Yanmar 6LY400 Marine Inboard Diesel Engine 400hp Common Rail
$46,824.00
- Description
Description
Yanmar 6LY400 Marine Inboard Diesel Engine 400HP Common Rail
The Yanmar 6LY400 400HP common rail marine diesel engine combines 5.813-litre, six-cylinder power with electronic engine management, turbocharging and intercooling. Its published maximum crankshaft output of 294kW / 400MHP at 3,300rpm places it within Yanmar’s fourth-generation 6LY-CR marine propulsion range. yanmar.com
For a cruising boat, motor yacht or repower project, the 6LY400 offers a combination of common-rail fuel control, responsive performance and a narrow in-line engine layout. Request a quotation from MSS Motorsports UG for the engine, marine transmission and helm equipment required for your installation.
Common-Rail Technology and Responsive Performance
The 6LY400 brings several useful features to a modern inboard propulsion package:
- Denso common-rail direct injection: Electronic control manages injection timing and pressure as operating conditions change.
- Torque and acceleration: Yanmar designs the 6LY-CR platform to deliver strong torque across its operating range and responsive acceleration.
- Cruising comfort: The range incorporates measures to reduce noise and vibration, supporting a more comfortable onboard environment.
- Marine-specific construction: A purpose-built Yanmar marine block and narrow engine profile support new installations and carefully planned repowers. yanmar.com
Actual vessel speed, fuel consumption and sound levels depend on the hull, loading, propeller, drivetrain and installation. Compare performance requirements against your normal cruising conditions.
Technical Specifications
| Specification | Manufacturer reference |
|---|---|
| Engine model | Yanmar 6LY400 |
| Engine type | Four-stroke, vertical, water-cooled diesel |
| Maximum crankshaft output | 294kW / 400MHP |
| Rated engine speed | 3,300rpm |
| Cylinder arrangement | Six cylinders in line |
| Displacement | 5.813 litres |
| Bore × stroke | 106 × 110mm |
| Fuel system | Denso common-rail direct injection |
| Engine management | Electronic |
| Aspiration | Turbocharged and intercooled |
| Starting system | 12V electric starter, 2.5kW |
| Published alternator reference | 12V, 125A |
| Cooling | Freshwater engine circuit with seawater heat exchange |
| Reference dry weight | 585kg without marine gearbox |
| Reference dimensions, L × W × H | 1,440 × 748.5 × 773.8mm* |
MHP denotes metric horsepower. The published length is measured with a KMH61A-2 gearbox and high-riser exhaust elbow. These dimensions describe that reference configuration; they should not be treated as bare-engine dimensions. yanmar.com
Confirm the supplied equipment and use the correct installation drawing when checking fit. See the official Yanmar 6LY400 specifications for manufacturer reference information.
Marine Gearbox and Shaft-Drive Options
Yanmar literature documents KMH61A2 down-angle, KMH61V2 V-drive and ZF280-1A transmission arrangements for the 6LY-CR platform. These hydraulic multi-disc gearbox options have different installation geometry and ratio choices. yanmar.com
For a Yanmar 6LY400 engine and gearbox package, confirm the exact transmission model, reduction ratio, shaft rotation and coupling. Reusing an existing gearbox requires an installer’s assessment of compatibility, torque capacity, alignment and propeller loading.
If comparing more output within the same common-rail family, review the Yanmar 6LY440 440HP marine diesel engine alongside your vessel’s propulsion requirements.
Electronic Controls and Helm Integration
The 6LY400 uses electronic engine management and electronic controls. Yanmar currently lists VC20/VC30 vessel-control systems and optional equipment such as additional helm stations, joystick control and NMEA2000 engine monitoring. YANMAR Marine International
Specify the control system, displays, harness lengths and number of stations required. Joystick functions and monitoring equipment depend on the complete installation and must be identified individually in the quotation.
Plan Your Marine Repower
Start with the vessel’s make, model, loaded displacement, target cruising speed and current propulsion arrangement. Have your installer review engine-bed positions, shaft centreline, service access, ventilation, cooling-water supply and exhaust routing.
A shared Yanmar family name does not establish replacement compatibility. Identify the complete model and serial number of your existing engine so the proposed installation can be assessed accurately.
Pricing, Condition and Included Equipment
Request a Yanmar 6LY400 price against the configuration you intend to purchase. An itemised quotation should identify:
- Engine condition, serial number and documented hours where applicable.
- Gearbox, ratio, coupling and included installation components.
- Controls, displays, wiring harnesses and accessories.
- Available service records, inspection findings and testing evidence.
- Written warranty terms, packing, transport costs and estimated dispatch timing.
For used or reconditioned equipment, request a written description of completed work and supporting records. Confirm availability, included components and warranty eligibility for the specific engine offered.
Frequently Asked Questions
Does the Yanmar 6LY400 use common-rail injection?
Yes. It uses Denso common-rail direct injection with electronic engine management.
Does 400HP mean unrestricted continuous commercial operation?
No. Maximum output does not establish an unrestricted duty rating. Confirm the supplied engine’s approved application, operating limits and relevant certification for your intended use.
Are the gearbox and helm controls included?
Inclusion depends on the quotation. Confirm the transmission, control system, displays, harnesses and installation accessories in writing.
Request Your Yanmar 6LY400 Quote
Contact MSS Motorsports UG for a Yanmar 6LY400 quotation with your vessel details, current engine, gearbox model and ratio, required helm stations, intended use, expected annual hours and purchase timing. Include your billing and delivery addresses to request equipment pricing and transport costs.
