Replacing Your Yanmar 1GM10? Why the NANNI N2.10 is the Best Small Marine Diesel Repower Option
So the time has come to replace your Yanmar 1GM10 engine. Whether it’s age, reliability, or performance pushing the decision, the NANNI N2.10 is an ideal repower solution for small sailboats or motor vessels, delivering smooth performance, improved efficiency, and long-term reliability.
Top Reasons to Choose the NANNI N2.10 for Your Repower
The NANNI N2.10 is a compact, twin-cylinder marine engine that offers a powerful and reliable upgrade from the Yanmar 1GM10. Key benefits include:
• Built on a proven Kubota diesel base
• Twin-cylinder design delivers smoother, quieter operation
• Freshwater cooling system protects engine components from corrosion
• Low RPM operation increases torque and cruising comfort
• Compatible dimensions and mounting make for a straightforward replacement for the Yanmar 1GM10
Performance Comparison – NANNI N2.10 versus Yanmar 1GM10
| Feature | NANNI N2.10 | Yanmar 1GM10 |
| Cylinders | 2 | 1 |
| Cooling | Freshwater via heat exchanger | Direct seawater |
| Horsepower | 10 HP at 3000 RPM | 9 HP at 3600 RPM |
| Torque | 23.76 Nm (33% more) | 17.82 Nm |
With greater torque and lower RPM, the NANNI provides better thrust for cruising and reduced engine stress.
Will It Fit in Place of the Yanmar 1GM10?
Yes – installing the NANNI N2.10 in place of the Yanmar 1GM10 is usually straightforward. Here’s how the dimensions compare:
| Specification | NANNI N2.10 | Yanmar 1GM10 |
| Length | 558mm | 554mm |
| Height | 395mm | 385mm |
| Weight | 87kg | 81kg |
The engine mount width on the NANNI matches the Yanmar 1GM10, making the physical installation seamless in most cases.
Installation Considerations When Replacing the Yanmar 1GM10
While the NANNI N2.10 is an excellent direct replacement and the process is generally straightforward, here are a few key modifications to consider during installation:
• Propeller Shaft Coupling: Replace the Yanmar’s coupling with a standard 4-inch type. A Polyflex clamp-on coupling paired with a flexible drive coupling works well.
• Raw Water Intake: The NANNI’s freshwater cooling requires a larger intake — ¾ inch vs Yanmar’s ½ inch. This upgrade also allows you to connect a calorifier for onboard hot water.
• Exhaust System: Yanmar uses a 45mm exhaust, while the NANNI uses 40mm. A reducer easily adapts this difference.
• Fuel Lines: Both engines typically use standard 8mm fuel feed and return lines.
• Throttle & Gear Cables: Similar mounting positions mean minimal changes are needed.
• Instrument Panel: The NANNI includes a new dash panel and wiring loom, making it a true plug-and-play install.
Propeller Compatibility for Your Repower
The correct propeller size will depend on your:
• Gearbox ratio
• Existing propeller dimensions
• Vessel size and type
Not sure what prop will suit your repower? Contact us with your specifications, and we’ll recommend the ideal setup for performance and fuel efficiency.
Ready to Repower Your Boat With NANNI?
Get in touch with our engine experts to discuss your repower project. We’ll help you choose the perfect configuration, guide you through installation, and ensure you get the best long-term value from your new engine.