Antifreeze turns black

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Bear
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Posts: 43
Joined: Thu Oct 01, 2015 9:21 pm

Antifreeze turns black

Post by Bear »

Hi I have a f32 with 1986 crusaders 350 the antifreeze turns black these engines were salt water cooled for a few years then converted back to fresh water cool , I flushed both engines with radiator cleaner put fresh antifreeze in, was clean for awhile then turned black again assuming its rust has anyone had this problem
Jim Bear Shut up & reel II ( life is short go fish)
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prowlersfish
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Joined: Sat Nov 05, 2005 6:56 pm
Location: Lower Chesapeake Bay ,Va

Re: Antifreeze turns black

Post by prowlersfish »

Most likely deposits from being salt water cooled . Pull the pipe plugs/ block drains on both sides of the engine ( black stuff settles there ) flush it out . fill with distilled water & coolant and a good ant-rust . may have to do it more then once . Good luck

This is assuming no other over heating issues . would not hurt to have coolant sent off and tested

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