6LY400
New generation common rail inline 6 with electronic controls delivering refined, efficient high-performance power with VC20 joystick compatibility.
Specifications
Rated Output
400 MHP (294.2 kW)
Displacement
5.81L
Cylinders
6 cylinders
Bore x Stroke
94 mm x 140 mm
Compression Ratio
16.5:1
Max RPM
3300 rpm
Alternator
12V 125A
Dry Weight
585 kg
Dimensions (L x W x H)
1172 x 706 x 810 mm
Fuel Consumption
80 L/hr @ full load
Fuel System
Denso common rail direct injection
Cooling
Fresh water cooling with heat exchanger
Transmission
KMH61A reverse gear
Specifications are indicative and may vary by configuration, drive option and model year. Contact us to confirm exact figures for your application against the latest Yanmar datasheet.
Key Features
Typical Applications
Why Choose the 6LY400?
The 6LY400 is a high-output 5.81L 6-cylinder marine engine, well suited to luxury motor yachts, performance cruisers, light duty commercial.
Proven Reliability
Backed by over 100 years of Yanmar engineering excellence. Every engine is built to deliver thousands of hours of dependable operation in the harshest marine environments, giving you complete peace of mind whether cruising Port Phillip Bay or crossing Bass Strait.
Expert Local Service
Mariner Engineering provides factory-trained servicing from our Spotswood workshop. As an authorised Yanmar dealer, we carry genuine parts in stock and offer scheduled maintenance programs and warranty servicing for boat owners across Melbourne and beyond.
Fuel Efficiency
Advanced common rail fuel injection technology delivers optimum power while minimising fuel consumption. Lower fuel costs mean more time on the water, and reduced emissions demonstrate your commitment to protecting the marine environment.
The 6LY400 is a testament to Yanmar's commitment to producing the world's finest compact diesel engines. Founded in 1912, Yanmar pioneered the small diesel engine and has been at the forefront of marine propulsion innovation ever since. The 6LY400 delivers 400 MHP from a 5.81L, 6-cylinder configuration, offering an exceptional power-to-weight ratio.
Yanmar engines are manufactured in Japan using precision engineering processes that ensure exceptional build quality and long service life. The 6LY400 features advanced noise and vibration damping for a quieter, more comfortable experience on the water. With a global dealer network and comprehensive parts availability through Power Equipment Australia, owning a Yanmar means you'll never be far from expert support.
As Melbourne's trusted Yanmar dealer, Mariner Engineering can help you select the right engine configuration for your vessel, provide professional installation, commission the engine to factory specifications, and support you with ongoing maintenance throughout the life of your boat. Contact our team to discuss how the 6LY400 can transform your boating experience.
Authorised Yanmar dealer
Genuine factory products, warranty and back-up — not a grey importer.
Factory-trained technicians
Diagnostics, servicing and commissioning from our Spotswood, Melbourne workshop.
Genuine parts in stock
OEM parts and consumables on the shelf to keep your boat on the water.
Supply, install & support
Repower specialists serving boat owners across Port Phillip Bay and beyond.
Other engines in the 6LY-CR Series
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Complete Service & Support
Every 6LY400 from Mariner Engineering comes with access to our full service workshop in Spotswood, Melbourne. We offer scheduled maintenance, warranty servicing, genuine Yanmar parts, repowering, and expert technical support for boat owners across Port Phillip Bay and beyond.