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Old 02-25-2015, 01:05 PM   #1
Reel Spearit
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Heat exchanger question

Has anybody replaced the end caps, gasket and o rings on a volva penta heat exchanger? It looks very straight forward any advice or tips would be helpful.
Thanks, Jason
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Old 02-26-2015, 09:01 AM   #2
stevemc1
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Re: Heat exchanger question

I have not on a VP but most are pretty straight forward. Take it apart and see how the Oring is set and clean it out, and put it back together. I take the tube bundle out and fill a 5 gallon bucket with water and muratic acid. About 1/2 a gallon acid to 3 gallons of water. I put in the tube bundle and all tubes should bubble, if not take a bronze brazing rod and poke and clean it out. Let it bubble for 10 minutes and take it out and put in other end. Rinse well with a hose shooting it in all holes, making sure they are clear. Make sure you always have a good zinc too.
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Old 02-26-2015, 02:47 PM   #3
Reel Spearit
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Re: Heat exchanger question

Thanks for the information. Would you use a sealing compound on the end caps and gaskets?
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Old 02-26-2015, 04:29 PM   #4
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Re: Heat exchanger question

I use silicone sealant. Both sides of the gasket. Bolt up evenly and tight right after you put on sealant. O ring doesnt need any. I used to be a marine diesel mechanic, still doing it on others boats, and my own.
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Old 03-04-2015, 01:42 AM   #5
1000ft2TheBeach
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Re: Heat exchanger question

I prefer not to use muriatic acid, it is very caustic to your skin and the semi precious metals in all of your raw water system components. For this I use Barnacle buster which you usually mix 1-4 bb-water. Why this is better in my opinion is, if you get distracted and have an already older unit that you are submerging in muriatic acid you can quite rapidly get holes in the hose ends, we had used muriatic for years, however the barnacle buster will mainly only eat away at the scale and rather rapidly as well, but even if you left it for a few hours or overnight you will still have your part left. On silicon: use it sparingly on rough or uneven surfaces, I haven taken apart many engines & components that are caked with the excess silicon clogging many important throughways and oil screens. If you have any wuestions feel free to hit me up. 949 424-4076
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Old 03-17-2015, 06:24 PM   #6
Reel Spearit
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Re: Heat exchanger question

Thanks for all the information! Just completed the job on mine. Replaced the end cap gaskets and O rings with new ones from volva penta. Used a gasket sealing compound on the gasket and O rings. So far no leaks.....
Jason
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