📍 1350 Oceanview Ave, Marathon, FL 33050 📞 (305) 743-7116  |  Mon–Fri 8am–5pm (Closed 12–1pm)

Marathon Diesel Repair

“Only the best will do.” — Florida Keys

Authorized Yanmar Dealer Authorized Suzuki Marine Dealer

What We Do

Full-service marine diesel repair — in our shop or at your dock

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Marine Diesel Repair

Complete engine diagnostics, repair, and reconditioning for Yanmar diesel engines up to 750HP.

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Suzuki Outboard Service

Authorized Suzuki Marine dealer — full service, parts, and warranty work on Suzuki outboard engines.

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Mobile Service

We come to you. $55 service call + $200/hr labor. Dockside, marina, or wherever you are in the Keys.

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Engine Reconditioning

Remanufactured marine diesel engines available for sale. Ask about our current Yanmar inventory.

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Parts Sales

Largest Yanmar parts inventory in the Florida Keys. Suzuki parts also in stock.

Water Access

Accessible by boat — end of the canal between Pancho’s Fuel Dock and Burdines Marina.

Recent Parts for Sale

Updated as inventory changes — view all parts →

4LHA-STP 240Hp@3300rpm. Serial 3740.This is a complete engine rebuilt from bottom-top, with all new Yanmar parts: Main bearing, liners, pistons, seals, gaskets, starter, alternator, raw water pump, freshwater pump, stainless steel mixing elbow, all new hoses and new engine harness and sensors, a Damper plate for a ZF63 and 68A. This is a perfect replacement, or a new boat repower.
Yanmar Parts

4LHA-STP 240Hp@3300rpm. Serial 3740.This is a complete engine rebuilt from bottom-top, with all new Yanmar parts: Main bearing, liners, pistons, seals, gaskets, starter, alternator, raw water pump, freshwater pump, stainless steel mixing elbow, all new hoses and new engine harness and sensors, a Damper plate for a ZF63 and 68A. This is a perfect replacement, or a new boat repower.

$25,000.00
Contact to Purchase
Used Hurth HBW10 Marine Gear
with Ratio 2:1 Marine Gear, used “take off” and service. This was attached to a Kubota engine replaced with a Yanmar, gear work perfect.
Other Parts

Used Hurth HBW10 Marine Gear with Ratio 2:1 Marine Gear, used “take off” and service. This was attached to a Kubota engine replaced with a Yanmar, gear work perfect.

$700.00
Contact to Purchase
YANMAR 6LYA and 6LY2 heat exchanger.
This is a “take Off” pressure tested and service heat exchanger for Yanmar marine engines 6LYA(2). As of 2026 the new assembly cost $2408.00
Yanmar Parts

YANMAR 6LYA and 6LY2 heat exchanger. This is a “take Off” pressure tested and service heat exchanger for Yanmar marine engines 6LYA(2). As of 2026 the new assembly cost $2408.00

$1,500.00
Contact to Purchase
4LH(A)-STE(P) series Flywheel Housing.
This is a “Take Off” in good condition to be reused. Fits all 4LH series: 4LH-TE, 4LH-THE, 4LHDTE, 4LH-STE, and all 4LHA series.
Yanmar Parts

4LH(A)-STE(P) series Flywheel Housing. This is a “Take Off” in good condition to be reused. Fits all 4LH series: 4LH-TE, 4LH-THE, 4LHDTE, 4LH-STE, and all 4LHA series.

$800.00
Contact to Purchase
💳 Payment Options:
🤝 Local Pickup — Pay on arrival
📱 Zelle — Fast & easy transfer
💳 Stripe — Scan QR code to pay
📍 24.7046° N, 81.1090° W ⚓ Marathon, Florida Keys Open in Google Maps
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Marathon Diesel Assistant

Ask me about our services & parts

Hi! Ask me anything about Marathon Diesel — services, rates, hours, Yanmar or Suzuki parts.