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Yanmar53 HP
Yanmar 4JH45E 53.8HP
diesel
$4,050.00
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New
Yanmar
Yanmar 3YM30AE 29.1 HP
$3,100.00
Yanmar 3YM30AE – 29.1 HP marine diesel engine, 3-cylinder, 1.27 L displacement, 4-stroke, water-cooled, suitable for sailboats and pleasure craft.
Horsepower
29 HP
Fuel Type
diesel
Displacement
1.266 L / 77 cu. in
Rated Output
21.3 kW / 29.1 mhp
Rated Speed
3200 rpm
In Stock (3 available)
Free shipping on orders over $500
90-day warranty included
Description
The Yanmar 3YM30AE is a compact, dependable 3-cylinder marine diesel engine designed for sailboats and small vessels. It features a 4-stroke, vertical water-cooled diesel configuration with natural aspiration and indirect injection, offering smooth, economical operation and robust performance. Known for its reliability and compliance with modern emission standards, it comes with flexible mounting and standard marine accessories.
Specifications
SKUY096421
BrandYanmar
CategoryInboard Engines
ConditionNew
Horsepower29 HP
Fuel Typediesel
Displacement1.266 L / 77 cu. in
No. of Cylinders3 cylinders
Rated Output21.3 kW / 29.1 mhp
Rated Speed3200 rpm
Cylinder Bore x Stroke80 mm x 84 mm / 3.15 in x 3.31 in
Combustion SystemIndirect Injection, In-line Pump
AspirationNatural
Alternator12V - 125A
Dry Weight127 kg / 280 lbs
Dimensions715 mm x 485 mm x 545 mm
ControlsMechanical
CertificationsRCD 2 EPA Tier 3 EPA Tier 3C BSO II EMC
Frequently Asked Questions
What is the Yanmar 3YM30AE engine?
The Yanmar 3YM30AE is a 3-cylinder, 4-stroke, vertical water-cooled marine diesel engine with a rated output of 29.1 metric horsepower (21.3 kW) at 3200 rpm, designed primarily for pleasure craft and small motorboats.
What are the core specifications of this engine?
Rated Power: 29.1 mhp (21.3 kW) at 3200 rpm Displacement: 1.266 L (77 cu in) Cylinders: 3 Combustion: Indirect injection, in-line pump. Aspiration: Natural Alternator: 12 V – 125 A Dry Weight (without gear): ~127 kg (280 lbs) Controls: Mechanical
What type of cooling system does it use?
The 3YM30AE uses a freshwater cooling system with a heat exchanger, which helps prevent corrosion from raw seawater and keeps the engine operating at the correct temperature.
What components come with the standard engine package?
Exhaust mixing elbow (L-type) Alternator 12 V – 125 A B20 control panel Flexible engine mounts Expansion tank for the freshwater cooling system Electric stop solenoid Belt safety cover.
What optional accessories are available?
High-riser exhaust mixing elbow Extension or dual wiring harnesses TFX sidemount control head Hot water kit Saildrive leg extension Spare parts kit .
What kind of boats is the 3YM30AE ideal for?
This engine is commonly used as auxiliary power or primary propulsion on small sailboats, cruisers, and recreational motorboats where compact size, reliability, and diesel fuel economy are important.
How often should routine maintenance be performed?
Oil and filter changes: Typically every ~100 hours or annually (whichever comes first). Raw water pump impeller: Inspect/replace every 1–2 years. Fuel filters & separators: Drain and check frequently; replace per manual intervals. Cooling system: Clean heat exchanger regularly to prevent salt buildup.
Can I do maintenance myself?
Basic checks (oil level, coolant level, belts) can be done by knowledgeable owners. However, Yanmar recommends that more complex tasks and diagnostics be performed by authorized dealers to ensure correct procedures and protect warranty.
What makes Yanmar engines like the 3YM30AE reliable?
Yanmar’s marine diesels are known for robust construction, simple mechanical design, and efficient combustion, which help provide quiet operation, strong low-end torque, and long life when properly maintained.
What fuel should I use?
Use marine diesel fuel that meets local specifications. Diesel offers good energy density, fuel economy, and safety on board compared to gasoline. Proper fuel filtration and water separators are important because marine diesel systems are sensitive to water contamination.
