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454 Heat exchanger

W

Will Newton

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Would like to clean out the t

Would like to clean out the the raw water heat exchangers on my 1989 Mercrusier 454s. Was told that the best option was to have them boiled to properly clean them out. Operating temp is up a bit but not a huge problem. Will a good cleaning with a wire bush be enough? Also flushing out the closed cooling system as well. Any suggestions/shortcuts for this type of job--first attempt with this boat. (33 Bertram)
 
" Use a non-metallic brush to

" Use a non-metallic brush to clean the tubes. The idea is to remove debris/blockage without disturbing/penetrating the oxidized (Green) surface coating. This coating should remain as it will quickly reform and does not hinder heat transfer, and removing it will shorten the heat xchanger life. "
 
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