Yanmar 6LY2A-STP 440HP Inboard Diesel Marine Engine

Description

High-performance planing hulls and coastal pilot craft demanding high mechanical power-to-weight ratio can utilize the Yanmar 6LY2A-STP. Generating 440 horsepower at 3300 RPM from a 5.813-liter inline 6-cylinder block, this engine relies on a high-pressure mechanical distributor fuel pump. Turbocharging with a wastegate and water-cooled intercooler delivers rapid boost buildup while keeping intake temperatures low.

Freshwater heat exchanger cooling protects internal waterways from raw seawater scale. The engine includes a 24V 80-amp electrical charging package, an oil sump with forced lubrication, and a dry weight of 535 kg (1179 lbs).

Key Specifications of the Yanmar 6LY2A-STP Inboard Marine Engine

• The 5.813-liter 6-cylinder engine produces 440 horsepower at 3300 RPM, offering high mechanical power density for fast planing vessels.
• Direct mechanical fuel injection via a high-pressure distributor pump offers reliable, simple fuel metering without electronic control modules.
• Wastegated turbocharging with a water-cooled intercooler optimizes intake boost pressure, delivering rapid acceleration across mid-range speeds.
• Freshwater heat exchanger thermal management isolates the cylinder block from raw seawater, extending engine component service life.
• A commercial 24V 80-amp alternator array supplies robust electrical charging power for heavy DC equipment and battery banks.
• A low dry weight of 535 kg delivers an outstanding power-to-weight ratio, preserving vessel speed and stern trim under load.

Engine Performance and Engineering

Wastegated turbocharging and mechanical direct injection give this Yanmar inboard engine rapid speed capabilities. Pressure lubrication safeguards moving parts during continuous high-speed runs, while freshwater cooling maintains thermal stability.

Why Choose the Yanmar 6LY2A-STP Inboard Marine Engine

Operators select the 6LY2A-STP marine engine for its light 535 kg dry weight and strong 440 horsepower mechanical output. Its mechanical distributor pump fuel system avoids digital failure points, making it an ideal choice for remote offshore sportfishing and charter vessels. Closed heat exchanger cooling and 24V electronics complete the package.

Mounting and Compensation Considerations

Verify engine bed stringer alignment and flexible mount drops to ensure accurate shaft coupling setup. Confirm raw water sea strainers and exhaust risers meet the flow demands of a 440 horsepower wastegated turbo engine.

Warranty and Support

Yanmar protects this mechanical engine package with a 2-Year Limited Warranty covering major internal mechanical assemblies. Mulmarine.com provides pre-purchase technical guidance and freight shipping customer support. Prior to freight shipment, staff verify the crated engine package against the confirmed order details. Review the applicable warranty information on Mulmarine.com before completing your order.

Before Ordering the Yanmar 6LY2A-STP Inboard Marine Engine

Measure your engine compartment dimensions to ensure proper clearance around the wastegated turbo and intercooler. Confirm your transmission gear ratio, shaft coupling size, and 24V battery supply lines before ordering.