Yanmar 3GM30F Marine Diesel Engine

The Yanmar 3GM30F Marine Diesel Engine is a powerful, compact, and highly reliable inboard marine diesel engine designed for auxiliary propulsion in sailboats and small to medium cruising vessels. As part of Yanmar’s proven GM-series, the 3GM30F is well known for its durability, fuel efficiency, and smooth performance in demanding marine environments.

Engine Design & Construction

The 3GM30F features a 3-cylinder, 4-stroke diesel configuration with direct fuel injection, delivering excellent low-end torque and stable power output across the operating range. Its robust engine block and precision-engineered components are built to withstand continuous operation in saltwater environments, ensuring long service life and dependable performance.

A freshwater cooling system with heat exchanger helps maintain optimal operating temperatures while protecting internal components from corrosion. The compact engine layout allows easy installation in limited engine compartments while still providing good access for routine inspection and maintenance.

Performance & Efficiency

Producing approximately 27 horsepower, the Yanmar 3GM30F delivers smooth and consistent propulsion for cruising, maneuvering, and docking. The engine’s torque characteristics at low and mid-range RPM make it ideal for sailboats and displacement hulls that require reliable thrust and precise control.

The efficient combustion system and mechanical simplicity contribute to low fuel consumption, making the 3GM30F an economical choice for extended cruising and daily marine use.

Marine Integration

Designed specifically for marine applications, the 3GM30F is compatible with marine gearboxes and conventional shaft-drive systems. Its balanced three-cylinder design reduces vibration and noise compared to two-cylinder engines, enhancing onboard comfort during long operating hours.

Ease of Maintenance & Reliability

The Yanmar 3GM30F is valued for its simple, service-friendly design. Routine maintenance tasks such as oil changes, filter replacement, and belt inspection are straightforward, minimizing downtime and maintenance costs. Thanks to the widespread use of the GM-series, spare parts and service support remain widely available worldwide.

Ideal Applications

The Yanmar 3GM30F Marine Diesel Engine is ideal for:

• Sailboats and auxiliary propulsion systems

• Small to medium cruising yachts

• Coastal and offshore recreational vessels

• Owners seeking a reliable, fuel-efficient marine diesel engine

Key Advantages

• Proven Yanmar marine diesel reliability

• Compact and space-efficient design

• Fuel-efficient 3-cylinder direct injection engine

• Freshwater cooling with heat exchanger

• Smooth operation with reduced vibration

• Easy maintenance and strong global parts support

Technical Specifications

General

• Model: Yanmar 3GM30F

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

• Fuel System: Direct fuel injection

• Aspiration: Naturally aspirated

• Number of Cylinders: 3 inline

Displacement & Combustion

• Displacement: Approx. 1.116 liters

• Bore × Stroke: 78 mm × 78 mm

• Combustion Chamber: Direct injection diesel

Performance

• Rated Power: Approx. 27 HP (20 kW) @ 3,200 RPM

• Rated Speed: 3,200 RPM

• Maximum Torque: Approx. 65–70 Nm @ 2,000–2,500 RPM

• 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. 5 liters

• Recommended Oil Type: Marine-grade diesel engine oil

Electrical System

• Starting System: 12 V electric start

• Starter Motor Output: Approx. 1.2–1.4 kW

• Alternator: 12 V marine alternator for onboard electrical systems

Dimensions & Weight

• Overall Dimensions (L × W × H): Approx. 700 × 500 × 600 mm

• Dry Weight: Approx. 160–170 kg (engine only, excluding gearbox)

Drive & Installation

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

• Drive Type: Inboard shaft drive

• Compatible Gearbox: Standard marine gearbox for small to medium inboard engines

• Mounting: Flexible engine mounts to reduce vibration

Service & Adjustment

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

• Firing Order: 1 – 2 – 3

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