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Craftsman CM4.80 – Marine Diesel Engine 80 HP
Craftsman CM4.80 – 80 HP is a high-performance marine diesel engine featuring a turbocharged 4-cylinder architecture for superior power-to-weight performance on larger displacement vessels. The turbocharger optimizes air intake for more efficient combustion, delivering the higher cruising speeds needed for larger yachts while maintaining the legendary reliability of a freshwater-cooled industrial base.
- Engine Power Specification: 80 HP at 2500 RPM.
- Core Engine Mechanical Design: 4-Cylinder Turbocharged Diesel 2500cc.
- High Precision Fuel Induction: Turbo-optimized mechanical injection.
- Optimal Marine Vessel Compatibility: Perfect for large cruising sailboats and light commercial craft.
- Long Term Warranty Coverage: 6-year Craftsman Marine limited warranty.
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Description
Craftsman CM4.80 80 HP – Reliable Mitsubishi-Based Diesel
Overcoming the reliability challenges of offshore cruising, the Craftsman Marine CM4.80 delivers 80 HP at 2500 RPM. Built on a heavy-duty Mitsubishi industrial block, this 4-cylinder engine is a favorite for American sailboat owners and motor-sailers who require a “bulletproof” auxiliary power source. The CM4.80 provides massive low-end torque for motoring through heavy head-seas, offering USA boaters a mechanically simple and robust power plant that is easy to maintain in remote coastal locations from the Atlantic seaboard to the Gulf of Mexico.
Meeting applicable EPA emission standards, the CM4.80 focuses on thermal efficiency and low vibration levels to enhance the environment on deck. The engine features a high-grade freshwater cooling system and a saltwater-resistant heat exchanger, specifically engineered to withstand the corrosive conditions of the American maritime environment. Its high-output alternator and compatibility with various gearbox options ensure that American yacht owners can customize their propulsion system for maximum reliability during long-distance American coastal voyages.
Core Technical Specifications
- Maximum Output: 80 HP at 2500 RPM.
- Displacement: 203 cubic inches (3.33 Liters).
- Configuration: 4-cylinder in-line, 4-stroke diesel.
- Aspiration: Natural aspiration for peak simplicity.
- Dry Weight: Approximately 635 lbs (engine only).
- Fuel System: Direct mechanical injection.
- Electrical: 12V / 90A marine alternator.
- Compliance: EPA Tier certified (Model Specific).
Craftsman CM4.80 Full Specs
| Engine type | 4-Cylinder In-line (Mitsubishi Base) |
| Displacement | 3.33L (3331 cc) |
| Bore x stroke | 94 x 120 mm |
| Horsepower | 80 hp (58.8 kW) |
| Rated rpm | 2500 rpm |
| Aspiration | Naturally Aspirated |
| Compression ratio | 22.0:1 |
| Fuel system | Indirect Injection |
| Recommended fuel | Diesel (EN 590) |
| Ignition/Firing Order | Compression / 1-3-4-2 |
| Alternator | 12V, 90 Amp |
| Gear ratio/Drive | Technodrive / ZF (Various Ratios) |
| Transmission | Mechanical / Hydraulic Gearbox |
| Dry weight | 275 kg (606 lbs) |
| Flywheel housing | SAE 4 / 7.5" |
| Steering | Mechanical / Hydraulic compatible |
| Coolant capacity | 11L |
| Exhaust system | Water-injected wet exhaust (50 mm) |
| Cooling system | Indirect cooling (Heat exchanger) |
| Lubrication | Forced lubrication |
| Oil capacity | 10L |
| Emissions rating | EU RCD II, BSO II |
Craftsman CM4.80 Service & Performance Guide
What is the fuel consumption of the Craftsman CM4.80?
The CM4.80 consumes approximately 4.8 gallons per hour at its maximum 3,000 RPM. This 3.1-liter four-cylinder engine is based on a rugged Mitsubishi block, offering smooth and reliable propulsion for sailing yachts. Cruising at 2,200 RPM significantly improves the fuel-to-range ratio while maintaining steady torque for driving through currents.
What oil grade is required for the Craftsman CM4.80?
This engine requires 8.5 quarts of SAE 15W-40 oil meeting API Service Class CD or higher. The mechanical fuel injection system is highly reliable, but clean oil is essential for the longevity of the overhead valve train and crankshaft. Replace the oil and the spin-on lube filter every 200 hours to ensure internal engine cleanliness.
How does the Craftsman CM4.80 cooling system operate?
The CM4.80 utilizes a freshwater cooling loop with a high-capacity heat exchanger and integrated expansion tank. This setup protects the cast-iron block from internal corrosion while providing heat for the vessel’s domestic water heater. Regularly check the sacrificial zinc anodes and the seawater pump impeller to prevent thermal stress.
What are the electrical system specifications for this engine?
A standard CM4.80 includes a 12V-90A alternator to manage the power needs of modern electronics and battery charging. This system is designed for high reliability in offshore marine environments. Ensure all electrical grounds are secured to the engine block to prevent electrolysis and ensure steady voltage to the helm panel.
What are the physical dimensions and weight of the CM4.80?
The dry weight is 591 lbs, measuring 36.8 inches long and 24.2 inches high. Its robust and simple mechanical design makes it a favorite for repowering mid-sized sailboats. Allow for 4 inches of side clearance for easy access to the fuel-water separator and the oil dipstick during routine checks.
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