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Yanmar 6LY3-ETP – Inboard Diesel Engine 480 HP
Yanmar 6LY3-ETP – 480 HP utilizes a flagship 5.8L propulsion architecture featuring 24 valves and full electronic engine management. This 480 HP unit provides a high power-to-weight ratio and smoke-free operation, incorporating a high-velocity turbocharger to deliver the aggressive acceleration and top-end speed preferred by elite tournament anglers and offshore yacht owners.
- Precision Operational Data: Rated at 480 HP (353 kW) at 3300 RPM.
- Internal Engine Configuration Type: Inline 6-Cylinder 5.81L Displacement.
- Advanced Fuel Delivery System: Electronic Injection with 24-Valve Head.
- Recommended Vessel Application Use: Engineered for performance sportfishers and luxury yachts.
- Factory Protection Service Plan: Yanmar 2+3 year limited warranty coverage.
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Description
Yanmar 6LY3-ETP 480 HP – Maximum Performance Sportfish Diesel
Pushing the boundaries of the 5.8-liter block, the Yanmar 6LY3-ETP generates a class-leading 480 HP at 3300 RPM. This engine solves the demand for high-speed interceptor performance in American sportfishing boats and fast express cruisers. By optimizing the turbocharger mapping and common-rail timing, Yanmar has created a high-torque powerhouse that allows US captains to reach distant fishing grounds faster while maintaining the fuel efficiency needed for extended durations offshore.
Adhering to USA EPA Tier 3 standards, the 6LY3-ETP features a 24-valve head and electronic management for optimized combustion cycles at all throttle positions. For the American operator, this results in a responsive, low-noise engine that meets all modern environmental requirements without sacrificing the “hole shot” acceleration needed in heavy seas. Its robust cooling architecture is designed for high-stress operation, ensuring durability in the high-salinity and high-temperature environments of the American Gulf Coast.
Core Technical Specifications
- Maximum Output: 480 HP at 3300 RPM.
- Displacement: 354 cubic inches (5.813 Liters).
- Configuration: 6-cylinder in-line diesel engine.
- Aspiration: Turbocharged and liquid-cooled aftercooler.
- Dry Weight: Approximately 1411 lbs with gearbox.
- Alternator: 12V / 80A high-capacity output.
- Compliance: EPA Tier 3 and IMO NOx compliant.
- Control System: Full electronic vessel control (EVC).
Yanmar 6LY3-ETP Full Specs
| Engine type | In-line 6, 4-stroke Diesel |
| Displacement | 5.813L (354 cid) |
| Bore x stroke | 106 x 110 mm |
| Horsepower | 480 hp (353 kW) |
| Rated rpm | 3300 rpm |
| Aspiration | Turbocharged & Intercooled |
| Compression ratio | 16.7:1 |
| Fuel system | Electronic Common Rail |
| Recommended fuel | Diesel (EN 590) |
| Ignition/Firing Order | Compression / 1-5-3-6-2-4 |
| Alternator | 12V, 80 Amp |
| Gear ratio/Drive | KMH61A / ZF compatible |
| Transmission | Hydraulic Marine Gear |
| Dry weight | 640 kg (1411 lbs) |
| Flywheel housing | SAE 3 |
| Steering | Electronic Control compatible |
| Coolant capacity | 20L |
| Exhaust system | Water cooled manifold |
| Cooling system | Heat Exchanger |
| Lubrication | Forced lubrication |
| Oil capacity | 18L |
| Emissions rating | EPA Tier 2, RCD I, IMO compliant |
Yanmar 6LY3-ETP Service & Performance Guide
What is the fuel consumption of the Yanmar 6LY3-ETP?
The 6LY3-ETP consumes roughly 24.1 gallons per hour at its full 3,300 RPM, delivering a maximum 480 HP. This is the highest-rated version of the 6LY3 series, optimized for maximum speed in light-to-medium planing vessels. Cruise at 2,600 RPM to optimize the engine's torque curve for better fuel efficiency.
What oil grade is required for the Yanmar 6LY3-ETP?
This engine requires 20.1 quarts of premium SAE 15W-40 oil meeting API Service Class CI-4. Due to the 480 HP output, the oil must maintain high shear stability under extreme thermal stress. Oil and filter changes are mandatory every 250 hours to protect the high-stress internal components.
How does the Yanmar 6LY3-ETP cooling system operate?
It features a dual-circuit cooling system with a high-efficiency freshwater loop and a seawater-cooled intercooler designed for high-boost pressures. The aftercooler is critical for cooling the compressed air to maintain the 480 HP rating. Monitor the seawater pump's wear plate annually to ensure maximum flow at high RPMs.
What are the electrical system specifications for this engine?
The ETP model utilizes a 12V-80A alternator to power the electronic fuel management and EVC systems. This setup provides seamless integration with digital helms and provides steady voltage to the electronic engine actuators. Ensure your battery bank has a high discharge rate to support the 480 HP engine's starter motor.
What are the physical dimensions and weight of the 6LY3-ETP?
The dry weight is 1,411 lbs, measuring 51.2 inches in length and 27.6 inches in width. Its high power-to-weight ratio makes it a favorite for repowering older sport-fishing boats. Reinforced engine stringers are recommended to handle the concentrated torque output of this high-performance diesel engine.
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