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The Yanmar 3YM30AE 29.1HP inboard diesel engine is a compact three-cylinder marine diesel designed for smaller sailboats and pleasure craft. Yanmar specifies 21.3 kW / 29.1 mhp at 3,200 rpm from a 1.266-liter engine with natural aspiration and indirect injection. The 3YM30AE uses mechanical engine management, fresh-water cooling with a heat exchanger and a 12V 125A alternator.
Performance Engines offers this Yanmar 3YM30AE for marine propulsion applications where its power output, dimensions and mechanical configuration match the vessel requirements. Before ordering, confirm the exact marine gear or saildrive, engine-bed dimensions, propeller system, exhaust arrangement and control configuration required for the installation.
Yanmar lists the 3YM30AE at 21.3 kW / 29.1 mhp at 3,200 rpm. The manufacturer’s operation documentation also gives a separate continuous crankshaft output of 19.4 kW / 26.4 hp metric at 3,101 rpm, while the fuel-stop rating is 21.3 kW / 29.1 hp metric at 3,200 rpm.
These are manufacturer test ratings rather than a guarantee of boat speed. Actual propulsion performance depends on vessel displacement, hull design, propeller selection, transmission or saildrive ratio, loading and operating conditions.
The 3YM30AE uses a 1.266-liter three-cylinder diesel configuration with an 80 mm bore and 84 mm stroke. It is an in-line, vertical, four-stroke, water-cooled marine diesel engine.
Yanmar’s documentation identifies the combustion system as indirect injection with an in-line pump. The engine is naturally aspirated and uses mechanical engine management, keeping the configuration within Yanmar’s mechanical YM series rather than its common-rail engine range.
The 3YM30AE is naturally aspirated, with no turbocharger or intercooler listed in Yanmar’s specifications. Fuel is delivered through an indirect-injection system using an in-line injection pump.
For repower planning, this configuration should be evaluated together with the vessel’s existing fuel system, controls, exhaust, cooling circuit and propulsion drive. Do not assume that accessories or controls from another Yanmar engine will automatically be compatible.
The 3YM30AE uses fresh-water cooling with a heat exchanger. The standard engine package includes an expansion tank for the fresh-water cooling system, while the marine installation also requires the appropriate seawater circuit and exhaust components.
Cooling-water routing, seawater intake, strainer, hoses, heat exchanger and exhaust mixing arrangement should be installed and maintained according to Yanmar’s documentation for the exact propulsion configuration.
Yanmar specifies a 12V 125A alternator for the current 3YM30AE. The technical documentation also lists electric starting at 12V with a 1.4 kW starter.
The alternator output can be relevant for vessels operating navigation electronics, refrigeration, lighting, communications equipment and other electrical loads. Battery capacity, cable sizing, grounding and charging requirements should nevertheless be designed around the complete vessel electrical system.
| Specification | Yanmar 3YM30AE |
|---|---|
| Engine type | In-line, 4-stroke, vertical, water-cooled marine diesel |
| Maximum rated crankshaft output | 21.3 kW / 29.1 mhp |
| Rated engine speed | 3,200 rpm |
| Continuous crankshaft output | 19.4 kW / 26.4 hp metric at 3,101 rpm |
| Displacement | 1.266 L / 77 cu. in. |
| Cylinders | 3, in-line |
| Bore × stroke | 80 × 84 mm / 3.15 × 3.31 in. |
| Combustion system | Indirect injection, in-line pump |
| Aspiration | Natural |
| Engine management | Mechanical |
| Starting system | 12V electric, 1.4 kW starter |
| Cooling | Fresh-water cooling with heat exchanger |
| Alternator | 12V – 125A |
| Lubrication | Enclosed, forced lubrication system |
| Dry weight without gear | 127 kg / 280 lb |
| Dimensions | 715 × 485 × 545 mm |
| Flywheel housing | SAE #6 |
| Controls | Mechanical |
| Certifications | RCD 2, EPA Tier 3, EPA Tier 3C, BSO II, EMC |
Yanmar’s current information identifies the KM2P-1 marine gear and SD25 saildrive as compatible propulsion arrangements for the 3YM30AE. The engine can therefore be configured for a shaft-drive or saildrive installation depending on the vessel and selected package.
Yanmar states that the published length includes the KM2P-1 marine gear and the published height includes a U-type exhaust elbow. Dimensions can change with different gears or exhaust-elbow configurations, so the exact technical drawing should be used for installation planning.
The current Yanmar specification lists the 3YM30AE at 715 mm long × 485 mm wide × 545 mm high, with a dry weight of 127 kg / 280 lb without gear.
