls and component replacements dockside. This reduces the need for costly engine removals and gets commercial vessels back into service faster without sacrificing manufacturer-spec precision.

We understand that for commercial operators, downtime is lost revenue. Casco Bay Diesel prioritizes commercial emergency calls, providing mobile technicians throughout the New England coast to address critical engine or transmission failures that threaten a vessel’s operational schedule.

Marine & Industrial Diesel Engine & Injection Repair

We help you Get back up & Running