How to clean a Yanmar marine heat exchanger

This is the first of a two part video, where I replace a leaking marine fresh water pump, decalcify the salt water heat exchanger, and inspect the exhaust elbow. The engine is Yanmar 3GM30FC - YEU engine on a J109 sailboat with a sail drive.

Part 2 is here:    • How to replace a marine diesel fresh ...  

The demonstration shown here is amateur effort, posted in good faith for free, but with no guarantees as to safety or accuracy. There is significant risk to engine repair, both from the perspective of causing damage to the engine and to personal safety. Any misadventure you encounter if you decide to embark on DIY repair is on you. Never forget to read widely and search out multiple sources to verify any information you find. Almost every engine repair will lead to at least one complication, and you need to ask yourself if your skill set and tools are adequate to deal with complications as they arise.

Yanmar are exemplary in their willingness to publish OEM repair manuals, so be sure to search out and read the manual appropriate for your engine. The “YEU” engine shown here has a serial number beginning with the letter E, signifying that it was partly assembled in Europe. Most of the parts are the same but it is worth checking to be sure yours is the same.

The first music clip is “Fast Talking” by Kevin MacLeod,
licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/

The second music clip is “River Mediation” by Audionautix,
licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Artist: http://audionautix.com/