Yanmar 6LY2A-STP Marine Inboard Diesel Engine 440hp
$48,088.00
- Description
Description
Yanmar 6LY2A-STP Marine Inboard Diesel Engine 440HP
The Yanmar 6LY2A-STP 440HP marine inboard diesel engine delivers 440 metric horsepower (324 kW) at 3,300 rpm from a 5.813-litre inline six-cylinder platform. Mechanical fuel injection, turbocharging and intercooling combine in a propulsion engine for recreational vessels and carefully specified marine repower projects. YANMAR Marine International
Request Yanmar 6LY2A-STP 440HP pricing from MSS Motorsports UG for your proposed installation. Whether you need an engine-only replacement or an engine and gearbox package, specify your vessel and existing drivetrain to establish the required supply scope.
Six-Cylinder Power with Mechanical Controls
The Yanmar 6LY2A-STP 440HP uses direct injection through an in-line fuel injection pump, with mechanical engine management. Its freshwater cooling system, 12V electrical equipment and inline-six configuration provide clear reference points when planning a replacement installation.
Key features include:
- 5.813-litre displacement: A six-cylinder, four-stroke marine diesel platform.
- Mechanical engine controls: Suitable for assessment alongside an existing cable-operated installation.
- Turbocharged and intercooled induction: Supports the manufacturer’s published power output.
- 12V electrical configuration: Published equipment includes an 80A alternator.
- 535 kg engine-only dry weight: Gearbox, fluids and installation components increase the installed weight. YANMAR Marine International
For a motor cruiser or recreational sportfishing boat, assess the engine against hull displacement, cruising requirements and propeller demand. Reusing existing components requires confirmation of their condition and compatibility.
Technical Specifications
| Specification | Manufacturer-Published Details |
|---|---|
| Engine model | Yanmar 6LY2A-STP |
| Maximum crankshaft output, ISO 3046 | 324 kW / 440 MHP at 3,300 rpm |
| Maximum crankshaft output, ISO 8665 | 315 kW at 3,300 rpm |
| Published continuous crankshaft rating | 257 kW / 350 MHP at 3,100 rpm |
| Displacement | 5.813 litres |
| Configuration | Inline six-cylinder, four-stroke diesel |
| Bore × stroke | Approximately 106 × 110 mm |
| Fuel injection | Direct injection with in-line pump |
| Engine management | Mechanical |
| Aspiration | Turbocharged and intercooled |
| Cooling | Liquid cooling with heat exchanger |
| Alternator | 12V / 80A |
| Dry weight without gearbox | 535 kg |
| Intended use in operation manual | Recreational craft |
Specifications follow Yanmar’s published product documentation and operating manuals. yanmar.com
Power Ratings and Operating Duty
MHP means metric horsepower. Yanmar publishes the 440 MHP maximum rating under ISO 3046 conditions, with fuel entering the injection pump at 25°C. Its specification sheet also lists a separate ISO 8665 rating at a 40°C fuel-inlet temperature. Compare engines using the same reference conditions. yanmar.com
The published 350 MHP continuous rating at 3,100 rpm is separate from maximum output. Yanmar’s recreational operating instructions limit maximum-throttle operation to less than 5% of total engine time. A continuous power figure should be read together with the applicable duty instructions and installation approval. yanmar.com
For a lower-output alternative in the same family, compare the Yanmar 6LY2A-UTP 370HP marine diesel engine.
Gearbox Options and Drivetrain Matching
Yanmar’s documentation includes the KMH60A marine gearbox, featuring an 8-degree down-angle arrangement and a hydraulic multi-disc clutch. It also lists ZF280-1 and ZF280-1A transmission configurations. yanmar.com
The selected gearbox and reduction ratio must match engine input speed, propeller requirements and shaft geometry. An existing gearbox should be assessed before it is retained in a repower.
Review the official Yanmar 6LY2A-UTP/STP specification sheet for reference. Installation planning requires drawings for the exact engine, gearbox and exhaust arrangement.
Establish Your Engine Supply Package
When comparing a Yanmar 6LY2A-STP 440HP engine for sale, request an itemised quotation confirming:
- Engine condition, serial number and operating hours where applicable.
- Available service history, rebuild records and inspection or running-test evidence.
- Gearbox model and ratio, instruments, wiring, mounts and supplied accessories.
- Warranty provider, coverage, exclusions and commissioning requirements.
- Availability, packing, dispatch estimate and delivery charges.
For repower projects, provide photographs of the current engine and gearbox identification plates. Your installer should also review engine beds, exhaust routing, cooling-water supply and service access.
Frequently Asked Questions
Does the Yanmar 6LY2A-STP 440HP use mechanical fuel injection?
Yes. Yanmar specifies direct injection through an in-line pump and mechanical engine management. YANMAR Marine International
Is 440HP the continuous operating rating?
No. The 440 MHP figure is maximum output under the stated rating conditions. Yanmar separately publishes 350 MHP at 3,100 rpm as continuous crankshaft power; the recreational duty instructions still apply. yanmar.com
Are the gearbox and warranty included?
These depend on the offered engine and supply package. Request written confirmation of all included equipment and applicable warranty terms.
Request Your Yanmar 6LY2A-STP 440HP Quote
Contact MSS Motorsports UG for a Yanmar 6LY2A-STP quotation with your vessel make and model, existing engine, gearbox model and reduction ratio, intended operating profile and purchase timing. Include your billing and delivery addresses to request pricing for the specified equipment and transport to your destination.
