Description

Yanmar 6EY17W Marine Engine

The Yanmar 6EY17W marine engine is a robust medium-speed diesel propulsion solution engineered for commercial vessels that demand dependable performance, fuel efficiency, and long operational life. Designed with a 6-cylinder inline configuration and advanced combustion technology, this engine delivers consistent power output across a wide operating range, making it suitable for workboats, cargo vessels, fishing boats, ferries, and other heavy-duty marine applications.

At the core of the 6EY17W is a 4-stroke diesel platform with a cylinder bore of 170 mm and a piston stroke of 230 mm, providing a displacement of approximately 31.3 liters. This large displacement contributes to strong torque characteristics, stable operation under load, and excellent propulsion efficiency even in demanding sea conditions. Depending on the rating configuration, the engine offers continuous power outputs ranging from approximately 374 kW to 837 kW (508 to 1,138 hp) at rated speeds between 1350 and 1450 rpm.

The engine incorporates turbocharging and charge-air cooling technology to optimize combustion efficiency and improve fuel economy while maintaining low exhaust emissions. Compliance with international marine emission standards such as IMO Tier II ensures environmentally responsible operation without compromising performance. Advanced fuel injection systems with high injection pressure and optimized spray patterns enhance combustion stability, reduce smoke, and improve overall efficiency across varying load conditions.

Durability and serviceability are key design priorities. The 6EY17W features heavy-duty components, large-diameter intake and exhaust valves, and a reinforced engine structure to support continuous commercial operation. Maintenance access is simplified through practical design elements such as inspection windows, individually removable cylinder heads, and cartridge-type filters, allowing easier onboard servicing and reduced downtime. These features contribute to lower lifecycle costs and improved vessel availability.

The engine can be paired with compatible marine gear systems, including reduction gear options that support fixed-pitch propeller configurations and flexible installation requirements. Its moderate weight and compact footprint relative to its power output also make it adaptable for various vessel layouts, from new builds to repowering projects.

Overall, the Yanmar 6EY17W stands out as a reliable and efficient propulsion engine built for continuous commercial use, combining proven engineering, fuel economy, and long-term durability to meet the demands of modern marine operations.