The Craftsman CM4.80 is a modern, compact, and highly reliable 4-cylinder marine diesel engine designed to deliver dependable power for a wide range of vessels. Producing 80 horsepower, this engine strikes the perfect balance between performance and efficiency, making it an excellent choice as an auxiliary power plant for sailboats (30-45 feet), primary propulsion for small commercial workboats, launches, and fishing vessels.
Engineered for the harsh marine environment, the CM4.80 features a robust freshwater cooling system (heat exchanger) that protects the engine block from corrosive seawater, significantly extending its service life. Its compact dimensions and adaptable mounting system facilitate straightforward installations and repower projects. With a focus on simplicity, serviceability, and low fuel consumption, this engine is built for mariners who value durability and ease of maintenance.
Whether you’re motorsailing through a calm, maneuvering in a tight harbor, or requiring dependable power for day-to-day work, the Craftsman CM4.80 provides smooth, torque-rich operation. It represents a solid investment in proven diesel technology, ensuring years of faithful service on the water.
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Technical Specifications
| Specification Category | Detail |
|---|---|
| Model | Craftsman CM4.80 |
| Type | 4-cylinder, 4-stroke, water-cooled diesel |
| Displacement | 2.2 L / 134 cu. in. (Estimated, confirm with manufacturer) |
| Max Output (hp/kW) | 80 HP / 59 kW |
| Max Rated RPM | ~3600 RPM (Typical for this class) |
| Cooling System | Heat Exchanger (Freshwater cooling with seawater circuit) |
| Fuel System | Direct Injection |
| Alternator Output | 55-115 A (Depending on configuration) |
| Rotation | Standard clockwise (from flywheel end) / Counter-rotation available |
| Gear Ratio | Various gear ratios available (e.g., 2:1, 2.5:1) to match propeller requirements |
| Dry Weight (Approx.) | ~300 kg / 660 lbs (Engine & gear approx.) |
| Emissions Compliance | EPA Tier 3 / IMO / RCD (Confirm specific standard) |
Comparison Table: CM4.80 vs. Key Competitors
| Feature | Craftsman CM4.80 | Yanmar 4JH80 | Beta Marine 85 |
|---|---|---|---|
| Base Engine Block | Modern industrial diesel platform | Yanmar | Kubota industrial |
| Power Output | 80 HP | 80 HP | ~85 HP |
| Cooling System | Freshwater Cooling (Standard) | Freshwater Cooling (Standard) | Freshwater Cooling (Standard) |
| Parts Network | Growing global network | Extensive global marine network | Strong, based on industrial Kubota parts |
| Primary Market | Value-oriented sailboats, workboats, repowers | OEM sailboats & premium repowers | Sailboat repower market |
| Key Differentiator | Competitive pricing, modern design | Brand reputation, extensive dealer support | Customizable marinization packages |
Frequently Asked Questions (FAQs)
Q1: Is the Craftsman CM4.80 suitable for a sailboat repower project?
A: Yes, it is an excellent candidate. Its compact size, competitive weight, and available power output make it well-suited for repowering sailboats in the 30 to 45-foot range. It is crucial to ensure the engine bed, shaft alignment, and propeller sizing are correctly matched to the new engine. For a complete guide, see our blog: Step-by-Step Guide to Marine Diesel Engine Repower.
Q2: What is the typical fuel consumption of the CM4.80?
A: Fuel consumption depends on load and RPM. At an efficient cruising RPM (typically around 80% of max, e.g., ~2800 RPM), the engine will likely consume between 2.5 – 4.0 liters per hour (0.66 – 1.06 US gallons per hour), making it very economical for long passages.
Q3: How does the freshwater cooling system benefit the engine?
A: The heat exchanger (freshwater cooling) system circulates a coolant mixture (antifreeze/water) through the engine block. This coolant is cooled by seawater in a separate circuit within the heat exchanger. This prevents salt, minerals, and marine growth from contacting the hot metal of the engine, drastically reducing corrosion and scaling inside the cooling passages and extending the engine’s core life. Learn more: Freshwater vs. Raw Water Cooling Systems.
Q4: What is the expected service life of this engine?
A: With proper installation, regular maintenance (annual impeller changes, oil/filter changes, coolant checks), and conscientious operation, a well-maintained marine diesel like the CM4.80 can reliably provide 8,000+ hours of service. Many engines far exceed this with excellent care.
Q5: Are parts and service support readily available?
A: Craftsman Marine has a growing international dealer and distributor network. It is advisable to confirm the availability of a local authorized service center or parts distributor in your region before purchase to ensure support. Parts for the base industrial engine block are often widely available.
🛠️ Recommended Products for Your Project
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Marine Transmission: Twin Disc MG-5064 Marine Transmission
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Diesel Fuel Polisher: Racor 900MAX Dual Filter Assembly
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Engine Control Panel: VDO Marine Engine Control Station
Pros and Cons
| Pros | Cons |
|---|---|
| Proven Reliability: Based on a modern, industrial-grade diesel block known for durability. | Less Established Brand: May not have the long-term brand recognition or dealer density of competitors like Yanmar or Volvo Penta. |
| Freshwater Cooling Standard: Protects the engine from corrosion, enhancing longevity. | Resale Value: May not hold its value as well as a top-tier brand in the secondary market. |
| Excellent Fuel Economy: Direct injection provides exceptional efficiency at cruising RPM. | Parts & Support Network: While growing, the global support network may be less extensive than for market leaders. |
| Competitive Pricing: Often represents a strong value proposition compared to equivalent horsepower engines from premium brands. | |
| Compact & Lightweight: Designed for easy installation in tight engine compartments. |
Conclusion & Ideal Use Case
The Craftsman CM4.80 is a robust and cost-effective marine diesel engine that delivers solid performance for a variety of applications. It is an ideal solution for boat owners and builders who prioritize practical reliability and value.
This engine is perfectly suited for:
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Auxiliary Power for Sailboats: 30 to 45-foot sailboats requiring dependable power for propulsion and charging.
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Primary Power for Small Craft: Fishing boats, workboats, patrol vessels, and passenger launches up to ~35 feet.
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Repower Projects: A strong value-oriented choice for replacing older, less efficient gasoline or diesel engines.
Choose the Craftsman CM4.80 for a straightforward, economical, and dependable power solution that emphasizes core functionality and ease of use. It is a smart choice for practical mariners.
🔗 Official Technical Resources
For detailed installation manuals, technical drawings, and full specification sheets, please refer to the official Craftsman Marine technical documentation portal for the most accurate and up-to-date information.
