Yanmar 2GM20F Marine Diesel Engine

The Yanmar 2GM20F Marine Diesel Engine is a compact, dependable, and fuel-efficient 2-cylinder inboard marine diesel engine designed for auxiliary propulsion in sailboats and small vessels. Known worldwide for its reliability and simplicity, the 2GM20F has become a trusted choice for boat owners seeking consistent performance with low operating and maintenance costs.

Engine Design & Construction

The 2GM20F features a 2-cylinder, vertical, 4-stroke diesel configuration with direct fuel injection, ensuring efficient combustion and dependable torque delivery. Its robust construction and high-quality materials are engineered to withstand harsh marine environments, providing long service life even under continuous use.

A freshwater cooling system with heat exchanger helps maintain stable operating temperatures and protects internal components from corrosion caused by saltwater exposure. The engine’s compact layout allows easy installation in confined engine compartments while still offering good access for routine maintenance.

Performance & Efficiency

Producing approximately 18 horsepower, the Yanmar 2GM20F delivers smooth and steady propulsion ideal for cruising, docking, and auxiliary sailing operations. The engine is optimized for low fuel consumption, making it an economical solution for long-distance cruising and everyday marine use.

Its torque characteristics at low and mid-range RPM provide excellent control and responsiveness, particularly valuable for sailboats and displacement hull vessels.

Marine Integration

Designed specifically for marine applications, the 2GM20F is compatible with marine gearboxes and shaft drive systems, allowing flexible installation options. Its balanced design contributes to reduced vibration and quieter operation, enhancing onboard comfort during extended voyages.

Ease of Maintenance & Reliability

One of the key strengths of the Yanmar 2GM20F is its simple and service-friendly design. Routine service points such as filters, belts, and pumps are easily accessible, reducing downtime and simplifying maintenance tasks. The engine’s widespread use ensures strong spare parts availability and long-term support.

Ideal Applications

The Yanmar 2GM20F is well suited for:

Sailboats and auxiliary propulsion systems
Small yachts and cruising vessels
Coastal and inland waterway boats
Owners seeking a proven, 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 parts availability

Technical Specifications

General

Model: Yanmar 2GM20F
Engine Type: 4-stroke, vertical, water-cooled marine diesel
Fuel System: Direct fuel injection
Aspiration: Naturally aspirated
Number of Cylinders: 2 inline
Displacement: 1,061 cc (1.06 L)
Bore × Stroke: 80 mm × 84 mm

Performance

Rated Power: 18 HP (13.2 kW) @ 3,000 RPM
Rated Speed: 3,000 RPM
Torque: Approx. 52 Nm @ 2,000–2,500 RPM
Fuel Consumption: Efficient low-load marine consumption (varies with load/propeller)

Cooling & Lubrication

Cooling System: Freshwater cooling with heat exchanger
Lubrication System: Forced lubrication with gear-type oil pump
Engine Oil Capacity: Approx. 5.5 liters
Lubrication Oil Pressure: Normal operating pressure ~3.0–4.0 kgf/cm²

Electrical System

Starting System: 12 V electric start
Starter Output: 1.1–1.4 kW
Alternator/Generator: 12 V charging system

Dimensions & Weight

Overall Dimensions (L × W × H): Approx. 693 × 489 × 582 mm
Dry Weight: Approx. 150–160 kg (engine only; excludes gearbox and mounting hardware)

Drive & Installation

Rotation (Crankshaft): Counter-clockwise (viewed from flywheel end)
Mounting Flange: SAE standard marine mounting
Compatible Gearbox: Marine gearbox compatible with small inboard engines
Propeller Shaft Rotation: Clockwise (viewed from stern)

Service & Adjustment

Valve Clearance (Cold): Intake ~0.20 mm / Exhaust ~0.20 mm
Fuel Injection Timing: Set for optimal combustion timing
Firing Order: 1-2
Recommended Maintenance Intervals: Per Yanmar marine service schedule (oil, filters, belts, cooling system)

Yanmar 2GM20F

Yanmar 2GM20F Marine Diesel Engine Sale