Yanmar
3YM20
GM/YM Series
Yanmar Australia

Engine Specifications

Application

Sailing Engine

Power Output (HP)

21

Power Output (kW)

15.3

Rated Speed

3600 RPM

Displacement

0.854 L

Cylinders

3

Bore x Stroke

70mm x 74mm

Aspiration

Natural

Dry Weight

110kg

Dimensions

694 mm x 463 mm x 600 mm

Controls

Mechanical

Certifications

RCD 2, EPA Tier 3, EPA Tier 3C, BSO II, EMC

YM Series

The YM series of mechanical engines are built for smaller sailboats and pleasure craft. Delivering reliable power and smooth performance for unforgettable on-water experiences.

Clean

Produces minimal emissions due to advanced technology

Interconnective

Smooth integration to any multi-function bridge display

Quiet

Engineered for minimal noise and low vibration

Powerful

Powerful low-end torque and acceleration

Fuel Efficient

Optimized fuel consumption for longer journeys

NEW 3‑Year Extended Warranty

Boat with confidence. Every new YANMAR marine engine includes a robust limited warranty – and now you can extend protection even further with our NEW 3 Year Extended Warranty for eligible engines, delivering up to 5 years of total coverage for private leisure use when conditions are met.

Why it matters

  • Peace of mind backed by a global network of trained experts
  • Maintenance performed by a YANMAR Authorized Dealer using YANMAR Fluids and Genuine Parts
  • Coverage tailored to your usage: Leisure, Charter, and Light Duty Commercial (LDC)
  • Simple online registration via the YANMAR Marine Support Portal

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.

Features

  • 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.

Details

  • 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.

Common Rail Technology

As a leading diesel engine manufacturer, YANMAR integrates the most advanced common rail technology into our innovative marine engines.

Common rail technology is a digitally controlled, high-pressure fuel injection and sensor system that optimizes engine efficiency & performance.

Compatible Products

* All information shown is to be used as general information only. Images shown are for illustration purposes only and may not represent the final product. All dimensions, power outputs and technical details are approximate and may vary from time to time depending on a range of factors. Any data shown is subject to change without notice. Some items or accessories may not be available in all areas/regions. Please consult your Authorised Dealer or Power Equipment Account Manager for all technical information.

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