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Yanmar 3YM30AE – Inboard Marine Diesel Engine 29 HP
Yanmar 3YM30AE – 29 HP utilizes a high-torque 3-cylinder marine diesel design with an increased 1.26L displacement to provide elite power-to-weight performance for the 30-foot cruiser class. This model features a specialized high-output alternator and meets RCD2 emission standards, ensuring clean operation and reliable battery charging during long-duration coastal cruising and offshore passages.
- Precision Operational Data: Rated at 29 HP (21.3 kW) at 3200 RPM.
- Internal Engine Configuration Type: Inline 3-Cylinder 1.26L Displacement.
- Advanced Fuel Delivery System: Mechanical Indirect Injection (IDI).
- Recommended Vessel Application Use: Engineered for 30–35 foot sailing yachts.
- Factory Protection Service Plan: Yanmar global marine dealer support.
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Description
Yanmar 3YM30AE 29 HP – Compact Sailboat Auxiliary Engine
Addressing the limited engine room space in 30-35 foot sailboats, the Yanmar 3YM30AE produces a reliable 29 HP at 3200 RPM. This engine is specifically engineered for the American sailing cruiser, offering a lightweight, 3-cylinder design that minimizes the impact on vessel trim while providing sufficient thrust for coastal transits. The naturally aspirated architecture simplifies maintenance for American sailors, making it a favorite for the “DIY” maritime community across the USA coastal sounds and bays.
Fully compliant with USA EPA Tier 3 standards, the 3YM30AE emphasizes clean-burning performance and exceptionally low noise levels on deck. The engine features an oversized 125A alternator as standard, a critical feature for American boaters who rely on house battery banks for autopilots and modern electronics. Its freshwater cooling system is designed with high-grade alloys to resist the corrosive effects of high-salinity waters, ensuring long-term internal protection from the Chesapeake to the Florida Keys.
Core Technical Specifications
- Maximum Output: 29 HP at 3200 RPM.
- Displacement: 77.2 cubic inches (1.266 Liters).
- Configuration: 3-cylinder in-line, 4-stroke diesel.
- Aspiration: Natural aspiration for peak reliability.
- Dry Weight: Approximately 280 lbs without gear.
- Electrical: 12V / 125A heavy-duty alternator.
- Compliance: EPA Tier 3 and RCD2 certified.
- Bore and Stroke: 3.15 x 3.31 inches.
Yanmar 3YM30AE Full Specs
| Engine type | In-line 3, 4-stroke Diesel |
| Displacement | 1.266L (77 cid) |
| Bore x stroke | 80 x 84 mm |
| Horsepower | 29 hp (21.3 kW) |
| Rated rpm | 3200 rpm |
| Aspiration | Naturally Aspirated |
| Compression ratio | 19.1:1 |
| Fuel system | Indirect Injection |
| Recommended fuel | Diesel (ISO 8217 DMA) |
| Ignition/Firing Order | Compression / 1-3-2 |
| Alternator | 12V, 125 Amp |
| Gear ratio/Drive | KM2P-1 / SD25 Saildrive |
| Transmission | Mechanical Cone Clutch |
| Dry weight | 127 kg (280 lbs) |
| Flywheel housing | SAE 5 |
| Steering | Mechanical / Hydraulic compatible |
| Coolant capacity | 4.9L |
| Exhaust system | Mixing elbow (Wet type) |
| Cooling system | Heat Exchanger |
| Lubrication | Forced lubrication |
| Oil capacity | 2.8L |
| Emissions rating | EPA Tier 3, RCD II, BSO II |
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