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Yanmar 6LY440 – Marine Diesel Engine 440 HP
Yanmar 6LY440 – 440 HP features a flagship 5.8L 4-stroke propulsion unit engineered for the highest level of performance in its class. Delivering a massive 440 HP, this model utilizes high-pressure common rail injection and a 24-valve head to maximize thermal efficiency, providing the explosive hole-shot and high top-end speed preferred by elite offshore anglers and performance yacht owners.
- Transom/Engine Integration Specification: Rated at 440 HP (324 kW) at 3300 RPM.
- Core Engine Mechanical Design: Inline 6-Cylinder 5.81L Turbo-Aftercooled.
- High Precision Fuel Induction: Electronic Common Rail with Precision Injectors.
- Optimal Marine Vessel Compatibility: Perfect for flagship offshore sportfishers and cruisers.
- Long Term Warranty Coverage: Yanmar 2+3 year limited warranty (select regions).
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Description
Yanmar 6LY440 440 HP – Commercial Grade In-Line Marine Diesel
Maintaining high power density in a narrow, in-line 6-cylinder footprint is the primary engineering focus of the Yanmar 6LY440. A favorite among American commercial fishermen and high-performance cruiser owners, this 5.8-liter engine produces a formidable 440 HP at 3300 RPM. Its narrow profile solves the problem of tight twin-engine installations in deep-V hulls, while the legendary “LY” series block provides the mechanical durability required for the rigorous demands of USA coastal service.
Fully compliant with EPA Tier 3 emission standards, the 6LY440 utilizes a next-generation common-rail system and a 24-valve cylinder head to ensure maximum airflow and clean combustion. For the American operator, this engine offers a significant reduction in noise and vibration compared to previous generations, enhancing the working environment on commercial vessels. The robust heat exchanger and saltwater-resistant components are specifically engineered to endure the harsh conditions of the Bering Sea or the Florida Keys.
Core Technical Specifications
- Maximum Output: 440 HP at 3300 RPM.
- Displacement: 354 cubic inches (5.813 Liters).
- Configuration: 6-cylinder in-line, 4-stroke diesel.
- Aspiration: Turbocharged and intercooled.
- Dry Weight: Approximately 1164 lbs without gear.
- Alternator: 12V / 125A high-output standard.
- Compliance: EPA Tier 3 and IMO NOx certified.
- Bore and Stroke: 4.17 x 4.33 inches.
Yanmar 6LY440 Full Specs
| Engine type | In-line 6, 4-stroke Diesel |
| Displacement | 5.813L (354 cid) |
| Bore x stroke | 106 x 110 mm |
| Horsepower | 440 hp (324 kW) |
| Rated rpm | 3300 rpm |
| Aspiration | Turbocharged & Intercooled |
| Compression ratio | 16.4:1 |
| Fuel system | Common Rail Injection |
| Recommended fuel | Diesel (EN 590) |
| Ignition/Firing Order | Compression / 1-5-3-6-2-4 |
| Alternator | 12V, 125 Amp |
| Gear ratio/Drive | KMH61A / KMH61V |
| Transmission | Hydraulic Marine Gear |
| Dry weight | 585 kg (1290 lbs) |
| Flywheel housing | SAE 3 |
| Steering | VC10 Electronic Vessel Control |
| Coolant capacity | 20L |
| Exhaust system | Fresh water cooled manifold |
| Cooling system | Heat Exchanger |
| Lubrication | Pressure lubrication |
| Oil capacity | 19L |
| Emissions rating | EPA Tier 3, RCD II, IMO II |
Yanmar 6LY440 Service & Performance Guide
What is the fuel consumption of the Yanmar 6LY440?
The 6LY440 consumes approximately 22.1 gallons per hour at its maximum 3,300 RPM. This 5.8-liter inline-six engine utilizes a high-pressure common-rail system to deliver massive torque for heavy planing hulls. For optimal long-range cruising, maintain 2,500 RPM to significantly improve fuel economy while keeping the boat on plane.
What oil grade is required for the Yanmar 6LY440?
This engine requires 20.1 quarts of SAE 15W-40 oil meeting API Service Class CJ-4 or higher. The large oil volume is necessary to manage heat in the 24-valve cylinder head and turbocharger assembly. Change the oil and all filters every 250 hours to ensure peak performance and internal component protection.
How does the Yanmar 6LY440 cooling system operate?
It features a closed-loop freshwater cooling system with a high-capacity heat exchanger and seawater-cooled aftercooler. This configuration maintains precise intake air temperatures to maximize combustion efficiency and reduce emissions. Inspect the seawater pump and clean the oil cooler matrix annually to ensure the cooling system operates at peak capacity.
What are the electrical system specifications for this engine?
Standard 6LY440 units are equipped with a 12V-125A alternator, fully compatible with modern NMEA 2000 digital backbones. This system provides consistent power for electronic throttle controls and high-definition multifunction displays at the helm. Ensure the battery bank is sized appropriately to handle the high amperage requirements of the pre-heating system.
What are the physical dimensions and weight of the 6LY440?
The 6LY440 has a dry weight of 1,296 lbs, measuring 51.3 inches long and 30.6 inches wide. Its narrow inline-six profile is ideal for twin-engine configurations in sport-fishing vessels with limited beam. Allow for 6 inches of overhead clearance to facilitate valve adjustments and turbocharger inspections during major service intervals.
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