Join the C34 Association Today!
[C34 Home] [C34Tech Notes] [C34 Tech Wiki] [Join!]
Please login or register.
Advanced search  


Pages: [1]   Go Down

Author Topic: Corrosion on Hx at anode - ideas?  (Read 99 times)

0 Members and 1 Guest are viewing this topic.


  • Forum - Master Chief Petty Officer of the Navy
  • ********
  • Karma: 32
  • Posts: 3567
  • "Positive Impact" 1984 C-30 #3573 trbsfk M-25
    • View Profile
Corrosion on Hx at anode - ideas?
« on: July 23, 2020, 01:38:41 AM »

A cross-post from a C-30 owner w/ a problem.  I hope if someone has experienced this and determined the cause at this specific location they will chime in.


We purchased this 3 inch heat exchanger about four years ago and itís worked wonders on our engine heating issues. We periodically check and replace zincs in the heat exchanger. But thereís a growing amount of corrosion around the nipple for the zinc threads. Iím wondering if others have seen this happen, and believing I need to change that soon or else Iím gonna have a leak?

Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain


  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 5
  • Posts: 347
    • View Profile
Re: Corrosion on Hx at anode - ideas?
« Reply #1 on: July 23, 2020, 07:44:28 AM »

Mine does the same thing and also around the end caps, but doesn't leak. I'm on my third heat exchanger and they've all done the same thing. I've tried a number of fixes including new gaskets, clamps, hoses, gasket sealer with no luck. My thinking is since I have no leaks that possibly during the heating/cooling cycle atmospheric moisture condenses on these places allowing the corrosion. That's a guess of course, I have no facts to back that up, but since it doesn't leak I don't spend a lot of time worrying about it. From time to time I pull it off, clean, repaint it, and replace it and call it good.
Kevin Quistberg                                                 Top Gun 1987 Mk 1 Hull #273

Ron Hill

  • Forum - Master Chief Petty Officer of the Navy
  • ********
  • Karma: 55
  • Posts: 7012
    • View Profile
Re: Corrosion on Hx at anode - ideas?
« Reply #2 on: July 23, 2020, 02:09:12 PM »

Ken : There is a leak there somewhere - as the salt water is corroding it!!  To stop the corrosion I'd clean it up and put some grease in that area. Grease will not plug the leak, but it will stop the corrosion.

A thought
Ron, Apache #788
Pages: [1]   Go Up