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Volvo Penta D6-340 – Inboard Diesel Engine 340 HP
Volvo Penta D6-340 – 340 HP utilizes a high-performance 6-cylinder propulsion architecture optimized for the latest generation of semi-displacement hulls. This 5.5L model is engineered to provide a smooth powerband and is fully compatible with Volvo Penta’s Glass Cockpit system, allowing for integrated engine monitoring and precision digital navigation on modern bridge decks.
- Engine Power Specification: Rated at 340 HP (250 kW) at 3400 RPM.
- Core Engine Mechanical Design: Inline 6-Cylinder 5.5L Displacement.
- High Precision Fuel Induction: Common Rail with multi-injection technology.
- Optimal Marine Vessel Compatibility: Perfect for mid-sized offshore cruisers and workboats.
- Long Term Warranty Coverage: Volvo Penta 2+3 year limited warranty coverage.
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Description
Volvo Penta D6-340 340 HP – High-Efficiency Marine Inboard
Eliminating the noise and vibration typically associated with high-displacement marine engines is the core achievement of the Volvo Penta D6-340. Producing 340 HP at 3500 RPM, this engine is specifically engineered for American cruisers and trawlers that prioritize passenger comfort and operational economy. The refined common-rail injection system ensures optimal fuel atomization, providing USA boaters with a smoke-free transom and a quiet cockpit environment during long-distance voyages across the Great Lakes or the Atlantic Intracoastal Waterway.
Adhering to strict USA EPA Tier 3 regulations, the D6-340 utilizes advanced electronic management to maintain peak performance while minimizing its environmental footprint. The engine is designed for easy serviceability, with all maintenance points conveniently located for accessibility in the compact engine rooms of American-built yachts. Its robust 115-amp alternator is specifically sized to handle the house-load demands of modern American marine electronics, ensuring house battery banks remain fully charged during offshore transits.
Core Technical Specifications
- Maximum Output: 340 HP at 3500 RPM.
- Displacement: 336 cubic inches (5.5 Liters).
- Configuration: In-line 6-cylinder, 4-stroke diesel.
- Aspiration: Turbocharged and intercooled.
- Dry Weight: Approximately 1300 lbs (excluding gear).
- Electrical: 12V / 115A marine alternator.
- Compliance: EPA Tier 3 and USCG compliant.
- Bore and Stroke: 4.06 x 4.33 inches.
Volvo Penta D6-340 Full Specs
| Engine type | In-line 6, 4-stroke Diesel |
| Displacement | 5.5L (336 cid) |
| Bore x stroke | 103 x 110 mm |
| Horsepower | 340 hp (250 kW) |
| Rated rpm | 3400 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/150A or 24V/80A |
| Gear ratio/Drive | HS85A / ZF Compatible |
| Transmission | Hydraulic Marine Gear |
| Dry weight | 690 kg (1521 lbs) |
| Flywheel housing | SAE 4 |
| Steering | Electronic Vessel Control (EVC) |
| Coolant capacity | 16L |
| Exhaust system | Water cooled manifold |
| Cooling system | Heat Exchanger Cooling |
| Lubrication | Pressure feed (Wet Sump) |
| Oil capacity | 20L |
| Emissions rating | EPA Tier 3, IMO II, RCD II |
Volvo Penta D6-340 Service & Performance Guide
What is the fuel consumption of the Volvo Penta D6-340?
The D6-340 consumes about 17.4 gallons per hour at its full 3,400 RPM rating. This 5.5-liter block is tuned for high durability in mid-sized cruisers and sport-fishing boats. Operating at a 2,600 RPM cruise provides an excellent balance of torque and fuel economy for long-distance coastal passages.
What oil grade is required for the Volvo Penta D6-340?
This model requires 21.1 quarts of Volvo VDS-4.5 specialized marine diesel engine oil. Consistent oil changes are vital to prevent carbon buildup in the common-rail system and protect the overhead valve train. Change the oil and replace both filters every 200 hours and always use genuine Volvo filters for optimal protection.
How does the Volvo Penta D6-340 cooling system operate?
It utilizes a thermostatically controlled freshwater cooling system with a dedicated seawater heat exchanger and oil cooler. The freshwater loop protects the internal engine components from saltwater corrosion while providing heat for onboard systems. Check the seawater strainer daily to ensure unrestricted flow during high-load operations.
What are the electrical system specifications for this engine?
The engine includes a 12V-115A alternator designed to support the integrated EVC system and charge large house battery banks. This robust electrical output allows for the operation of extensive navigation equipment without requiring an auxiliary generator. Verify that the starter motor cables are correctly sized to handle the initial amperage draw.
What are the physical dimensions and weight of the D6-340?
The dry weight is 1,301 lbs, with dimensions of 47.2 inches in length and 38.2 inches in height. Its robust cast-iron construction is built for long-term durability in high-demand marine environments. Maintain a rigid engine mounting system to minimize the natural vibrations associated with an inline-six diesel configuration.
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