Yanmar 2GMF Marine Diesel Engine

The Yanmar 2GMF Marine Diesel Engine is a compact, reliable, and fuel-efficient inboard marine diesel engine designed primarily for auxiliary propulsion in sailboats and small vessels. Part of Yanmar renowned 2GM series, the 2GMF is recognized worldwide for its durability, low maintenance requirements, and smooth operational performance.

Engine Design & Construction

The 2GMF features a 2-cylinder, 4-stroke diesel configuration with direct fuel injection, providing consistent torque and dependable power across the operating range. Its robust engine block and precision-engineered components are built to withstand continuous operation in harsh marine environments, ensuring long service life.

Equipped with a freshwater cooling system with heat exchanger, the engine maintains optimal operating temperatures while protecting internal components from corrosion, making it ideal for saltwater and coastal applications. The compact layout allows for easy installation in tight engine compartments while still providing access for routine maintenance.

Performance & Efficiency

Delivering approximately 16–18 horsepower, the Yanmar 2GMF provides smooth and steady propulsion suitable for cruising, docking, and auxiliary sailboat operations. Its strong low- and mid-range torque characteristics ensure reliable thrust for displacement hulls and sailing vessels.

The engine is engineered for fuel efficiency, making it an economical choice for extended cruising and daily marine use.

Marine Integration

The 2GMF is compatible with marine gearboxes and conventional shaft drive systems, allowing flexible installation in a variety of hull designs. Its balanced two-cylinder configuration minimizes vibration and noise, enhancing onboard comfort.

Ease of Maintenance & Reliability

The Yanmar 2GMF is valued for its simple, service-friendly design. Routine maintenance tasks, including oil changes, filter replacement, and belt inspection, are straightforward, reducing downtime and service costs. Yanmar global support ensures wide availability of spare parts, guaranteeing long-term reliability.

Ideal Applications

The Yanmar 2GMF Marine Diesel Engine is ideal for:

• Sailboats and auxiliary propulsion systems

• Small cruising yachts

• Coastal and inland waterway vessels

• Owners seeking a reliable, low-maintenance marine diesel engine

Key Advantages

• Proven Yanmar marine diesel reliability

• Compact and space-efficient design

• Fuel-efficient 2-cylinder direct injection engine

• Freshwater cooling with heat exchanger

• Smooth operation with low vibration

• Easy maintenance and strong global parts support

Technical Specifications

General

• Model: Yanmar 2GMF

• Engine Type: 4-stroke, vertical, water-cooled marine diesel

• Fuel System: Direct fuel injection

• Aspiration: Naturally aspirated

• Number of Cylinders: 2 inline

Displacement & Combustion

• Displacement: Approx. 0.65 liters

• Bore × Stroke: 70 mm × 72 mm

• Combustion Chamber: Direct injection diesel

Performance

• Rated Power: 16–18 HP (12–13 kW) @ 3,000 RPM

• Rated Speed: 3,000 RPM

• Maximum Torque: Optimized for low- to mid-range RPM marine operation

• Fuel Consumption: Low, dependent on load and propeller match

Cooling & Lubrication

• Cooling System: Freshwater cooling with heat exchanger

• Lubrication System: Forced lubrication with gear-type oil pump

• Engine Oil Capacity: Approx. 4 liters

• Recommended Oil Type: Marine-grade diesel engine oil

Electrical System

• Starting System: 12 V electric start

• Alternator: 12 V marine alternator for onboard electrical systems

Dimensions & Weight

• Overall Dimensions (L × W × H): Approx. 620 × 470 × 560 mm

• Dry Weight: Approx. 125–135 kg (engine only, excluding gearbox)

Drive & Installation

• Rotation (Crankshaft): Counter-clockwise (viewed from flywheel end)

• Drive Type: Inboard shaft drive

• Compatible Gearbox: Marine transmission compatible with small inboard engines

• Mounting: Flexible engine mounts

Service & Adjustment

• Valve Clearance (Cold): Intake: 0.20 mm / Exhaust: 0.20 mm

• Firing Order: 1 – 2

• Maintenance Access: Easy access to filters, belts, and service points