Yanmar 3YM30 Marine Diesel Engine

The Yanmar 3YM30 is a compact, reliable, and fuel-efficient inboard marine diesel engine delivering 29–30 HP, designed for sailboats, small yachts, and auxiliary propulsion applications. As part of Yanmar renowned YM series, the 3YM30 combines durability, smooth performance, and low emissions, making it a trusted choice for boat owners worldwide.

Engine Design & Construction

The 3YM30 features a 3-cylinder, 4-stroke diesel configuration with direct fuel injection, providing consistent power and smooth torque across the operating range. Its robust construction and high-quality components are built to withstand continuous operation in challenging marine conditions.

Equipped with a freshwater cooling system with heat exchanger, the engine maintains optimal operating temperatures while protecting internal components from corrosion. The compact and lightweight design allows installation in tight engine compartments and ensures easy access for maintenance.

Performance & Efficiency

Delivering 30 HP at 3,200 RPM, the Yanmar 3YM30 offers smooth, dependable propulsion for cruising, docking, and maneuvering. Its torque characteristics at low and mid-range RPM make it ideal for displacement hulls and sailboats that require consistent thrust and precise control.

The engine’s direct fuel injection system ensures high fuel efficiency, reducing operational costs while maintaining reliable performance.

Marine Integration

The 3YM30 is compatible with marine gearboxes and conventional shaft-drive systems, providing flexible installation options. Its balanced 3-cylinder design minimizes vibration and noise, improving onboard comfort.

Ease of Maintenance & Reliability

The Yanmar 3YM30 is designed for easy maintenance, with accessible filters, belts, and other service points. Its simplicity and durability reduce downtime and long-term maintenance costs. Yanmar global support network ensures availability of spare parts, guaranteeing long-term reliability.

Ideal Applications

The Yanmar 3YM30 Diesel Engine is ideal for:

Sailboats and auxiliary propulsion systems
Small to medium cruising yachts
Coastal and inland waterways
Owners seeking a compact, reliable, and 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 low vibration and noise
Easy maintenance with strong global parts support

Technical Specifications

General

Model: Yanmar 3YM30
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. 1.64 liters
Bore × Stroke: 75 mm × 78 mm
Combustion Chamber: Direct injection diesel

Performance

Rated Power: 29–30 HP (22–22.5 kW) @ 3,200 RPM
Rated Speed: 3,200 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. 6 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. 870 × 520 × 600 mm
Dry Weight: Approx. 210–230 kg (engine only, excluding gearbox)

Drive & Installation

Rotation (Crankshaft): Counter-clockwise (viewed from flywheel end)
Drive Type: Inboard shaft drive
Compatible Gearbox: Marine gearbox compatible with small inboard engines
Mounting: Flexible engine mounts

Service & Adjustment

Valve Clearance (Cold): Intake: 0.20 mm / Exhaust: 0.25 mm
Firing Order: 1 – 2 – 3
Maintenance Access: Easy access to filters, belts, and service points

Yanmar 3YM30

Yanmar 3YM30 Diesel Engine Sale