New Yanmar 3YM20XSD25 Engine

New Yanmar 3YM20XSD25 Engine

The Yanmar 3YM20 is a 3-cylinder, 21 mhp (15.3 kW) @ 3600 rpm, naturally aspirated marine diesel engine with a 0.854 L displacement. It features direct or indirect injection (depending on market), freshwater cooling, and is designed for quiet operation. The 3YM20SD25 package pairs this engine with the SD25 saildrive for enhanced maneuverability and efficiency.

Key Technical Specifications (3YM20 + SD25 Saildrive):

Engine Type: 3-cylinder, 4-stroke vertical water-cooled diesel engine.
Rated Output: 15.3 kW / 21 mhp (21.7 HP) @ 3600 rpm.
Displacement: 0.854 L.
Bore x Stroke: 70 mm x 74 mm.
Emissions Compliance: EPA Tier 3, RCD 2, BSO II.
Dry Weight (Engine only): 110 kg.
Saildrive Model: SD25 (2.64:1 reduction ratio).
Electrical: 12V – 125A alternator.
Fuel System: In-line pump, indirect injection.
Aspiration: Natural.
Noise Reduction: Specifically designed for low noise and vibration.

The SD25 saildrive features a dog clutch and provides efficient propulsion, often paired with folding propellers for reduced drag.