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Our futured projects

Intake System for 6LP read more

Engine monitoring & alarm systems read more

About us

Marathon Diesel is a Yanmar certified dealer providing services in the lower and upper keys. We specialize in Yanmar but our certified technicians are familiar with many other makes commonly found in diesel boats. (Mas Power, fischer panda, Detroit, Kubota, Nani and many others) 

  • Original Yanmar Parts
  • Certified Techs.
  • Rebuilt Engines
  • Reman. Parts
  • Mobile Service
  • Dock Availible


read more

Latest posts

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1GM10   Number of cylinders 1 Output at crankshaft mhp/kW 9 - 6.7 Rated Speed rpm 3600 Displacement L / cu in 0.318 / 19.4 Standard drive KM2P-1 Weight with gear/drive Kg (lbs) 81 (179) Environmental status b,c {tab=KM2P-1} Gear Operation Manual ...

Posted on 25.02.2010 (in Powerboats)


This is a Nice Yanmar 6LY3-ETP 480HP electronic , less of 5 hours of operation. We recondition this engine when computer show 1 hour of operation , we found  the failure by a damaged injector nozzle from factory , this nozzle make some damaged in #3 pistons crown ( noth...

Posted on 29.10.2013 (in Powerboats)



 8LY-370   Number of cylinders 8 in V-90° Output at crankshaft mhp/kW 333 / 243 Rated Speed rpm 3683 Displacement L / cu in 4.46 / 272 Standard drive N/A Weight  Kg (lbs) 450 (992) Environmental status EU: RCD / US: EPA Tier...

Posted on 25.02.2010 (in Powerboats)

Cost Efficient

 We strive to bring you brings you several important and valuable benefits, such as consistent system availability, a predictable maintenance budget, and easier long-term management of maintenance costs. 

Time saving

No need to wait. Call today and schedule a service call at your convenience. Our phone line receives calls 24/7 and we are available for emergencies at any time. 

Docking Availible

Call us to ask about our docking fees. Stay with us while your engine/generator is repaired.

What do our customers say

Thanks for coming to my boat on a Saturday and on such short notice. I really needed to service the engine before sailing off with the kids.