introduction Welcome to the world of Yanmar Marine! Yanmar Marine offers engines, drive systems and accessories for all types of boats, from runabouts to sailboats, and from cruisers to mega yachts. In marine leisure boating, the worldwide reputation of Yanmar Marine is second to none. We design our engines to respect nature. This means quieter engines, with minimal vibrations, cleaner than ever. All of our engines meet applicable regulations, including emissions, at the time of manufacture. Constant efforts are made to improve the quality and performance of Yanmar products, so some details included in this manual may differ slightly from your engine.
If there are any discrepancies, please contact an authorized Yanmar Marine dealer or distributor. BY2 and BY Engines: The control systems for the BY2 and BY engines are almost identical. BY2 information can be used for earlier BY engines. When an item is different, it is identified and explained in the text. 6LY3 and 6CX Engines: The control systems for the 6LY3 and 6CX engines are very similar. The information supplied can be used for either engine. When an item is different, it is identified and explained in the text. Note: The 6CX engine covered in this book is the electronic version identified as 6CX530. This manual is intended for the use of trained service personel.
The specifications and components described in this manual may differ from those installed on the vessel. Please refer to the manual provided by the manufacturer of these components. Part numbers may be found in Sections 4, 17, or the Yanmar order sheets. Software revision information can be found in Appendix A. © 2011 Yanmar Marine International • Rev. 2.0 Yanmar Electronic Control Systems Technical Manual xvii