Home Engines YM Series

YM Series



14 mhp
10 kW
3600 rpm


21 mhp
15.3 kW
3600 rpm


29.1 mhp
21.3 kW
3200 rpm


  • An ideal solution for smaller recreational boats, the YM series diesel engines are four-stroke, swirl pre-combustion chamber units equipped with liquid coolant systems.
  • All naturally aspirated, the full range of 2-cylinder and 3-cylinder models feature indirect injection, in-line pump combustion systems.
  • The engines are equipped with a marine gear or sail drive unit.
  • The YM series of mechanical, lower output engines complements the largest common rail recreational and light-duty commercial diesel engine line-up on the market.

Reliable and Easy to Maintain

Delivering key benefits including easy maintenance, low noise, reliability, and durability, the YM series of mechanical engines are specifically designed for smaller sailboats and other pleasure craft.

The 3-model line-up provides a proven solution to meet output needs below 40 mhp, offering exceptionally quiet operation and low emissions, with EPA regulation Tier 3 marine compliance since 2009.

Easily accessible even when installed in small vessels, the YM series features a simplistic design that ensures uncomplicated maintenance.

The engines are also highly durable and built to last for both new builds and repowering.

Oceanis 30.1

Oceanis 30.1


  • The YM series is available in 3 output models, the 2YM15, 3YM20 and 3YM30AE, spanning 14, 21 and 29.1 mhp.

  • The vertical, water-cooled 4-cycle diesel engines are controlled using the YANMAR B20 mechanical panel.

  • Certifications include RCD 2, EPA Tier 3, EPA Tier 3C, BSO II and EMC.

  • With flexible mounting, the standard engine package includes an L-type exhaust mixing elbow, B20 panel, expansion tank for fresh water cooling system, electric stop solenoid and belt safety cover.

  • Further optional accessories are available.

  • All YM series engines are compatible with Kanzaki Shaft Drive Gears, SD25 Sail Drive, B20 & C30 Mechanical Panels

YANMAR MARINE INTERNATIONAL is pleased to offer three additional years of Limited Warranty on the YM Series engine models. This additional warranty is offered to first-time owners of YM engine models on the condition that the engine is used for private and recreational purposes only.


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