Repair services for hulls, engines, drivetrains, and trailers performed by marine-trained technicians.
Boat repair is its own discipline. Marine engines, hulls, and electrical systems fail differently than cars because they live in salt water, see massive vibration, and run with intake-water cooling. General mechanics can sometimes fix a boat the same way they fix a car, but most of the time the boat fails again within the season. The salt, the ethanol fuel, and the layup of a fiberglass hull all demand procedures and parts that a typical auto shop does not stock.
At Atlantic Boat Repair we cover three main areas of repair work. Engine and drivetrain repair includes compression issues, no-start diagnosis, lower-unit failures, cooling-system rebuilds, and full repower jobs. Fiberglass and structural work includes gelcoat cracks, hull blisters, transom failure, impact damage, and stringer or deck core repair. Trailer repair includes bearings, brakes, axles, lights, marine-grade wiring, and frame work. Each of those has its own playbook and its own tools, and we run all three under one roof.
Our diagnostic process starts with the symptoms you describe and works backward toward the root cause. Marine systems compound problems quickly: an old impeller causes an overheat, the overheat causes a head gasket to fail, the failed head gasket lets coolant into the cylinder, and the cylinder seizes. Diagnosing the wrong link in that chain means replacing the wrong part. We run compression tests, fault-code scans, cooling-flow checks, and on-water diagnostics before we order parts.
The boats we see are mostly kept in Plymouth or hauled from the surrounding Cape Cod Bay area, so we know what fails most: water-pump impellers stiffened from sitting all winter, fuel system damage from ethanol, lower-unit seal failures from running aground, transom rot from years of moisture under the splash well. Local context speeds up diagnosis. So does knowing the major boat brands and their common failure modes. We service both two-stroke and four-stroke outboards from Mercury, Yamaha, Honda, Suzuki, Evinrude, and Tohatsu, plus most inboard and I/O setups.
Choose from our range of boat repair services.
Boat repower services. Engine swaps, repowering, and full power-train replacement for outboards and inboards.
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Boat fiberglass repair for hull cracks, gelcoat repair, structural fiberglass work, and impact damage.
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Boat trailer repair and maintenance: bearings, brakes, lights, axles, frame, and wiring.
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We are your trusted partner for all boat repair needs.
Boats are not cars. We have the marine-specific tools, brand software, and procedures that a general mechanic does not.
Local pickup and drop-off, fast scheduling, and a real conversation about your boat instead of a ticket number.
We tell you what is necessary this year versus next, and we will say so if a boat is past the point of repair.
I have nothing but good things to say about Atlantic Boat Repairs. Ron and Ryan have been reliable and affordable for years. They always answer the phone, and provide exceptionally fast turnaround even with last minute service requests. Repowered my boat with twin 150 tohatsus 4 season ago (650 hours) and absolutely love them. Thanks guys- you are the best.
peter lyons
Verified Google ReviewMarshfield
Ron and Ryan were fantastic to work with. Customer service and attention to detail made repowering my boat a great experience. Would recommend Atlantic to anyone looking for a repower or outboard work.
Christopher Yuknis
Verified Google Review
You can’t find a better boat repair shop on the east coast! They repowered my boat 2 years ago! And have stood by me through all oil changes upper and lower unit. Any small problems have been addressed immediately! And the friendly service of Ron and his head mechanic Ryan has been phenomenal! Don’t hesitate to bring your boat to Atlantic! For the best customer service you will ever experience! Ron has 50 years of knowledge and experience and can deliver satisfaction! As well as Ryan! A hell of a mechanic!
Brian Donahue
Verified Google Review
I recently had to upgrade my older outboards to something a little newer and with more horsepower. Ron and Ryan were extremely helpful when I was looking for engines, and when I did find a pair of 250's, they took delivery of them, removed my old engines and had the new ones installed in no time. We also worked through some electronics upgrades as well. They had some great suggestions and I'm extremely happy with the end result. The communication through the whole process was outstanding, they would always provide updates and expected completion date. This all occurred during one of their busiest times of the year. Can't say enough good things about the team at Atlantic!
Joe Craig
Verified Google Review
Great shop - highly recommend to anyone looking for a good boat service shop without the marina prices. Ron and Ryan repowered my boat with a tohatsu 250 and did a phenomenal job. Got it done in less than 2 weeks to get me back on the water
Chris Romano
Verified Google Review
I’ve had a boat for many years and had gone to various shops for winterizing and repairs. Some took forever to complete the work and others ignored (more than once) my request to look at an electronics issue I was having. Then I found Atlantic! Ryan has been absolutely great for the past several years I’ve been going there. I don’t think there is anything they don’t do! I’ve had new electronics, winterizing, engine maintenance, even trailer repair. They do detailing too. Always a fair price and they are extremely responsive. I’ve referred 3 other friends there who have all been satisfied customers.
Jeffrey Norton
Verified Google Review
Common questions about our boat repair.
Yes. We service both outboards (two-stroke and four-stroke from all the major manufacturers) and inboard and I/O drive setups. The exact brand list shifts year to year as engines age out, but we keep tools and procedures for most production marine engines in the Cape Cod Bay area.
On outboards: Mercury, Yamaha, Honda, Suzuki, Evinrude, and Tohatsu. On inboards and I/O drives: most production marine engines, including MerCruiser, Volvo Penta, and Crusader. If you have an unusual engine, call ahead and we will let you know whether we can take it.
Small repairs (impeller swap, plug change, filter service) are usually one to two days. Larger repairs (lower-unit work, fuel system rebuild) run one to two weeks depending on parts availability. Repowers and fiberglass jobs run several weeks. We give a written timeline at the estimate stage.
Sometimes, if you call ahead and the work is straightforward. We do same-day service for things like impeller checks, fuel filter changes, and quick diagnostic scans when scheduling allows. Walk-ins go on the next-available slot.
For most diagnostic and minor repair work, the boat needs to come to the shop because we need the tools, parts, and a real engine run-up. For specific situations (large boats that cannot be easily trailered, in-marina jump-starts, on-site assessments), call us and we can talk through whether mobile is realistic.
Customers bring their boats to our Plymouth shop from these towns.
Licensed & Insured
Fully licensed and insured for your protection
Flexible Drop-Off Available
Convenient marine service options
40+ Years
4 decades of trusted service
