The Yanmar 6LF550 is a 6-cylinder, 4-stroke, vertical, water-cooled diesel engine designed for marine applications. With a displacement of 6.728 liters and a bore and stroke of 104 mm x 132 mm, it delivers a maximum output of 404 kW (550 mhp) at 3000 rpm. This engine features turbocharging and intercooling for enhanced performance. The direct injection system utilizes a Bosch common rail system for efficient fuel delivery, and the engine is equipped with an electric starting system (12V - 3kW or 24V - 4kW). Cooling is provided by fresh water and seawater pumps, while an enclosed, forced lubrication system ensures smooth operation. The engine weighs 780 kg (1720 lbs) and has dimensions of 1519 x 893 x 881 mm. It complies with emission standards such as EU RCD 2, IMO Tier 2, and EPA Tier 3, making it suitable for various marine applications.

ENGINE SPECIFICATIONS
Rated Output          Rated Speed       Emissions          
404 kW / 803 mhp    3000 RPM             EPA Tier 3