Diesel Engine Repair & Maintenance

  • engine pulleys

    Diesel Regular Maintenance

    Give us a call for your regular oil and filter changes on all brands of inboard diesel and gas engines.

  • Justin with dad glare

    Mobile Professional technicians

    That show up to your boat with that “Dad smolder” look. And get stuff done.

  • Diesel

    Diesel Diagnostics & Repair

    Our techs have years of combined experience diagnosing Mercruiser issues and conducting regular maintenance.

  • ABYC master tech

    ABYC Trained Techs

    Many of our techs are ABYC certified Master Technicians. Old Town Marine is a member company.

We work on all the major inboard diesel brands including Volvo Penta, Yanmar, Mann, John Deere and Detroit Diesel engines.

Our diesel repair and maintenance services in the Lower Keys are designed to keep your marine diesel engines running at peak performance. Whether you need routine maintenance, engine diagnostics, or complex repairs, our team of certified diesel technicians has the expertise to handle it all. We service a wide range of diesel engine brands and models, ensuring thorough inspections, fluid changes, filter replacements, and system checks. From addressing fuel system issues to troubleshooting power loss, we provide reliable, on-site service to keep your vessel ready for any journey.

We also have technicians who specialize in gas engines: particularly inboard gas engines like Mercruisers or others found on Yamaha jet boats or jet skis. Give us a ring.

Marine Diesel Repair Services

  • Cooling Circuit Flush

  • Alternator Troubleshoot and R&R

  • Alternator Belts

  • Pulley Replacement

  • Water Pumps

  • Heat Exchangers

Marine Diesel Maintenance Services

  • Oil and Filter Change

  • Primary and Secondary Fuel Filter Change

  • Transmission service

  • Zinc Replacement

  • Replacement of Belts

  • Diesel Generator Service

  • Impeller Exchange