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The Yanmar 4LV250 (Z) 250HP inboard diesel engine is a high-output marine diesel designed for power recreational boating, repower projects and other suitable marine applications. It combines a 2.755 L four-cylinder diesel platform with direct fuel injection, a Denso common rail system, turbocharging and charge-air cooling to deliver up to 184 kW / 250 mhp at 3,800 rpm. Yanmar lists the 4LV250 (Z) as a recreational-use engine and identifies it as part of the 4LV family, which is designed around strong low-end torque, acceleration, low noise and low vibration.
Performance Engines offers this Yanmar 4LV250 (Z) for customers evaluating a new marine engine for a boat build or repower. The product specification shown on this page matches Yanmar’s published 4LV250 specifications, including the 334 kg dry weight without gear and the 1151 × 755 × 772 mm engine dimensions.
These specifications are based on Yanmar’s current 4LV250 (Z) product information and technical documentation.
The 4LV250 (Z) produces a maximum crankshaft output of 184 kW / 250 mhp at 3,800 rpm. Yanmar’s technical material also lists a continuous-power rating of 168 kW (228 hp metric) at approximately 3,683 rpm. The distinction matters when planning a propulsion system because maximum output and continuous operating power are not the same specification.
Yanmar developed the 4LV family with an emphasis on low-end torque and acceleration. The manufacturer describes the series as a solution for sailing yachts, superyacht tenders, small motor boats and suitable light-duty commercial applications, while the 4LV250 product documentation specifically identifies recreational use. Always confirm the engine’s intended duty cycle, certification requirements and propulsion configuration for the specific vessel before purchase.
The Yanmar 4LV250 uses direct injection with a Denso common rail system. Electronic fuel control allows the engine to manage injection timing and pressure according to operating conditions. Yanmar’s current technical documentation lists variable injection timing and variable injection pressure, with maximum injection pressure of up to 220 MPa.
Common rail injection is particularly relevant when selecting a modern marine diesel because the fuel system is integrated with the engine’s electronic management. This makes correct wiring, sensors, controls and compatible vessel integration important parts of the installation rather than treating the engine as a standalone mechanical package.
The 4LV250 combines a 2.755-liter displacement with four cylinders, a 92 mm bore and 103.6 mm stroke. Its turbocharger and charge-air cooling system support the engine’s high specific output while maintaining the compact four-cylinder architecture of the 4LV platform.
The combination of displacement, turbocharging and common rail injection gives the 4LV250 a power level suitable for vessels that require substantially more propulsion output than smaller Yanmar marine diesel models. For a repower, compare the engine’s output and physical dimensions with the existing engine, shaft or sterndrive arrangement, exhaust routing, cooling requirements and vessel design.
Yanmar specifies a fresh-water cooling system using a centrifugal fresh-water pump together with a rubber-impeller seawater pump. The engine uses an enclosed forced lubrication system. The electrical system includes a 12V starter system and a Denso 12V 130A alternator.
For installation, the cooling-water plumbing, seawater intake, exhaust system, electrical connections and engine monitoring should all be designed around the selected gear or drive package and the vessel manufacturer’s installation requirements. Do not assume that an existing installation can accept the engine without dimensional and systems checks.
| Specification | Yanmar 4LV250 (Z) |
|---|---|
| Engine type | 4-stroke, vertical, water-cooled marine diesel |
| Maximum output | 184 kW / 250 mhp |
| Rated engine speed | 3,800 rpm |
| Continuous power | 168 kW / 228 hp metric at approximately 3,683 rpm |
| Displacement | 2.755 L / 168 cu. in. |
| Cylinders | 4, in-line |
| Bore × stroke | 92 × 103.6 mm / 3.62 × 4.08 in. |
| Combustion system | Direct injection, Denso common rail |
| Aspiration | Turbocharged with charge-air cooler |
| Alternator | Denso 12V – 130A |
| Dry weight without gear | 334 kg / 736 lb |
| Dimensions | 1151 × 755 × 772 mm |
| Controls | Mechanical; optional YANMAR VC20 system |
| Mounting | Flexible mounting |
| Cooling | Fresh-water cooling with heat exchanger and seawater circuit |
| Lubrication | Forced lubrication system |
| Certifications listed by Yanmar | RCD 2, IMO Tier 2, EPA Tier 3, BSO II, EMC, SOLAS |
Yanmar notes that published dimensions can vary depending on the selected marine gear, drive or exhaust configuration. The product page at Performance Engines also notes that the stated length includes the KMH50A marine gear in the relevant configuration.
