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Guest Bob

Yanmar Heat Exchange maintenance

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Hello, have a clogged yammer 3ym30 heat exchanger. Want to understand ways to treat and how to remove.

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I'm relying on memory since it's been a while since I've torn apart a Yanmar Heat Exchanger.  You will need to unbolt the two end caps.  Start at one end, remove the end cap and look at the tubes, if they are fouled, then continue removing the rest to take out the exchanger.  You can then clean the tubes and the caps to remove any scale or fouling.  But before you touch the heat exchanger, check all strainers and hoses up line to the through hull.  Sometimes a piece of sea grass gets in the hose and is enough to cause overheating.  I had that happen to me and after disassembling the heat exchanger to find that it was clean, I started to go backwards to the through hull.  I took the hose off from the seacock to the strainer and after flushing it with water found that it was full of sea grass.

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