YANMAR 6HYM-WET 441 kW (600 mhp)

The YANMAR 6HYM-WET is a high-performance, heavy-duty marine diesel engine delivering 441 kW approximately 600 mhp engineered for demanding commercial and industrial marine applications. Designed with reliability, efficiency, and durability in mind, this engine is ideal for workboats, ferries, patrol vessels, and other medium to large vessels requiring consistent power under prolonged operation.

Featuring a 6-cylinder in-line configuration with advanced turbocharging and intercooling, the 6HYM-WET ensures optimized combustion, excellent fuel efficiency, and reduced emissions. The engine robust construction allows for long service intervals and straightforward maintenance, even in harsh maritime environments.

YANMAR proven engineering ensures smooth operation with low vibration, reliable torque delivery across the rpm range, and excellent responsiveness under load. Compact yet powerful, this engine delivers high performance without compromising space, making it suitable for vessels where engine room layout is critical.

Applications:

• Workboats and tugs

• Ferries and passenger vessels

• Patrol and coast guard boats

• Offshore support vessels

Highlights:

• Power Output: 441 kW (≈ 600 mhp)

• 6-cylinder inline marine diesel engine

• Turbocharged and water-cooled for optimal efficiency

• Robust, durable construction for heavy-duty use

• Smooth operation with low vibration and reliable torque

• Easy maintenance with accessible service points

Technical Specifications

General Engine Data

• Engine Model: 6HYM-WET

• Engine Type: 4-stroke, water-cooled marine diesel engine with direct injection

• Cylinder Configuration: 6 in-line

• Total Displacement: ~8.4 L

• Bore × Stroke: 115 × 125 mm

• Aspiration: Turbocharged and water-cooled intercooler

• Compression Ratio: 16.0:1

• Flywheel & Housing: SAE standard

• Dry Weight: ~1,050 kg

• Cooling System: Freshwater cooling with heat exchanger; seawater-cooled circuit

Performance

• Rated Power Output: 441 kW (≈ 600 mhp)

• Rated Engine Speed: 2,300 rpm

• Torque: ~2,200 Nm @ 1,600 rpm

• Emission: Meets IMO Tier II / EPA Tier II standards (depending on year/model)

Operation & Use

• Designed for medium to large commercial vessels and workboats

• Provides consistent torque and smooth operation under heavy loads

• Easy maintenance with accessible service points

• Durable construction ensures long service life in harsh marine environments

• Optimized for fuel efficiency and reliability