The 4LV250 is available within a broader Yanmar propulsion system that supports multiple shaft-drive and sterndrive arrangements. Yanmar lists the KMH50A and KMH50V marine gears among compatible 4LV configurations, while the 4LV series is also compatible with the YANMAR ZT370 sterndrive. The exact gear or drive should be selected according to the vessel, shaft line, propeller requirements and installation design.
The engine can be supplied with mechanical controls, while Yanmar also offers its VC20 vessel control system. The VC20 option is relevant when electronic engine and vessel controls are required, particularly where multiple stations or integrated vessel control are part of the installation.
A 250HP marine diesel repower requires more than matching horsepower. Before ordering, compare the existing engine bay dimensions, mounting positions, shaft alignment, transmission ratio, propeller, exhaust arrangement, cooling-water routing, fuel system, electrical system and control architecture.
The 4LV250 weighs approximately 334 kg without gear, so the final installed propulsion package will be heavier once the selected marine gear, exhaust components and accessories are included. Yanmar’s documentation provides different installation configurations and technical drawings, making the exact propulsion package important when confirming fitment.
Yanmar describes the 4LV range as suitable for sailing yachts over 50 feet, superyacht tenders, small motor boats and certain light-duty commercial applications. The 4LV250 product page itself identifies the engine for recreational use, so commercial operators should verify the applicable certification and duty requirements before specifying it.
Before purchasing a Yanmar 4LV250 (Z), confirm the complete engine configuration rather than evaluating the bare engine alone. Verify the required marine gear or drive, control system, shaft arrangement, exhaust elbow, electrical connections, cooling installation and available engine-room space.
Certification is another important consideration. Yanmar’s current 4LV250 (Z) information lists RCD 2, IMO Tier 2, EPA Tier 3, BSO II, EMC and SOLAS certifications, while Yanmar’s product information also specifically notes that the 4LV250 is not EPA Commercial certified. If the engine is intended for a commercial vessel, confirm the certification applicable to the actual operating jurisdiction and vessel use before ordering.
For buyers comparing this engine with other marine diesels, it can also be useful to review the Yanmar 8LV370 370HP inboard diesel engine, the Mercury Diesel inboard engine range, and the Yanmar 4JH110 110HP inboard diesel engine to compare output classes and installation requirements.
The Yanmar 4LV250 (Z) brings 250 mhp of crankshaft output from a 2.755 L four-cylinder marine diesel with common rail injection, turbocharging and charge-air cooling. Its combination of output, compact four-cylinder architecture, modern electronic fuel management and multiple propulsion configurations makes it a relevant option for high-output recreational repowers and new marine installations.
For the correct installation, the engine should be specified as a complete propulsion system rather than as a standalone horsepower figure. Confirm the required gear or drive, controls, dimensions, cooling and exhaust arrangement, certification and vessel compatibility before purchase.
The Yanmar 4LV250 (Z) is rated at 250 mhp / 184 kW at 3,800 rpm at the crankshaft. Yanmar also lists continuous power of approximately 168 kW / 228 hp metric at 3,683 rpm.
The 4LV250 has a 2.755-liter displacement and uses four cylinders arranged in-line. Its bore is 92 mm and stroke is 103.6 mm.
Yes. Yanmar specifies turbocharging with a charge-air cooler, commonly described as turbocharged and intercooled.
The engine uses direct fuel injection with a Denso common rail system. Yanmar’s technical documentation also lists variable electronic injection timing and variable injection pressure.
Yanmar lists the current 4LV250 (Z) at approximately 334 kg / 736 lb dry weight without gear. The final installed propulsion package will weigh more once the marine gear, exhaust and other components are included.
Yanmar identifies the 4LV250 for recreational use and states that the 4LV250 is not EPA Commercial certified. Commercial operators should therefore verify the certification and approval requirements for their specific vessel, jurisdiction and intended duty before purchasing.
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