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post #1 of 20 Old 09-04-2018 Thread Starter
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Raw Water Heat Exchanger teardown, Westerbeke

I cut open a heat exchanger. Someone might want to see this if they are trying to troubleshoot one.

https://youtu.be/xRXcXRQD-eg
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post #2 of 20 Old 09-04-2018
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Re: Raw Water Heat Exchanger teardown, Westerbeke

Oh... You "may" have destroyed it for naught.

They come apart and can be re-tubed. Sometimes a tube is solder plugged

It's a very old technology also found in horizontal tube boilers called Marine boilers.

There are the exchangers as big as your engine some are even as big as a boat

Edit: they, meaning others,

the proper term is "shell in tube heat exchanger" the tubes inside are called the bundle and they are usually removable + repairable with solder or brazing the bad tube,

But, the cost is to replace small H/X's I'd probably equal or higher than replacing them with new for the non DIYer.

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Re: Raw Water Heat Exchanger teardown, Westerbeke

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Oh... You destroyed it for naught.
They come apart.
Thanks, but *someone* bought me a new one, and any more time spent on the broken one is money wasted. The scrap metal will be recycled, of course.

In any case, I'm wondering what you mean by come apart, because this one is all welded shut!
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Re: Raw Water Heat Exchanger teardown, Westerbeke

I said many, not all, or yours.

Usually one end one end comes off, the bundle slides out, O-rings or gaskets seal the header ends.
Smaller ones like what is on your engine are brazed together it doesn't mean they can't be repaired it just means it's more difficult. It is pretty much a throw away design.

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Re: Raw Water Heat Exchanger teardown, Westerbeke

Actually the term is "shell AND tube heat exchanger".

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Re: Raw Water Heat Exchanger teardown, Westerbeke

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Originally Posted by JimsCAL View Post
Actually the term is "shell AND tube heat exchanger".
The one on your air conditioner is called coaxial lol
Yeah it's pretty hard to get the shell inside a tube. Lol

Y'all might need some help with this one. Lol


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Re: Raw Water Heat Exchanger teardown, Westerbeke

That is the 2" x 16" bronze H/X Universal part number 303145. It is appropriate for the Universal M-12, M2-12, M-18, M-20 and M2-20. These were also used on the M25, but it is really too small for that application.

I have a 299049, which is the same H/X without the mounting straps. I pulled it off of an M25 when I upgraded it to a 3" H/X. This particular H/X has less than a year of use on it and is in excellent condition. You can have it for $50 (the bronze alone should be worth that) plus the cost of shipping if you want a spare. It's been sitting in my garage for over two years. Send me a PM if interested.
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Last edited by eherlihy; 09-04-2018 at 09:32 AM.
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Re: Raw Water Heat Exchanger teardown, Westerbeke

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That is the 2" x 16" bronze H/X Universal part number 303145. It is appropriate for the Universal M-12, M2-12, M-18, M-20 and M2-20. These were also used on the M25, but it is really too small for that application.

I have a 299049, which is the same H/X without the mounting straps. I pulled it off of an M25 when I upgraded it to a 3" H/X. This particular H/X has less than a year of use on it and is in excellent condition. You can have it for $50 (the bronze alone should be worth that) plus the cost of shipping if you want a spare. It's been sitting in my garage for over two years. Send me a PM if interested.
Thanks the meta-data!

I don't think I will need a spare any time soon, so I'll pass.
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Re: Raw Water Heat Exchanger teardown, Westerbeke

I remember an old-timer describing banking the coals over, straping on a rescue plank over the asbestos suit with a fire hose running and going into the firebox like a pizza on a peel .Find the leaking tube/s and plug before the subs find you behind the convoy .Kinda makes you wonder if you have what it takes. On a brighter note, if the ends of your moderately sized Ht ex are removable ,not a trinket for the recycle bin, determine if it's tubes or ?? Offending tubes can be plugged with a cedar dowel and get you to a repair shop. I carried oxygen/acycet and a selection of bronze and silver solder /flux on board and frequently fixed stuff beyond my pay scale.
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post #10 of 20 Old 09-04-2018
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Re: Raw Water Heat Exchanger teardown, Westerbeke

This makes me appreciate my Beta Marine engine - the heat exchanger tube stack simply slides out for cleaning.
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