The Yanmar 6LT640 Marine Diesel Engine is a high-performance, 6-cylinder, 4-stroke engine delivering 641hp at 1900 rpm. Designed for commercial and heavy-duty marine vessels, this engine is built to provide powerful, reliable performance for various marine applications, including fast patrol boats, fishing vessels, and workboats. Featuring turbocharging and intercooling, the 6LT640 ensures optimal power delivery while maintaining fuel efficiency.
With common rail direct injection (CR) technology, this engine offers precise fuel control, resulting in better fuel economy, lower emissions, and smooth, efficient power output. The freshwater cooling system with a heat exchanger provides consistent engine temperature control, enhancing performance and engine longevity in harsh marine environments.
This robust marine engine complies with the latest IMO Tier II emissions standards, ensuring minimal environmental impact without compromising power. Its compact design and reliable performance make it an excellent choice for demanding marine conditions.
Technical Specifications:
- Engine Model: 6LT640
- Engine Type: 6-cylinder, 4-stroke, vertical water-cooled diesel engine
- Displacement: 17.22 litres
- Bore x Stroke: 135 mm x 150 mm
- Power Output: 641hp (471 kW) at 1900 rpm
- Compression Ratio: 15.3:1
- Fuel System: Common rail direct injection (CR)
- Turbocharged: Yes, with intercooling
- Cooling System: Freshwater cooling with heat exchanger
- Alternator Output: 24V – 60A
- Lubrication System: Forced lubrication by gear pump
- Oil Capacity: 68 litres
- Starting System: Electric start
- Direction of Rotation: Counterclockwise (viewed from flywheel)
- Weight: 2,500 kg (dry weight)
- Gearbox Options: Various options available based on the application
- Exhaust System: Water-cooled exhaust manifold
- Emission Compliance: IMO Tier II compliant
Key Features:
- Turbocharging with Intercooling: Enhances power and fuel efficiency, delivering high output in a compact design.
- Common Rail Direct Injection (CR): Ensures precise fuel control, leading to improved fuel economy and reduced emissions.
- Freshwater Cooling System: Protects the engine from corrosion and ensures optimal operating temperatures.
- Robust Design: Built to withstand demanding marine environments, suitable for commercial and heavy-duty applications.
- Low Emissions: Meets IMO Tier II regulations, ensuring environmentally-friendly operation.
- High Power Output: 641hp provides sufficient power for high-speed and heavy-duty marine vessels.
Yanmar is a globally recognized leader in marine diesel engines, offering durable and efficient solutions for commercial and recreational vessels. The Yanmar 6LT640 is part of Yanmar’s high-performance engine lineup, delivering powerful, reliable, and environmentally-friendly performance.
