3YM30AE
The Yanmar 3YM30AE is a 1.266-litre naturally aspirated three-cylinder marine diesel rated 29.1 mhp (21.3 kW) at 3200 rpm, the current top model of Yanmar's YM series. It replaced the 3YM30 from 2014 as a sailboat and small-craft auxiliary, sold with a KM2P-1 gear for shaft drive or with an SD25 saildrive.
The 3YM30AE succeeded the original 3YM30 from model year 2014. Although the name and output are almost unchanged, it is a different engine: bore and stroke grew to 80 x 84 mm (1.266 L) and the rated speed dropped from 3600 to 3200 rpm, giving the same power at lower revs. It keeps the YM-series layout of swirl pre-combustion chamber, in-line injection pump and freshwater cooling with a heat exchanger.
Yanmar sells it with the KM2P-1 mechanical cone-clutch reverse gear for a conventional shaft or with a saildrive (SD20 in the early manual, SD25 in current literature). It is certified to EPA Tier 3, RCD 2 and BSO II and is still in Yanmar's range.
Specifications
Power
- Power
- 29 hp
- Power (kW)
- 21 kW
- Rated speed
- 3200 rpm
Engine
- Configuration
- inline 3
- Cylinders
- 3
- Displacement
- 1.266 L
- Aspiration
- naturally aspirated
- Weight
- 133 kg
- Fuel
- Diesel
- Mounting
- Inboard
Reviews
No independent reviews on file yet.
Sources
- 1. 3YM30AE product page (Wayback capture May 2026) — Yanmar Marine International
- 2. 3YM30AE datasheet DS_3YM30AE_A4_082022 — Yanmar Marine International
- 3. YM Series Operation Manual 0AYMM-M0002E (2025.02): 2YM15, 3YM20, 3YM30AE — Yanmar
- 4. YM Series Operation Manual 0AYMM-EN0023: 2YM15, 3YM20, 3YM30AE, 3YM30E, 3YM30 — Yanmar
- 5. YM Series product page (yanmar.com/marine, Wayback capture May 2026) — Yanmar Marine International
Specifications compiled from manufacturer sources.