These figures need to be interpreted according to the propulsion configuration. Before repowering a boat, measure engine-bay length, width and height, mounting locations, shaft centerline and service clearances. Also check exhaust routing, fuel connections, seawater plumbing and control-cable access.
Yanmar’s standard 3YM30AE package includes an L-type exhaust mixing elbow, 12V 125A alternator, B20 panel, flexible mounts, fresh-water expansion tank, electric stop solenoid and belt safety cover.
The exact supplied equipment should be confirmed for the engine package being ordered. Vessel-specific installation components may need to be selected separately.
Yanmar lists optional accessories including a high-riser mixing elbow, 4 m or 6 m extension wire harness, dual harness for a second station, TFX sidemount control head, hot-water kit, 50 mm extension saildrive leg, SD25 propeller cone nut kit and onboard spare-parts kit.
Accessory selection should match the vessel layout and the selected marine gear or saildrive. Confirm compatibility before purchasing additional controls, harnesses, exhaust equipment or drive components.
The Yanmar YM series is designed for smaller sailboats and pleasure craft, and the 3YM30AE is the highest-output model in the current three-model YM range. The series covers the 2YM15, 3YM20 and 3YM30AE at 14, 21 and 29.1 mhp respectively.
Whether the 3YM30AE is appropriate for a particular boat depends on displacement, hull characteristics, required propulsion power, propeller, transmission or saildrive and applicable vessel requirements. The 29.1 mhp rating should be checked against the boat manufacturer’s recommended engine range.
When replacing an existing marine diesel, compare the complete installation rather than horsepower alone. Important checks include engine-bed dimensions, mount positions, shaft centerline, transmission ratio, propeller diameter and pitch, exhaust routing, seawater intake, fuel lines, electrical connections and control cables.
The selected marine gear or saildrive can affect the final installation dimensions and propulsion characteristics. Confirm the exact Yanmar installation drawing and drive ratio before modifying the vessel.
The 3YM30AE uses a mechanical engine configuration, but correct installation remains essential to long-term operation. Provide appropriate access for oil and filter service, cooling-system inspection, belt inspection, fuel-system maintenance and exhaust-system checks.
Yanmar’s documentation also specifies lubricant requirements for the engine. Use the current Yanmar operation and maintenance documentation for the exact oil grade, service intervals, coolant requirements and other maintenance procedures rather than relying on generic marine-diesel service information.
The 3YM30AE combines 29.1 mhp of marine diesel output with a three-cylinder naturally aspirated design, indirect injection, mechanical controls, fresh-water cooling and a 12V 125A alternator. Its compact dimensions and availability with marine gear or SD25 saildrive make it a relevant option for suitable small-boat propulsion applications.
For a new installation or repower, the important checks include engine power, physical fit, marine gear or saildrive compatibility, shaft or drive alignment, cooling and exhaust installation, electrical requirements and control configuration.
Yanmar lists the 3YM30AE at 21.3 kW / 29.1 mhp at 3,200 rpm. Yanmar’s operation documentation separately lists a continuous crankshaft output of 19.4 kW / 26.4 hp metric at 3,101 rpm.
The 3YM30AE has three in-line cylinders and 1.266 liters of displacement.
No. The 3YM30AE is naturally aspirated. Yanmar’s specifications do not list a turbocharger or intercooler for this model.
The engine uses indirect injection with an in-line pump. Yanmar’s operation documentation describes the combustion system as a swirl pre-combustion chamber.
Yes. The engine uses fresh-water cooling with a heat exchanger, with an expansion tank included in the standard engine package.
Yanmar lists a dry weight of 127 kg / 280 lb without gear. The complete installed propulsion package will weigh more once the selected marine gear or saildrive and associated equipment are included.
The current Yanmar specification lists a 12V 125A alternator. The vessel’s complete charging system should still be designed around its actual battery bank and electrical loads.
Yanmar identifies the KM2P-1 marine gear and SD25 saildrive among compatible propulsion arrangements. Confirm the exact configuration and installation drawing before ordering.
If you are looking for a compact 29HP-class marine diesel for a suitable sailboat or pleasure-craft installation, the Yanmar 3YM30AE provides a three-cylinder naturally aspirated configuration with indirect injection, mechanical controls, fresh-water cooling and a 12V 125A alternator.
Before purchasing, confirm the vessel’s required propulsion power, engine-bay dimensions, shaft or saildrive arrangement, transmission, propeller, controls and installation requirements. For buyers comparing Yanmar marine diesel engines, Performance Engines also offers the Yanmar 2YM15 14HP, Yanmar 3YM20 21HP and Yanmar 4JH110 110HP inboard diesel engines.
Explore more inboard engines at Performance Engines.
