Rocinante33
Contributing Partner
Recently our heat exchanger has been showing some problem signs. Significant corrosion showing around the end caps, a very slight leak, and the last two times out, progressively more steam emanating from the exhaust, were all observed. The temp remained OK, though. So I crawled in and extracted the exchanger from the boat. I saw (Torresen Marine Diesel Direct) on line that a new exchanger for my M25 is ~$550, so I did all this with trepidation, to say the least.
I found that the corrosion is superficial.....great news. BUT, a severe case of arteriosclerosis from built up salt was found when I pulled the end caps off. I would estimate less than 10% flow through those tubes! That accounts for the leak- backed up pressure, I surmise.
This was reportedly a new heat exchanger when I bought the boat 4 years ago, so I am a bit surprised at how fast it got to be this bad.
Next steps; to a radiator shop for clean-out & a pressure test, new paint job, then re-install.
If you sail in salt water be aware that this problem can pop up quickly & with little warning!:tongue:
Keith
E-33
I found that the corrosion is superficial.....great news. BUT, a severe case of arteriosclerosis from built up salt was found when I pulled the end caps off. I would estimate less than 10% flow through those tubes! That accounts for the leak- backed up pressure, I surmise.
This was reportedly a new heat exchanger when I bought the boat 4 years ago, so I am a bit surprised at how fast it got to be this bad.
Next steps; to a radiator shop for clean-out & a pressure test, new paint job, then re-install.
If you sail in salt water be aware that this problem can pop up quickly & with little warning!:tongue:
Keith
E-33