Yanmar diesels run in a lot of the trawlers, sailboats, and inboard cruisers tied up throughout the Lower Keys — and they run for decades when they're maintained right. Skip the maintenance and salt air, heat cycling, and raw-water cooling systems will find the weak point. We service Yanmar diesels at your dock, wherever your boat lives.
Diesel work needs a different discipline than outboard work
A marine diesel doesn't fail like a gas outboard — it's fuel quality, injection timing, raw-water cooling, and the slow creep of corrosion in a heat exchanger nobody's opened in years. Our lead technician is an ABYC Certified Master Technician, trained to the standard that governs correct marine engine and electrical work — diesel or gas, inboard or outboard.
Yanmar services we provide
Scheduled Maintenance
- Oil, filter, and fuel filter changes on standard service intervals
- Raw-water pump impeller replacement
- Belt inspection and replacement
- Annual winterization and spring re-commissioning
Diagnostics & Troubleshooting
- No-start and hard-start diagnosis (fuel delivery, glow plugs, air in the fuel system)
- Overheating diagnosis — heat exchanger, raw-water strainer, thermostat
- Charging system and starting-battery diagnostics
Cooling System & Heat Exchanger
- Heat exchanger inspection, cleaning, and service
- Raw-water strainer service
- Coolant (closed-loop) system service
Fuel System
- Fuel filter and water-separator service
- Fuel system bleeding after filter changes or fuel starvation
- Injector and injection-pump troubleshooting
Mobile means no haul-out
Hauling an inboard sailboat or trawler for diesel service is expensive and often unnecessary. We bring the tools to your slip or mooring anywhere in Key West, Stock Island, Big Coppitt, Sugarloaf, Cudjoe, Summerland, Big Pine, or Marathon.
Book Yanmar diesel service
Call or text (305) 832-1206, email info@3marinekw.com, or book online.
Keep your boat in the water. We'll come to you.