Can a H/X be repaired? - SailNet Community
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post #1 of 20 Old 10-03-2019 Thread Starter
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Can a H/X be repaired?

I pulled the 3¼" heat exchanger from my Universal M25 yesterday so that I could clean the passages, and some of the verdigris that was building up near the end caps. There was a fair amount of crud in there, but I was able to remove it from all but one tube. For that one tube I used the "brute-force" method of forcing whatever was plugging it out. The result is that the heat exchanger now is leaking between the coolant and raw water sides... In retrospect, I suspect that this one tube was never designed to allow raw water to flow...

I have a new H/X on order already, but I am curious; can this be repaired?


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post #2 of 20 Old 10-03-2019
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Re: Can a H/X be repaired?

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Originally Posted by eherlihy View Post
I pulled the 3¼" heat exchanger from my Universal M25 yesterday so that I could clean the passages, and some of the verdigris that was building up near the end caps. There was a fair amount of crud in there, but I was able to remove it from all but one tube. For that one tube I used the "brute-force" method of forcing whatever was plugging it out. The result is that the heat exchanger now is leaking between the coolant and raw water sides... In retrospect, I suspect that this one tube was never designed to allow raw water to flow...



I have a new H/X on order already, but I am curious; can this be repaired?
E, It should be repairable you can also do what many people have done, take it to a radiator repair shop.
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Re: Can a H/X be repaired?

Thanks D!

However most "Radiator/Boiler Shops" (near me, anyway) simply sell the parts that they have on the shelf.


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Re: Can a H/X be repaired?

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Thanks D!



However most "Radiator/Boiler Shops" (near me, anyway) simply sell the parts that they have on the shelf.
Just like electric motor shops I'm sure they're disappearing quick.

On the other hand it probably doesn't have to be original equipment, those type heat exchangers can be rather generic larger it's not a bad thing in this case because the engine thermostat regulates the block temperature,. It doesn't even have to be mounted on the engine although it was
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Re: Can a H/X be repaired?

Any boat yard with a machine shop or radiator shop should be able to help you out for a lot less than the cost of replacing one. I doubt radiator shops would carry parts for HXs , but they do have the copper tube and soldering expertise to fix almost any HX, given the housing is sound.
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Re: Can a H/X be repaired?

To repair this H/X all that would be necessary is to braze a glob of rod over each end of this perticular tube, thus sealing it off. Unfortunately, it seems that I can't find a radiator shop in southern New England...

A brand-spankin' new heat exchanger is on its way to me - for $350. I just need to paint it with the $35 Universal Diesel bronze paint before I install it.
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Re: Can a H/X be repaired?

Try to solder it
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Re: Can a H/X be repaired?

Epoxy? MarineTex?


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Re: Can a H/X be repaired?

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Any boat yard with a machine shop or radiator shop should be able to help you out for a lot less than the cost of replacing one. I doubt radiator shops would carry parts for HXs , but they do have the copper tube and soldering expertise to fix almost any HX, given the housing is sound.
You forgot to include " I have to devalue anything Denise says"

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Re: Can a H/X be repaired?

Quote:
Originally Posted by eherlihy View Post
To repair this H/X all that would be necessary is to braze a glob of rod over each end of this perticular tube, thus sealing it off. Unfortunately, it seems that I can't find a radiator shop in southern New England...



A brand-spankin' new heat exchanger is on its way to me - for $350. I just need to paint it with the $35 Universal Diesel bronze paint before I install it.
If you stop at a HVAC you should be able to pick up a couple sticks for copper brazing I think the trade name is " silvaloy". You can also use silver solder and flux which is the kinda the same thing in the sticks
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