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Old 05-23-2018, 07:57 PM   #61
Brian1e's Avatar
City: Freeport, TX.
Vessel Name: Rum Away
Vessel Model: '89 Bayliner 3888
Join Date: Mar 2017
Posts: 14
I would stick with Chem cleaning. The rifle brush would have to ba a .17 cal, not common. 3/16" is 0.182", very slightly larger than .17 cal, and significantly smaller than .22 cal.

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Old 01-23-2019, 01:36 PM   #62
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City: Vancouver Rowing Club, Coal Harbour, Vancouver, B.C.
Vessel Name: Summer Wind 1
Vessel Model: Marine Trader 41
Join Date: Nov 2012
Posts: 242
Thought I would put this out there. Have any of you used Drano to clean a heat exhanger? I have an old onan genset, which I give little respect to, and used drano to clean the heat exchanger. Several years later, no leaks, works fine. I am now about to clean the heat exhanger on my Ford Lehman. I am using a CLR bath at present. How does Drano sound? Have anyone used Drano on there heat exhangers?

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Old 01-23-2019, 02:46 PM   #63
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City: Litchfield, Ct
Join Date: Aug 2012
Posts: 5,865
Drano is an alkaline material which will get the dead critters out of your heat exchanger tubes but it will do nothing for the bulk of the material which is calcium and magnesium deposits. For that you need an acid solution like Rydlyme, CLR, Barnacle Buster or just plain old hydrochloric acid.

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Old 01-23-2019, 03:08 PM   #64
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City: Ashland, MA
Vessel Model: 1990 Silverton 40 aftcabin
Join Date: Jul 2016
Posts: 1,164
GOOD LUCK! There are also salt deposits in there that will not react to either an acid or a base.

My Silverton’s heat exchangers soaked in a radiator shop’s cleaning tank for 3-4 days. The only thing removed was the paint. Finally I resorted to rodding them, took less than 30 minutes to clean, flush using a hose and reassemble.

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