VETUS VD4.120 – Marine Diesel Engine 122 HP

With 122 hp at 2400 rpm, the VETUS VD4.120 is a four-cylinder inline marine diesel engine with 3.9 L displacement and turbocharged aftercooling. Its common-rail fuel system is specified for EN 590 diesel, while the indirect cooling system uses a heat exchanger and water-cooled exhaust manifold. The SAE 3 flywheel housing, hydraulic transmission compatibility, and shaft-drive configuration are key checks for a repower or new inboard installation.

A 12V, 140-amp alternator supports the engine’s charging output, and the listed dry weight is 435 kg. The engine uses forced lubrication with a 12 L oil capacity and holds 16 L of coolant. Hydraulic or electronic steering compatibility is listed, while the specified emissions ratings are EPA Tier 3, IMO II, and RCD II.

Why Choose the VETUS VD4.120 Marine Diesel Engine

The VD4.120 marine diesel engine suits installations requiring a 122 hp output at 2400 rpm, a turbocharged aftercooled four-cylinder configuration, and common-rail diesel fueling. Compared with a smaller naturally aspirated engine, it has greater listed displacement and alternator capacity. Its SAE 3 flywheel housing, shaft-drive compatibility, hydraulic transmission options, and heat-exchanger cooling arrangement provide defined parameters for drivetrain and machinery-space planning.

Warranty and Support

VETUS provides its 5 PLUS engine warranty program, consisting of 36 months of coverage for material and construction defects for eligible non-commercial pleasure-craft use, plus a subsequent 24-month limited coverage period for specified engine parts, subject to applicable operating-hour limits and warranty conditions. provides pre-purchase product guidance and order-related customer support. Review the applicable warranty information on before completing your order.

Before Ordering the VETUS VD4.120 Marine Diesel Engine

Confirm that your vessel installation supports the 435 kg dry weight, 3.9 L engine configuration, shaft-drive arrangement, SAE 3 flywheel housing, and compatible ZF or Technodrive hydraulic transmission. You should verify engine-bed dimensions, propeller-shaft alignment, cooling and wet-exhaust routing, EN 590 diesel supply, 12V charging connections, and steering-system requirements before purchase.