The Yanmar 6AY Series (including variants such as 6AYAM-ET, 6AYM-WST, 6AYM-WET, and 6AYM-WGT) are 6-cylinder, in-line, 4-stroke, vertical, water-cooled diesel engines, purpose-built for heavy-duty marine propulsion in commercial vessels. They feature turbocharging and intercooling (with keel cooling or heat exchanger options) and direct injection, delivering robust performance and reliability. The engines utilize a 24 V electric starting system (7 kW) and meet IMO Tier II (with some variants also EPA Tier III compliant), ensuring adherence to global emission standards. They are engineered with an SAE #0 flywheel housing and SAE #18 flywheel, weigh approximately 2,295–2,365 kg (dry, without marine gear), and their dimensions are roughly 1,949 × 1,274 × 1,544 mm (for certain models) or 2,000 × 1,305 × 1,431 mm for others

ENGINE SPECIFICATIONS
Rated Output              Rated Speed       Emissions          
670 kW / 911 mhp        1938 RPM            EPA Tier 2