Yanmar 6LY440 – Marine Diesel Engine 440 HP

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.