Re: How to acid clean sea water intercoolers

amelliahona <no_reply@...>


That is very helpful. Thanks for the On-Off info. I will look into it. When used as a hull cleaner does it etch the gelcoat at all?

Which Yanmar heat heat exchanger did you clean? Was it the fresh water to sea water exchanger, the seawater to engine oil exchanger, or the sea water to transmission fluid exchanger?

I know that the Yanmar sear water to fresh water heat exchanger tubular core is a separate part from the housing in which it sits. Can you elaborate on the removal process/difficulty if indeed you have done that?

Thanks for all your help.


--- In amelyachtowners@..., "Judy and Bill aboard SV BeBe" <yahoogroups@...> wrote:


I was in New Zealand and could not buy acid because it requires a special license...I had a marine engineering shop do it for me.

However, I did acid-wash the heat exchanger core on the Yanmar using On-Off which is a combo of hydrochloric, oxalic and phosphoric acids. I let the heat exchanger core soak in the On-Off for about 5-10 minutes until it was visibly clean. I then rinsed it with fresh water and soaked it in a bucket of baking soda and water to neutralize any residual acid.

A side note about On-Off: On-Off is advertised as a hull cleaner, but is also an excellent metal cleaner and rust remover. DO NOT USE it on chrome plated turnbuckles or chrome plated winches as it will remove the chrome.

Hope this helps.

BeBe SM2k, #387

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