Yanmar 6LY440 – Marine Diesel Engine 440 HP

Description

Delivering 440 horsepower at 3300 RPM directly to your vessel drive system is straightforward with the Yanmar 6LY440. This 5.813-liter inline 6-cylinder diesel motor utilizes high-pressure common-rail fuel injection, offering smooth combustion and responsive mid-range acceleration for sportfishing boats and fast planing cruisers. An integrated turbocharged and intercooled air system optimizes intake density while keeping exhaust emissions exceptionally clean.

Thermal control relies on a closed freshwater heat exchanger loop that isolates internal cylinder waterways from raw seawater. Operating with an SAE 3 flywheel housing, the engine features a 12V 125-amp alternator, VC10 electronic vessel controls, and a compact dry weight of 585 kg (1290 lbs) without marine gear.

Key Specifications of the Yanmar 6LY440 Marine Diesel Engine

• The 5.813-liter 6-cylinder diesel block generates 440 horsepower at 3300 RPM, giving planing hulls heavy-duty propulsive thrust.
• Common-rail direct fuel injection delivers precise fuel pressure management, which drastically lowers mechanical combustion noise and transom smoke.
• Turbocharged and water-cooled intercooled air induction maximizes oxygen density within cylinders, ensuring quick throttle response during vessel acceleration.
• A closed freshwater heat exchanger cooling system prevents internal scale buildup by isolating engine metallurgy from raw seawater.
• An integrated 12V 125-amp alternator supplies consistent battery charging output to support onboard navigation displays and auxiliary DC gear.
• The standard SAE 3 flywheel housing pairs seamlessly with KMH61A down-angle or KMH61V V-drive hydraulic marine transmission units.

Helm Use and Readability

Smooth engine balancing and electronic throttle management define the operational feel of this Yanmar inboard engine. The inline 6-cylinder firing order minimizes hull vibration, while VC10 electronic vessel control integration outputs real-time engine health data directly to bridge screens.

Why Choose the Yanmar 6LY440 Marine Diesel Engine

Captains select the 6LY440 marine engine for its light 585 kg dry weight and potent 440 horsepower output. Its 5.813-liter common-rail architecture delivers fast planing performance without typical mechanical diesel exhaust smoke. The combination of an SAE 3 flywheel housing, 125-amp alternator, and VC10 digital controls makes it a top-tier repower selection.

Mounting and Compensation Considerations

Verify engine bed stringer alignment and flexible mount drops to ensure precise shaft coupling positioning. Confirm that raw water intake sea strainers and exhaust mixing elbows match the cooling flow requirements for a 440 horsepower turbocharged engine block.

Warranty and Support

Yanmar backs this engine with a 2-Year Limited Recreational Warranty covering major internal mechanical components against manufacturing defects. Mulmarine.com provides product-information support before purchase and assistance with order-related questions. Prior to freight shipment, staff verify the crated engine package against the confirmed order details. Review warranty eligibility and current coverage details on Mulmarine.com before placing your order.

Before Ordering the Yanmar 6LY440 Marine Diesel Engine

Measure your engine compartment hatch dimensions to confirm fitting clearance for a 5.813-liter inline 6-cylinder block. Confirm your transmission gear ratio, propeller shaft coupling bolt layout, and battery cable sizing before finalizing your order.