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How to acid clean sea water intercoolers
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amelliahona <no_reply@...>
Bill Rouse:
I was browsing the photos section today and noted your excellent tutorial on servicing the sea water intercooler for the Onan Genset on the Super Maramu. You mentioned that you cleaned the inner workings of the intercooler with "acid cleaning". Could you elaborate on your process for us. Thanks, Gary Silver s/v Liahona |
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Judy and Bill aboard SV BeBe <yahoogroups@...>
Gary,
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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. Bill BeBe SM2k, #387 --- In amelyachtowners@..., amelliahona <no_reply@...> wrote:
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amelliahona <no_reply@...>
Bill:
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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. Gary --- In amelyachtowners@..., "Judy and Bill aboard SV BeBe" <yahoogroups@...> wrote:
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Judy and Bill aboard SV BeBe <yahoogroups@...>
Gary, I will completely answer when I can get to my laptop. It was the freshwater exchanger. There are some gaskets and O rings you must have before attempting. I will come back with details and part numbers.
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Bill Bill --- In amelyachtowners@..., amelliahona <no_reply@...> wrote:
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Judy and Bill aboard SV BeBe <yahoogroups@...>
Gary,
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Before removing and cleaning the heat exchanger on the Yanmar 100hp, order these parts: Gasket - Heat Exchanger 129693-44420 2 each O Ring - Heat Exchanger 24321-001000 2 each You may not need to replace the O rings, but the gaskets are very delicate and will tear when the exchanger is disassembled. I drained the coolant before starting and reused the same coolant. I also used this opportunity to change the thermostat, gasket and the 3 fan belts. Parts: Thermostat 129470-49801 1 each Gasket, Therm 129795-49551 1 each V-Belt 25132-004600 3 each Disassembly/assembly is straight forward. It has been several years ago and I do not recall any issues or problems. Hope this helps. Bill BeBe, SM2k, #387 --- In amelyachtowners@..., "Judy and Bill aboard SV BeBe" <yahoogroups@...> wrote:
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