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VETUS VD4.120 – Marine Diesel Engine 122 HP
VETUS VD4.120 – 122 HP features a refined high-torque boat motor design based on the legendary Hyundai 4-cylinder common-rail platform. This 122 HP diesel utilizes a Variable Geometry Turbocharger (VGT) and a 16-valve DOHC head to deliver explosive mid-range grunt, offering the smoke-free operation and NMEA 2000® connectivity required for modern semi-displacement coastal cruisers and rapid patrol craft.
- Transom/Engine Integration Specification: Rated at 122 HP (89.7 kW) at 3800 RPM.
- Core Engine Mechanical Design: Inline 4-Cylinder 2.5L Turbocharged Aftercooled.
- High Precision Fuel Induction: Electronic Common-Rail Direct Injection.
- Optimal Marine Vessel Compatibility: Perfect for semi-displacement motorboats and fast tenders.
- Long Term Warranty Coverage: VETUS 5-year limited engine warranty coverage.
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Description
VETUS VD4.120 122 HP – Durable Auxiliary Propulsion Diesel
Bridging the gap between sailboat auxiliaries and motor yacht propulsion, the VETUS VD4.120 produces 122 HP at 2300 RPM through a robust, naturally aspirated 4-cylinder design. This Deutz-based engine is a cornerstone of the American cruising community, known for its longevity and simple mechanical operation in the most demanding offshore conditions. For the American sailor or trawler owner, the VD4.120 offers a fuel-efficient power plant that thrives under high-load transits, ensuring a stable and reliable journey across US coastal waters.
Adhering to USA EPA Tier 3 emission requirements, the VD4.120 focuses on mechanical longevity and clean combustion for a superior environment on deck. The engine features a robust heat exchanger and a dedicated freshwater cooling circuit, protecting internal components from the corrosive high-salinity air common in the Florida Keys and the Pacific Northwest. Its high-output electrical system ensures house battery banks remain charged, providing the power required for modern American marine electronics and onboard comfort systems.
Core Technical Specifications
- Maximum Output: 122 HP at 2300 RPM.
- Displacement: 246 cubic inches (4.04 Liters).
- Configuration: 4-cylinder in-line, 4-stroke diesel.
- Aspiration: Natural aspiration for peak simplicity.
- Dry Weight: Approximately 992 lbs (excluding gear).
- Electrical: 12V / 80A heavy-duty alternator.
- Compliance: EPA Tier 3 and USCG compliant.
- Bore and Stroke: 3.97 x 4.96 inches.
VETUS VD4.120 Full Specs
| Engine type | 4-Cylinder In-line (Hyundai Base) |
| Displacement | 3.9L (3907 cc) |
| Bore x stroke | 104 x 115 mm |
| Horsepower | 122 hp (89.7 kW) |
| Rated rpm | 2400 rpm |
| Aspiration | Turbocharged Aftercooled |
| Compression ratio | 17.6:1 |
| Fuel system | Common Rail (HPCR) |
| Recommended fuel | Diesel (EN 590) |
| Ignition/Firing Order | Compression / 1-3-4-2 |
| Alternator | 12V, 140 Amp |
| Gear ratio/Drive | Shaft Drive compatible |
| Transmission | ZF / Technodrive Hydraulic |
| Dry weight | 435 kg (959 lbs) |
| Flywheel housing | SAE 3 |
| Steering | Hydraulic / Electronic compatible |
| Coolant capacity | 16L |
| Exhaust system | Water cooled manifold |
| Cooling system | Indirect cooling (Heat exchanger) |
| Lubrication | Forced lubrication |
| Oil capacity | 12L |
| Emissions rating | EPA Tier 3 / IMO II / RCD II |
VETUS VD4.120 Service & Performance Guide
What is the fuel consumption of the VETUS VD4.120?
The VD4.120 consumes approximately 6.6 gallons per hour at its full 2,400 RPM rating. This 4.5-liter engine is tuned for maximum longevity and low vibration in displacement vessels. Operating at a 1,700 RPM cruise significantly lowers noise levels and provides the best fuel economy for long-duration passages under motor.
What oil grade is required for the VETUS VD4.120?
This model requires 13.7 quarts of SAE 15W-40 oil meeting API Service Class CI-4. The mechanical fuel injection system is rugged and tolerant, but clean oil is vital for protecting the overhead valve train. Replace the oil and the spin-on filter every 250 hours to maintain factory specifications and prevent internal wear.
How does the VETUS VD4.120 cooling system operate?
It utilizes a thermostatically controlled freshwater cooling system with a seawater-cooled heat exchanger. This ensures the engine operates at a consistent temperature, which reduces exhaust smoke and improves fuel efficiency. Periodically inspect the seawater pump impeller and the raw water strainer to prevent accidental overheating.
What are the electrical system specifications for this engine?
Standard units are equipped with a 12V-120A alternator, providing massive charging capacity for a 122 HP engine. This ensures that house batteries are quickly replenished even during short periods of motoring. Maintain the alternator belt tension to prevent slipping during high electrical loads from navigation suites.
What are the physical dimensions and weight of the VD4.120?
The dry weight is 1,069 lbs, measuring 36.6 inches in length and 34.1 inches in height. Its robust and simple mechanical design makes it a favorite for commercial workboats and heavy cruising yachts. Allow for at least 6 inches of service clearance for easy access to the fuel-water separator and oil dipstick.
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