Marine Diesel Engines
- Scheduled maintenance
- Heat exchanger service
- Repowering and parts sales
41.82° N · 71.51° WJohnston, Rhode IslandMarine diesel & generator service
Trusted hands,proven engines.
Engine and generator work out of Johnston, with ABYC Master Technicians on every job and a technician on call around the clock through the boating season.
42″
In-house ultrasonic tank
7
Engine & gen lines sold
ABYC
Master Technicians
24/7
On call Apr – Oct
What we do
What comes through the door.
Engines, generators, running gear, and getting boats in and out of the water. If it’s something else marine and diesel-adjacent, ask anyway.
Marine Generator Repair
- Scheduled maintenance
- Replacement
- Parts sales
Propeller, Shaft & Cutlass
- Seal replacement
- Shaft trueing and prop balancing
- Cutlass bearing work
Turbo Rebuilding
- Teardown and inspection
- Rebuild and balance
- Install and sea trial
Engine Overhauls & Rebuilds
- In-frame and out-of-frame overhauls
- Volvo Penta, Detroit, MTU, Yanmar, CAT, MAN
- Genuine parts sourcing
Winterizing & Commissioning
- Seasonal layup
- Spring commissioning
- Systems check
Repower
Old genset out. New one in.
When an engine or generator is past the point of another rebuild, we pull it and replace it, through the companionway, without cutting up your interior.
Service, any make
We service a lot more than we sell.
The lines we sell are what we stock and warranty. They aren’t the limit of what we’ll work on. A good part of our week is spent on engines from other builders entirely.
Volvo PentaCaterpillarMANCumminsMTU
Volvo Penta is the one we see most: diagnostics, in-frame and full rebuilds, genuine parts, and drive work from saildrives to IPS pods. Caterpillar, MAN, Cummins and MTU round out the bigger yacht and commercial power we’re in every week. Pod drives too: Volvo Penta IPS and Zeus, with service and diagnostics on both.
See what we service →
Lines we carry
Seven engine and generator lines, sold and serviced in-house.
Authorized dealer for six of them and certified for Mercury sales and service. Parts, warranty work, and factory training, not guesswork.
Yanmar
Main engines
From small sailboat auxiliaries to high-output powerboat blocks.
View Yanmar →
Mercury
Outboard & inboard
Gas and diesel, outboard and inboard. All of it certified sales and service.
View Mercury →
Kohler
Generators
Gas and diesel gensets from weekend-cruiser size up to commercial power.
View Kohler →
Nanni
Main engines
Sailboat and powerboat diesels, and the repower work that goes with them.
View Nanni →
Fischer Panda
Generators
The quiet ones. Compact, water-cooled gensets for boats where noise matters.
View Fischer Panda →
Phasor
Generators
Commercial-grade gensets for boats that can’t afford downtime.
View Phasor →
Westerbeke
Generators & engines
Onboard power since 1937. Gas and diesel generators, and the Westerbeke engines still running in a lot of New England boats.
View Westerbeke →
Recent work
From weekend cruisers to yacht engine rooms.
Every job photo on this site is a boat we actually worked on. The only exceptions are a few product shots supplied by the manufacturers we’re dealers for.
See the projects →
What owners say
Word of mouth, and a phone that keeps ringing.
Straight from our Google reviews.
★★★★★Google review
“Can’t say enough great things about the guys over at coastal marine (Nick and Bobby specifically) they really helped me out when I couldn’t even get some larger shops to pick up the phone. They turned around a catastrophic MTU turbo failure into a fully functional engine in under a week. The yard gave me an ETA from their mechanics of late October, completely saved my yachts New England season. Would use them again without question, anytime I’m in this area they’re going to be my first call if I have an issue.”
Yacht captain · MTU turbo & exhaust
★★★★★Google review
“I had a bow thruster motor failure. Bobby quickly diagnosed and fixed the problem in one visit. Solid communication throughout, before, during and after the repairs. He even checked out a few additional system issues I was having while he was there. He’s at the top of my list now for the next problem that may come up on my Back Cove.”
Back Cove owner · bow thruster
★★★★★Google review
“Bobby has fixed multiple issues on my 45′ sailboat, everything from HVAC to mechanical. He is honest and his service is prompt. Thanks to Bobby I can be confident in the safety and reliability of my boat.”
45′ sailboat · HVAC & mechanical
★★★★★Google review
“His report was done in record time and was detailed and direct, and he answered all of our questions. He really knows engines through and through. Highly recommend.”
Pre-purchase survey
★★★★★Google review
“His extensive knowledge of engines and mechanical systems made it easy to diagnose the issues my boat had with speed and accuracy. On time with a great attitude.”
Engine diagnostics
ABYC Master Technicians
American Boat & Yacht Council
Authorized dealer
Certified
Authorized dealer
Authorized dealer
Authorized dealer
Authorized dealer
Authorized dealer
Not sure what you need yet?
Tell us the boat and what it’s doing. We’ll tell you straight whether it’s a service, a repair, or time to repower.