Yanmar 3YM30AE – Inboard Marine Diesel Engine 29 HP
An expanded 1.266L displacement profile gives the Yanmar 3YM30AE diesel powerplant reliable low-end grunt in tight engine compartments, driving SD25 saildrives or KM2P-1 cone clutches with 125 Amps charging at 280 lbs.
- 1.266L displacement delivers steady idling torque
- 125-Amp alternator rapidly charges domestic batteries
- SD25 saildrive ensures streamlined hull integration
- 280-lb lightweight build minimizes transom settling
$2,034.90
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With 29 hp at 3,200 rpm, the Yanmar 3YM30AE uses a naturally aspirated 1.266L inline three-cylinder marine diesel layout with indirect injection. Its 19.1:1 compression ratio and ISO 8217 DMA diesel requirement define the stated fuel-system configuration. A mechanical cone-clutch transmission, SAE 5 flywheel housing, and KM2P-1 or SD25 saildrive compatibility establish the documented propulsion interfaces.
The 280-pound dry engine uses a 12V 125-amp alternator, heat-exchanger cooling with 4.9L coolant capacity, and forced lubrication holding 2.8L oil. The wet mixing elbow forms part of the exhaust arrangement. Listed EPA Tier 3, RCD II, and BSO II ratings, plus mechanical or hydraulic steering compatibility, provide further specification context.
Why Choose the Yanmar 3YM30AE Marine Diesel Engine
The 3YM30AE marine diesel engine combines 29 hp at 3,200 rpm with a naturally aspirated 1.266L three-cylinder indirect-injection configuration. Buyers comparing compact propulsion packages can assess its 12V 125-amp alternator, mechanical cone-clutch transmission, SAE 5 flywheel housing, and KM2P-1 or SD25 saildrive compatibility. The 280-pound dry weight and listed emissions ratings provide additional integration data.
Warranty and Support
Warranty coverage for this legacy engine should be confirmed against the current Yanmar policy applicable to its purchase date, installation status, and operating market. provides product-information support before purchase and assistance with order-related questions. Review current warranty eligibility and coverage details on before placing your order.
Before Ordering the Yanmar 3YM30AE Marine Diesel Engine
Before ordering, verify engine-bed dimensions, mount locations, SAE 5 flywheel-housing compatibility, and the selected KM2P-1 or SD25 saildrive arrangement. Confirm the vessel supports ISO 8217 DMA diesel, cooling-water intake, wet-exhaust routing, 12V charging wiring, mechanical or hydraulic controls, ventilation, shaft or saildrive alignment, and professional propulsion installation.
Product Specifications
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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