Yanmar 6LY2A-STP 440HP Inboard Diesel Marine Engine
Charter sportfishers running full-throttle tournament runs rely on a Yanmar 6LY2A-STP diesel powerplant, which pushes 440 HP via mechanical distributor injection across a wastegated 5.813L block with 24V 80-Amp charging at 1179 lbs.
- Wastegated turbocharger prevents excessive manifold pressure
- 5.813L displacement produces 440 crankshaft horsepower
- Mechanical injection eliminates complex electronic failures
- Intercooled intake preserves dense combustion air
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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).
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.
Warranty and Support
Yanmar protects this mechanical engine package with a 2-Year Limited Warranty covering major internal mechanical assemblies. 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 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.
Product Specifications
Yanmar 6LY2A-STP 440HP Inboard Diesel Marine Engine Specs
| Brand | Yanmar |
|---|---|
| Full Model SKU/Code | 6LY2A-STP |
| Country of Origin | Japan |
| Engine Family/Series | 6LY2A Series Heavy-Duty Marine Line |
| Engine Type / Configuration | Inline 6-Cylinder, 4-Stroke, Vertical Marine Diesel |
| Fuel Type | Marine Diesel |
| Displacement | 5.813 Liters / 5813 cc |
| Horsepower Output | 440 HP / 324 kW (At Crankshaft) |
| Full Throttle RPM Range | 3300 RPM |
| Aspiration / Induction System | Turbocharged with Wastegate and Fresh Water Cooled Intercooler |
| Fuel Injection System | Direct Mechanical Injection via High-Pressure In-line Distributor Pump |
| Bore x Stroke | 106.0 mm x 110.0 mm |
| Compression Ratio | 15.5:1 |
| Cooling System Method | Fresh Water Cooling via Heat Exchanger with Raw Water Internal Loops |
| Alternator Output | 80 Amps / 24 Volts Standard Configuration Array |
| Recommended Fuel Grade | Diesel Fuel No. 2-D, Cetane Rating Min 45 |
| Emission Compliance | IMO Tier I, BSO II Approved Base |
| Dry Weight | 535 kg / 1179 lbs (Engine only mass profile) |
| Application | High-performance planing hulls, sportfishing express boats, charter sportfishers, and coastal pilot crafts demanding high power-to-weight mechanical reliability (32-52 ft hulls) |
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