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Old 09-02-2017, 17:31   #16
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Re: Heat Exchanger core extraction

I used "Barnicle Buster" on mine and it came out beautiful! Put the whole assembly in it, I believe it has inhibitors so as not to damage any metal.
Good luck!
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Old 09-02-2017, 18:56   #17
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Re: Heat Exchanger core extraction

If all else fails you might try an aftermarket HE.

Yanmar Heat Exchangers
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Old 10-02-2017, 03:15   #18
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Re: Heat Exchanger core extraction

Try Rydlyme to clean heat exchangers and AC units
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Old 13-02-2017, 06:48   #19
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Re: Heat Exchanger core extraction

I'm with Scout30 - if you can't get it apart or it is too corroded to work reasonably - just get an aftermarket exchanger. I have replaced both of my HE over the years on my 1986 engines with after market ones. If you get one from a quality builder they could very well be better than the OEM. Solder joint crack, rods leak and other internal problems that can't be reliably fixed lead to that conclusion.
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Old 13-02-2017, 07:43   #20
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Re: Heat Exchanger core extraction

Must have been my lucky day.......


I was able to pound the next smaller size open end wrench onto the last stubborn nut on the rear cover, and it came out. Did a preliminary tap with a rubber mallet and saw a slight movement from the core. Soaked in Barnacle Buster for the afternoon. Pretty cool stuff, makes the metal look just like new. Then tapped back and forth with the rubber hammer and got it a little further each time. Till I needed a piece of wood to extend into the housing. I ended up removing it toward the front which was unfortunate. After it came out I realized that the font had an additional ring about an inch from the front. So If I had removed toward the rear I would have cleared that second ring in just a little while. As it was I was pushing through it all the way out.


The condition of the internal parts seems excellent. Don't see any worrysome conditions. Now just waiting for the replacement O rings and end cap gaskets. Hope for everything back together in a week or 2.


Thanks so much for all the advice and help. Made a world of difference.


Dave
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Old 22-02-2017, 06:17   #21
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Re: Heat Exchanger core extraction

OK,

So I'm back. Wondering if it would be wise to do something about the fresh water pump? Hadn't thought that far along till I'm about ready to reinstall the heat exchanger.

Do you guys think it wise to replace or maybe rebuild. Or maybe just take it apart to see?

Also thinking replacing or at least checking the zincs would be a good idea.

Any other items that I should think about checking or replacing now that I have it all apart?

Thanks again for all the information and help.
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Old 22-02-2017, 06:25   #22
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Re: Heat Exchanger core extraction

I am going to flush and replace the coolant, replace the hoses. The water pump">raw water pump has been redone.

Thanks again.
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Old 23-02-2017, 06:58   #23
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Re: Heat Exchanger core extraction

I've never had a problem with the fresh water pump. If it's not showing signs of leaking I'd leave it alone.
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Old 23-02-2017, 07:15   #24
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Re: Heat Exchanger core extraction

Quote:
Originally Posted by Geek_Guy View Post
OK,

So I'm back. Wondering if it would be wise to do something about the fresh water pump? Hadn't thought that far along till I'm about ready to reinstall the heat exchanger.

Do you guys think it wise to replace or maybe rebuild. Or maybe just take it apart to see?

Also thinking replacing or at least checking the zincs would be a good idea.

Any other items that I should think about checking or replacing now that I have it all apart?

Thanks again for all the information and help.
Grab the Fresh wáter pulley and feel if there is any play in the shaft , also see if there is any trace of coolant coming from the seal, no play and no coolant the pump could be ok ....
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Old 04-03-2017, 22:04   #25
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Re: Heat Exchanger core extraction

Parts for your engine...
http://www.marinedieseldirect.com/ca...ors=&comment1=

Not cheap but available.
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