Yanmar 2GM Marine Diesel Engine

The Yanmar 2GM Marine Diesel Engine is a compact, durable, and fuel-efficient inboard marine diesel engine designed primarily for auxiliary propulsion in sailboats and small marine vessels. Renowned for its mechanical simplicity and long-term reliability, the 2GM series has earned a strong reputation among boat owners and marine professionals worldwide.

Engine Design & Construction

The Yanmar 2GM features a 2-cylinder, 4-stroke diesel configuration with direct fuel injection, delivering consistent torque and dependable performance at low and mid-range RPM. Its solid engine block and high-quality internal components are engineered to withstand continuous operation in harsh marine environments, ensuring a long service life.

The engine is typically equipped with a freshwater cooling system using a heat exchanger, which helps maintain stable operating temperatures and protects internal components from corrosion caused by saltwater exposure. Its compact footprint allows for installation in tight engine compartments while maintaining access for routine servicing.

Performance & Efficiency

Designed for efficiency and reliability rather than high-speed output, the Yanmar 2GM provides smooth and steady propulsion ideal for cruising, docking, and auxiliary sailing operations. The engine delivers strong low-end torque, making it well-suited for displacement hulls and sailboats that require dependable thrust at modest RPM.

Optimized combustion and mechanical efficiency result in low fuel consumption, making the 2GM an economical choice for long-distance cruising and daily marine use.

Marine Integration

Built specifically for marine applications, the Yanmar 2GM is compatible with marine gearboxes and conventional shaft drive systems. Its balanced design contributes to reduced vibration and acceptable noise levels, improving onboard comfort during extended operation.

Ease of Maintenance & Reliability

One of the standout advantages of the Yanmar 2GM is its simple, service-friendly design. Routine maintenance tasks such as oil changes, filter replacement, and belt inspection are straightforward, helping minimize downtime and maintenance costs. Thanks to the widespread use of the 2GM series, spare parts availability remains strong in many regions.

Ideal Applications

The Yanmar 2GM Marine Diesel Engine is well suited for:

• Sailboats and auxiliary propulsion systems

• Small cruising yachts

• Coastal and inland waterway vessels

• 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 for cruising and maneuvering

• Easy maintenance with long-term parts support

Technical Specifications

General

• Model: Yanmar 2GM

• 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. 0.64 – 0.70 liters

• Bore × Stroke: Approx. 70 mm × 72 mm

• Combustion Chamber: Direct injection diesel

Performance

• Rated Power: Approx. 13–16 HP (depending on variant and rating)

• Rated Speed: Approx. 3,000 RPM

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

• Fuel Consumption: Low fuel consumption, dependent on load and propeller matching

Cooling & Lubrication

• Cooling System: Freshwater cooling with heat exchanger

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

• Engine Oil Capacity: Approx. 4.0 liters

• Recommended Oil Type: Marine-grade diesel engine oil

Electrical System

• Starting System: 12 V electric start

• Alternator: 12 V marine alternator

• Charging Output: Suitable for basic onboard electrical systems

Dimensions & Weight

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

• Dry Weight: Approx. 120–135 kg (engine only, without 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