Condition: Used – Low Hours – Running Take-Out (RTO)
Brand: Yanmar
Model: 3YM20
Horsepower: 21 HP @ 3600 RPM
Fuel Type: Diesel
Cooling: Freshwater / Heat Exchanger
Starting: Electric Start – 12V
Application: Sailboat / Inboard Marine Propulsion
Country of Origin: Japan – OEM Yanmar
For sale is a used Yanmar 3YM20 marine diesel engine in LOW HOURS RTO (Running Take-Out) condition. Engine was professionally removed from a running sailboat and was operational at the time of removal.
The 3YM20 is one of Yanmar’s most popular modern auxiliary sailboat engines, known for:
Excellent fuel economy
Smooth 3-cylinder operation
Low vibration and noise
Long service life and easy maintenance
✅ Ideal for repower, replacement, or upgrade from older GM-series engines.
| Specification | Details |
|---|---|
| Engine Model | Yanmar 3YM20 |
| Horsepower | 21 HP @ 3600 RPM |
| Cylinders | 3 |
| Displacement | 1.267 L (1267 cc) |
| Bore x Stroke | 75 mm x 72 mm |
| Aspiration | Naturally Aspirated |
| Fuel System | Mechanical Direct Injection |
| Cooling System | Freshwater / Heat Exchanger |
| Electrical System | 12V |
| Starting | Electric |
| Emissions | EPA / RCD Compliant |
| Approx. Dry Weight | ~ 233–260 lbs (engine only) |
(Transmission not included unless specifically stated.)
Original OEM MSRP (New – engine only): approx. $8,500 – $9,800 USD
Typical Used Market Value (Low-Hour RTO): $4,500 – $7,500 USD, depending on condition and hours
✅ Serious savings versus new replacement.
For sale is a Yanmar 3YM20 marine diesel engine, used LOW HOURS RTO, removed from a running sailboat. Engine is complete, intact, and operational at time of removal.
21 HP 3-cylinder marine diesel
Freshwater-cooled
Electric start – 12V
OEM Yanmar – Made in Japan
Excellent for sailboat auxiliary propulsion or repower projects
✅ Engine sold as shown
❌ Control panel, wiring harness, mounts, shaft & prop not included unless pictured
Buyer is responsible for pickup or freight shipping arrangements. We can assist with secure crating and freight coordination at buyer’s request and cost.
15-DAY DOA GUARANTEE (FROM DATE OF DELIVERY OR PICKUP)
Covers Dead On Arrival only
❌ No warranty after installation
❌ No coverage for misuse, overheating, improper installation, or alignment issues
✅ SOLD AS-IS / WHERE-IS
📍 LOCAL PICKUP – SOUTH FLORIDA (FOB POMPANO BEACH, FL)
Buyer is 100% responsible for all shipping
Crating, freight & insurance are at buyer’s cost
We can assist with logistics coordination upon request
No liability for freight damage once item leaves our facility
This is a USED marine diesel engine. Cosmetic wear is normal. Buyer is responsible for verifying horsepower, rotation, mounts, transmission compatibility, and overall fitment prior to purchase.
Sold as shown in pictures
Colors may vary by monitor
All measurements are approximate
Hardware, gauges & manuals NOT included
May show stains, scratches, dents, or scuffs from use/handling
No returns after installation – No exceptions