Yanmar 3JH5E 39HP Marine Diesel Engine | Ultimate Product Guide
The Yanmar 3JH5E is a premium, compact, and highly efficient 3-cylinder marine diesel engine that sets the standard for reliability in the 40-horsepower class. Delivering 39 metric horsepower (29 kW) at 3000 RPM, this engine is engineered for a wide range of vessels, from auxiliary-powered sailboats to light-duty commercial motorboats. As an authorized dealer, X Factors Motorsports offers the genuine Yanmar 3JH5E for sale, backed by expert support and a commitment to competitive pricing.
Renowned for its low fuel consumption and robust direct injection system, the 3JH5E maximizes your cruising range and minimizes operational costs. Its compact and lightweight design (just 423 lbs) simplifies installation in tight engine compartments, while compliance with EPA Tier 3 and EU RCD Tier 2 emissions standards ensures eco-friendly operation. This engine is the definitive choice for mariners who refuse to compromise on performance, durability, and efficiency.
Detailed Technical Specifications
| Feature | Specification |
|---|---|
| Manufacturer | Yanmar Marine |
| Model | 3JH5E |
| Rated Output | 39 mhp (29 kW) @ 3000 RPM |
| Displacement | 1.642 L (100 cu. in.) |
| Cylinders | 3 |
| Bore x Stroke | 88 mm x 90 mm (3.46 in x 3.54 in) |
| Combustion System | Direct Injection |
| Oil Capacity | 5.3 Liters |
| Alternator | 12V – 125A |
| Dry Weight | 192 kg (423 lbs) |
| Dimensions (LxWxH) | 774 mm x 580 mm x 632 mm |
| Certifications | EPA Tier 3, EU RCD Tier 2 |
| Warranty | Yanmar Limited Warranty |
Standard Package Includes
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12V – 125A Alternator
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L-Type Exhaust Mixing Elbow
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Mechanical Throttle Sensor
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Fuel Pre-Filter with Water Separator
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Freshwater Expansion Tank
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Flexible Engine Mounts
Optional Accessories
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High-Riser Mixing Elbow
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NMEA2000 Engine Monitoring System
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Extension Harnesses (3m, 5m, 10m)
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On-Board Spare Parts Kit
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VC10 Vessel Control System
Yanmar 3JH5E vs. Key Competitors: Comparison Table
How does it stack up against other engines in its class?
| Feature | Yanmar 3JH5E | Beta Marine 40 | Volvo Penta D2-40 |
|---|---|---|---|
| Power Output | 39 mhp | 37.5 bhp | 40 bhp |
| Displacement | 1.642L | 1.5L | 1.6L |
| Alternator | 125A (Standard) | 115A (Typical) | 115A (Typical) |
| Emissions | EPA Tier 3, EU RCD II | IMO Tier II | EPA Tier 3, EU RCD II |
| Weight | 423 lbs (Dry) | ~440 lbs | ~430 lbs |
| Key Strength | Global Parts, Compact Design | Custom Marinization | Dealer Network |
| Ideal For | Global Cruisers, OEM Builds | Custom Sailboat Repowers | Volvo-Centric Vessels |
Frequently Asked Questions (FAQ)
Q1: What is the fuel consumption of the Yanmar 3JH5E?
A: While consumption varies with load, the 3JH5E is engineered for exceptional efficiency. At its maximum continuous rating, it consumes approximately 2.6 – 3.0 gallons per hour. At cruising RPM (~2500 RPM), consumption drops significantly, making it extremely economical for long-distance passages.
Q2: Is this a freshwater-cooled engine?
A: Yes. The Yanmar 3JH5E uses a heat exchanger system, meaning raw seawater cools a closed-loop of antifreeze/freshwater that circulates through the engine block. This prevents saltwater from corroding the internal engine passages, greatly extending its life.
Q3: Where can I find the Yanmar 3JH5E service manual?
A: As an authorized Yanmar dealer, X Factors Motorsports provides access to the official Yanmar 3JH5E service manual upon purchase. This is essential for proper maintenance and warranty compliance.
Q4: Is the 125A alternator sufficient for my house bank?
A: The standard 125A alternator is one of the most powerful in its class and is an excellent starting point for most cruising sailboats and powerboats. For vessels with exceptionally high electrical demands, high-output alternator upgrades are available.
Q5: How reliable is the Yanmar 3JH5E for bluewater cruising?
A: Extremely reliable. Yanmar is a global leader for a reason. The 3JH5E’s simple, direct-injection design, proven architecture, and global parts availability make it a top-tier choice for sailors and boaters who venture offshore.
Q6: What is included in the standard package?
A: The engine comes “marinized” and ready to install, including the alternator, mixing elbow, fuel filter/water separator, freshwater cooling kit, and engine mounts. You will need to supply the propeller shaft, propeller, control panel, and wiring harness.
Pros and Cons
Pros:
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Proven Reliability & Global Support: Yanmar’s worldwide dealer network means parts and expertise are available almost anywhere.
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Exceptional Fuel Efficiency: Direct injection technology provides more power with less fuel, extending your range.
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Powerful Standard Alternator: The 125A alternator is a significant advantage for keeping house batteries charged.
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Compact and Lightweight: Its design allows it to fit where other engines cannot, a critical factor for sailboats.
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Emissions Compliance: Meets stringent EPA Tier 3 standards, making it a modern and environmentally conscious choice.
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Simple Maintenance: Designed for easy access to routine service points like oil and fuel filters.
Cons:
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Premium Price Point: As a top-tier brand, Yanmar often commands a higher initial cost than some smaller marinizers.
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Electronic Control Option: Full engine monitoring (e.g., NMEA 2000) is an optional extra, not standard.
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Sailor-Specific Needs: Some sailors prefer engines based on older industrial blocks for their mechanical simplicity and DIY repairability, which differs from Yanmar’s modern, integrated design.
Conclusion & Best Applications
The Yanmar 3JH5E is not just an engine; it is a investment in peace of mind for your vessel. It represents the ideal blend of modern efficiency, compact power, and unparalleled global support.
You should choose this engine if:
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You are repowering a sailboat (30-45 ft) or a small powerboat and need dependable auxiliary power.
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Global travel is a possibility, and you need a brand with worldwide parts and service support.
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Fuel efficiency and electrical output are high priorities for your cruising style.
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You value a modern, emissions-compliant engine from an industry-leading manufacturer.
For boat owners who demand the best combination of performance, efficiency, and legendary Yanmar reliability, the 3JH5E is the clear and compelling choice.
Disclaimer: Engine selection is critical. Always consult with a marine engineer or experienced installer to ensure the Yanmar 3JH5E is appropriately sized for your vessel’s hull, weight, and propeller requirements. Professional installation is required to ensure safety, performance, and warranty validity. Specifications and included components are subject to change by the manufacturer; always confirm details with your authorized dealer at the time of purchase.
Why Choose X Factors Motorsports?
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Authenticity: Authorized dealer for genuine Yanmar products.
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Expert Support: Get expert advice to ensure the perfect engine for your needs.
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Competitive Pricing: We work to provide the best value on the market.
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Global Shipping: We can ship anywhere you need your engine to go.
Contact X Factors Motorsports today for a competitive quote on the Yanmar 3JH5E and power your next adventure with confidence.
