3YM20 21HP

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SKU: 3YM20

YANMAR sailing and smaller craft engines deliver the high-end performance and unequaled reliability associated with over 100 years of innovation. Bringing common rail technology to smaller recreational and light duty commercial applications, YANMAR exclusively provides the benefits of fuel efficiency, added power, and cleaner operation to sailing and smaller crafts. With the largest global support network in the marine engine industry and delivering 5x Best in Class features associated with common rail technology, YANMAR engines have become the global standard in sailboat and small craft propulsion.

Rated output15.3 kW / 21 mhp
Rated Speed3600 rpm
Displacement0.854 L [52.1 cu in]
Cylinders3 in-line
Bore x Stroke70 mm x 74 mm
Type4-stroke, vertical, water-cooled diesel engine
Emission complianceEU: RCD 2, BSO II, EMC. US: EPA Tier 3.
Warranty2 + 3 year extended warranty

For the latest manuals, product guides, spec sheets and more, please visit Yanmar Marine's product page.


  • Corrosion Protection
  • Reliable
  • Simple & Efficient
  • Whisper Quiet & Low Vibration
  • Easy Maintenance
  • User Friendly
  • Extra Protection

Engine type [mhp]9 - 29
Reduction Ratio (fwd/asn)2.64/2.64
Reduction gear systemConstant mesh gear with dog clutch
Dry weight [kg - lbs]30 kg [66 lbs]

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