Yanmar 3GMC Marine Diesel Engine

The Yanmar 3GMC is a compact, efficient, and highly reliable marine diesel engine designed for auxiliary and propulsion use on small to mid-sized sailboats and motorboats. Known for Yanmar legendary durability and fuel efficiency, the 3GMC has become a trusted choice among boat owners worldwide.

Engine Design & Construction

The Yanmar 3GMC features a 3-cylinder, 4-stroke diesel configuration with a robust cast-iron engine block engineered for long service life in marine environments. Its compact footprint allows for easy installation in tight engine compartments, making it ideal for both new builds and repowering projects.

Performance & Power Delivery

Producing smooth and consistent power, the 3GMC delivers excellent low-end torque, ensuring reliable maneuvering, steady cruising, and confident docking performance. The engine is optimized for quiet operation with reduced vibration, enhancing onboard comfort.

Fuel Efficiency & Operation

Equipped with a direct fuel injection system, the Yanmar 3GMC offers outstanding fuel efficiency and clean combustion. Its economical fuel consumption makes it suitable for long-distance cruising while keeping operating costs low.

Cooling & Marine Reliability

The engine utilizes a freshwater cooling system with heat exchanger, protecting internal components from corrosion while maintaining optimal operating temperatures. This design enhances durability and ensures dependable operation in both saltwater and freshwater conditions.

Maintenance & Serviceability

The Yanmar 3GMC is designed for ease of maintenance, with accessible service points for routine inspections and servicing. Backed by Yanmar extensive global service network, spare parts and technical support are widely available.

Applications

The Yanmar 3GMC Marine Diesel Engine is ideal for:

• Sailing yachts

• Small motorboats

• Cruising boats

• Auxiliary propulsion systems

Key Advantages

• Proven Yanmar marine diesel reliability

• Compact and lightweight design

• Fuel-efficient direct injection system

• Freshwater cooling with heat exchanger

• Quiet operation with low vibration

Technical Specifications

General

• Model: Yanmar 3GMC

• Engine Type: 4-stroke marine diesel engine

• Aspiration: Naturally aspirated

• Fuel System: Direct injection

• Number of Cylinders: 3 inline

Displacement & Combustion

• Displacement: Approx. 0.91 liters

• Bore × Stroke: 76 mm × 82 mm

• Compression Ratio: Approx. 21.3 : 1

• Combustion System: Direct injection diesel

Performance

• Rated Power Output: Approx. 20 HP (14.7 kW) @ 3,600 RPM

• Maximum Torque: Approx. 54 Nm @ 2,400 RPM

• Rated Engine Speed: 3,600 RPM

• Duty Rating: Marine auxiliary / light propulsion

Cooling & Lubrication

• Cooling System: Freshwater cooling with heat exchanger

• Lubrication System: Forced lubrication system

• Engine Oil Capacity: Approx. 2.6 liters

Electrical System

• Starting System: Electric start

• Electrical Output: 12 V

• Alternator: 35 A marine alternator

Dimensions & Weight

• Dry Weight: Approx. 110–115 kg

• Overall Dimensions (L × W × H): Approx. 650 × 470 × 550 mm

Air & Exhaust

• Air Intake: Naturally aspirated

• Exhaust System: Marine wet exhaust compatible

Fuel Consumption

• Fuel Consumption: Approx. 2.0–2.2 liters/hour at cruising speed

Installation & Drive

• Rotation: Standard marine rotation

• Drive Type: Inboard marine propulsion

• Transmission Compatibility: Mechanical marine gearbox

• Mounting: Flexible marine engine mounts