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Yanmar 6LY3-UTP – Inboard Diesel Engine 380 HP
Yanmar 6LY3-UTP – 380 HP features a refined high-torque boat motor design based on the 5.8L block, specifically tuned for semi-displacement hulls and heavy cruising. This 380 HP model focuses on a broad, flat torque curve and thermal durability, utilizing electronic engine management to ensure optimal fuel efficiency and reduced vibration levels during long-range coastal navigation or commercial utility operations.
- Transom/Engine Integration Specification: Rated at 380 HP (279 kW) at 3300 RPM.
- Core Engine Mechanical Design: Inline 6-Cylinder 5.81L Turbo-Aftercooled.
- High Precision Fuel Induction: Electronic Fuel Injection with Digital Monitoring.
- Optimal Marine Vessel Compatibility: Perfect for semi-planing trawlers and motor sailers.
- Long Term Warranty Coverage: Yanmar global marine service network support.
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Description
Yanmar 6LY3-UTP 380 HP – Reliable High-Torque Inboard Diesel
Eliminating the lag associated with traditional mechanical diesel engines is the core engineering objective of the Yanmar 6LY3-UTP. Producing 380 HP at 3300 RPM, this turbocharged 6-cylinder powerhouse features electronic control to balance air-fuel ratios for optimized torque curves during heavy acceleration. For American boat owners, this means more power at the low end for getting heavy-laden fishing boats on plane quickly in the choppy waters common in USA coastal inlets.
Fully compliant with EPA Tier 3 regulations, the 6LY3-UTP emphasizes operational clean-burning efficiency and reduced maintenance intervals. The engine is built on the legendary 6LY block architecture, known in the USA maritime community for its mechanical longevity and narrow profile that simplifies repowering projects. Its high-capacity 80A alternator is designed to maintain house battery banks, ensuring that essential American marine electronics remain fully operational during long offshore transits.
Core Technical Specifications
- Maximum Output: 380 HP at 3300 RPM.
- Displacement: 354 cubic inches (5.813 Liters).
- Configuration: 6-cylinder in-line, water-cooled diesel.
- Aspiration: Wastegate turbocharged and intercooled.
- Dry Weight: Approximately 1411 lbs with gear.
- Fuel System: Electronic control common-rail injection.
- Compliance: EPA Tier 3 and USCG compliant.
- Bore and Stroke: 4.17 x 4.33 inches.
Yanmar 6LY3-UTP Full Specs
| Engine type | In-line 6, 4-stroke Diesel |
| Displacement | 5.813L (354 cid) |
| Bore x stroke | 106 x 110 mm |
| Horsepower | 380 hp (279 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-UTP Service & Performance Guide
What is the fuel consumption of the Yanmar 6LY3-UTP?
The 6LY3-UTP consumes roughly 19.1 gallons per hour at its full 3,300 RPM rating. This 5.8-liter engine utilizes electronic control to optimize the fuel injection timing for 380 HP output. For the most efficient coastal cruising, maintain 2,400 RPM to reduce hourly burn while staying on plane.
What oil grade is required for the Yanmar 6LY3-UTP?
This model requires 20.1 quarts of SAE 15W-40 oil meeting API Service Class CI-4 or higher. The large oil sump is necessary to manage the thermal loads generated by the electronic-controlled turbocharger system. Perform oil changes every 250 hours and use genuine Yanmar filters to ensure proper bypass pressure.
How does the Yanmar 6LY3-UTP cooling system operate?
It utilizes a freshwater cooling circuit with a dedicated seawater heat exchanger and integrated intercooler. The system is designed to provide uniform cooling to the six-cylinder block, preventing localized overheating in the rear cylinders. Check the sacrificial zinc anodes monthly to protect the heat exchanger from galvanic corrosion.
What are the electrical system specifications for this engine?
The engine includes a 12V-80A alternator as standard, supporting the electronic engine management system and basic house loads. This system provides reliable starting power even in colder climates through a heavy-duty starter motor. Verify that the battery bank meets the minimum 600 CCA requirement for consistent electronic actuator performance.
What are the physical dimensions and weight of the 6LY3-UTP?
The dry weight is 1,411 lbs, with dimensions of 51.2 inches in length and 27.6 inches in width. Its relatively low profile is ideal for installation under flush cockpits in express cruisers. Ensure the engine mounts are adjusted annually to maintain proper shaft alignment and minimize cabin vibration.
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