Yanmar 3YM30AE Marine Diesel Engine

The Yanmar 3YM30AE is a compact, reliable, and fuel-efficient inboard marine diesel engine delivering 30 HP, specifically engineered to meet modern marine performance and emission standards. As an enhanced version within Yanmar’s renowned YM series, the 3YM30AE combines proven durability with improved efficiency, making it an excellent choice for sailboats and small cruising yachts.

Engine Design & Construction

The 3YM30AE features a 3-cylinder, 4-stroke diesel configuration with direct fuel injection, ensuring smooth power delivery and strong torque throughout the RPM range. Its robust engine block and marine-grade components are designed for continuous operation in demanding marine environments.

A freshwater cooling system with heat exchanger maintains stable operating temperatures while protecting internal engine parts from corrosion. The engine’s compact footprint allows easy installation in limited engine spaces, while well-positioned service points simplify routine maintenance.

Performance & Efficiency

Producing 30 HP at 3,200 RPM, the Yanmar 3YM30AE delivers dependable propulsion for cruising, docking, and maneuvering. Its excellent low- and mid-range torque characteristics make it ideal for displacement hulls and auxiliary sailboat propulsion.

The advanced fuel injection system ensures efficient fuel consumption and reduced exhaust emissions, helping lower operating costs while supporting environmentally responsible boating.

Marine Integration

The 3YM30AE is compatible with marine gearboxes and conventional shaft-drive systems, offering flexible installation options for a wide range of boat designs. Its balanced 3-cylinder layout minimizes vibration and noise, enhancing onboard comfort during extended operation.

Ease of Maintenance & Reliability

Designed with serviceability in mind, the 3YM30AE provides easy access to filters, belts, and key maintenance points. Its durable construction and simple mechanical layout help reduce downtime and long-term maintenance costs. Backed by Yanmar’s global service network, owners benefit from excellent parts availability and technical support.

Ideal Applications

The Yanmar 3YM30AE Marine 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 lightweight design

• Fuel-efficient 3-cylinder direct injection engine

• Freshwater cooling with heat exchanger

• Smooth operation with low vibration and noise

• Easy maintenance with worldwide service support

Technical Specifications

General

• Model: Yanmar 3YM30AE

• 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: 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

• Torque Characteristics: Strong low- and mid-range torque for auxiliary propulsion

• Fuel Consumption: Fuel-efficient, dependent on load and propeller matching

Cooling & Lubrication

• Cooling System: Freshwater cooling with heat exchanger

• Lubrication System: Forced lubrication with trochoid 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 Output: 12 V / approx. 125 A

• Control System: Electric panel compatible

Dimensions & Weight

• Overall Dimensions (L × W × H): Approx. 870 × 520 × 600 mm

• Dry Weight: Approx. 220–230 kg (engine only, excluding gearbox)

Drive & Installation

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

• Drive Type: Inboard shaft drive

• Compatible Gearbox: Yanmar marine gearbox (KM series)

• Mounting: Flexible marine 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, impeller, and service points