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Volvo Penta D6-300 – Inboard Diesel Engine 300 HP
Volvo Penta D6-300 – 300 HP utilizes a robust 5.5L inline-six marine diesel architecture designed for high-load durability in displacement and semi-displacement hulls. The six-cylinder configuration provides inherent primary balance for ultra-smooth operation, while the large displacement allows for sustained high-torque output at lower RPMs, making it the premier choice for long-range trawlers and commercial utility vessels.
- External Engine Dimensions: Inline 6-Cylinder 5.5L Displacement.
- Standard Engine Block Architecture: Cast Iron Block with Freshwater Cooling.
- Intelligent Fuel Management System: Common Rail Fuel Injection with EVC monitoring.
- Vessel Hull Integration Guide: Best for displacement trawlers and heavy cruisers.
- Reliability And Service Plan: Volvo Penta international marine service support.
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Description
Volvo Penta D6-300 300 HP – Durable Displacement Hull Diesel
Solving the need for a fuel-efficient and long-lasting auxiliary power source, the Volvo Penta D6-300 delivers 300 HP at 3300 RPM. This engine is a favorite for American trawler owners and long-distance cruisers who value steady, reliable propulsion over extreme top-end speed. The 5.5-liter 6-cylinder architecture is built to withstand high-duty cycles, ensuring that USA boaters have a dependable partner for the Great Loop or other extended maritime adventures where engine uptime is critical for safety and comfort.
Meeting strict USA EPA Tier 3 emission requirements, the D6-300 utilizes high-precision fuel mapping to ensure clean, odor-free operation in sensitive American coastal environments. The engine features an integrated oil cooler and a robust freshwater cooling system designed to maintain stable thermal profiles during continuous high-load transits. For the American operator, the engine’s digital networking capabilities provide the data accuracy required for modern navigation, ensuring a high level of situational awareness on the glass bridge helm.
Core Technical Specifications
- Maximum Output: 300 HP at 3300 RPM.
- Displacement: 336 cubic inches (5.5 Liters).
- Configuration: In-line 6-cylinder, 4-stroke diesel.
- Aspiration: Turbocharged and aftercooled.
- Dry Weight: Approximately 1300 lbs (excluding gearbox).
- Electrical: 12V / 115A alternator standard.
- Compliance: EPA Tier 3 and RCD2 certified.
- Bore and Stroke: 4.06 x 4.33 inches.
Volvo Penta D6-300 Full Specs
| Engine type | In-line 6, 4-stroke Diesel |
| Displacement | 5.5L (336 cid) |
| Bore x stroke | 103 x 110 mm |
| Horsepower | 300 hp (221 kW) |
| Rated rpm | 3300 rpm |
| Aspiration | Turbocharged with Aftercooler |
| Compression ratio | 17.5:1 |
| Fuel system | Common Rail Fuel Injection |
| Recommended fuel | Diesel (EN 590 / ASTM D975) |
| Ignition/Firing Order | Compression / 1-5-3-6-2-4 |
| Alternator | 12V/115A or 24V/80A |
| Gear ratio/Drive | HS63AE / HS80AE |
| Transmission | Hydraulic Marine Gear |
| Dry weight | 656 kg (1446 lbs) |
| Flywheel housing | SAE 4 |
| Steering | Electronic Vessel Control (EVC) |
| Coolant capacity | 16L |
| Exhaust system | Water cooled manifold |
| Cooling system | Heat Exchanger / Keel Cooling |
| Lubrication | Pressure feed (Wet Sump) |
| Oil capacity | 20L |
| Emissions rating | EPA Tier 3, IMO II, RCD II |
Volvo Penta D6-300 Service & Performance Guide
What is the fuel consumption of the Volvo Penta D6-300?
The D6-300 consumes roughly 15.3 gallons per hour at its maximum 3,500 RPM. As a lower-stress version of the 5.5-liter block, it offers exceptional longevity for commercial or heavy recreational use. For the best cruising efficiency, 2,200 RPM is the recommended speed to optimize fuel burn while maintaining vessel momentum.
What oil grade is required for the Volvo Penta D6-300?
The D6-300 requires 21.1 quarts of SAE 15W-40 oil meeting Volvo VDS-4.5 specifications. Proper lubrication helps manage thermal loads and protects the high-pressure common-rail pump and injectors. Perform oil changes every 200 hours and always replace both the lube oil filter and the bypass filter to ensure peak filtration.
How does the Volvo Penta D6-300 cooling system operate?
It employs a closed-circuit freshwater system with a high-capacity heat exchanger and integrated oil cooler. The system is designed to provide uniform cooling to all six cylinders, preventing localized hot spots under heavy loads. Regularly inspect the seawater pump impeller and ensure the raw water intake is free from obstructions.
What are the electrical system specifications for this engine?
This model comes standard with a 12V-115A alternator, providing plenty of power for modern marine electronics and refrigeration systems. The charging system is fully compatible with Volvo Penta EVC for real-time electrical system monitoring. Verify that all ground connections are secured to the engine block to avoid ECU signal errors.
What are the physical dimensions and weight of the D6-300?
The dry weight is 1,279 lbs, measuring 47.2 inches in length and 38.2 inches in height. Its robust construction provides a superior power-to-weight ratio compared to older marine diesel designs. Ensure the engine room ventilation exceeds 500 CFM to keep the intake air temperatures within specification.
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