Yanmar 3JH5E – Inboard Marine Diesel Engine 39 HP
Internal heat exchangers isolate corrosive saltwater on this Yanmar 3JH5E tournament engine, which relies on a naturally aspirated 1.642L 3-cylinder block to generate 39 HP and 80 Amps charging across an SD50 saildrive at 381 lbs.
- 1.642L block produces 39 smooth horsepower
- Naturally aspirated design eliminates turbocharger maintenance
- 80-Amp alternator maintains starting battery voltage
- Forced lubrication protects internal crankshaft journals
- Heat exchanger system isolates raw corrosive seawater
$2,385.95
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With 39 hp at 3,000 rpm, the Yanmar 3JH5E uses a naturally aspirated 1.642L inline three-cylinder marine diesel configuration with indirect injection. Its 18.4:1 compression ratio and ISO 8217 DMA diesel requirement define the stated fuel-system setup. A mechanical cone-clutch transmission, SAE 4 flywheel housing, and KM35A2, KM35P, or SD50 drive compatibility establish the documented propulsion interfaces.
The 381-pound dry engine uses a 12V 80-amp alternator, heat-exchanger cooling with 4.5L coolant capacity, and forced lubrication holding 5.0L oil. A wet mixing elbow forms part of the specified exhaust system. Listed EPA Tier 3, RCD I, and BSO II ratings, along with mechanical or hydraulic steering compatibility, provide further technical context.
Why Choose the Yanmar 3JH5E Marine Diesel Engine
The 3JH5E marine diesel engine combines 39 hp at 3,000 rpm with a naturally aspirated 1.642L three-cylinder indirect-injection configuration. Buyers comparing mechanical propulsion packages can assess its 12V 80-amp alternator, SAE 4 flywheel housing, mechanical cone-clutch transmission, and KM35A2, KM35P, or SD50 drive options. The 381-pound dry weight and listed emissions ratings provide additional integration data.
Warranty and Support
This model is eligible for Yanmar’s 3-Year Extended Limited Warranty program for first retail purchasers of qualifying engines bought on or after July 1, 2015, when used only for private and recreational purposes. For product details and order support, offers assistance before your purchase is placed. Current coverage information and warranty eligibility are available for review on before ordering.
Before Ordering the Yanmar 3JH5E Marine Diesel Engine
Before ordering, verify engine-bed dimensions, mount locations, SAE 4 flywheel-housing compatibility, and the selected KM35A2, KM35P, or SD50 drive 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 3JH5E Full Specs
| Engine type | In-line 3, 4-stroke Diesel |
|---|---|
| Displacement | 1.642L (100 cid) |
| Bore x stroke | 88 x 90 mm |
| Horsepower | 39 hp (28.7 kW) |
| Rated rpm | 3000 rpm |
| Aspiration | Naturally Aspirated |
| Compression ratio | 18.4:1 |
| Fuel system | Indirect Injection |
| Recommended fuel | Diesel (ISO 8217 DMA) |
| Ignition/Firing Order | Compression / 1-3-2 |
| Alternator | 12V, 80 Amp |
| Gear ratio/Drive | KM35A2 / KM35P / SD50 |
| Transmission | Mechanical Cone Clutch |
| Dry weight | 173 kg (381 lbs) |
| Flywheel housing | SAE 4 |
| Steering | Mechanical / Hydraulic compatible |
| Coolant capacity | 4.5L |
| Exhaust system | Mixing elbow (Wet type) |
| Cooling system | Heat Exchanger |
| Lubrication | Forced lubrication |
| Oil capacity | 5.0L |
| Emissions rating | EPA Tier 3, RCD I, BSO II |
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