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Old 09-04-2016, 15:57   #1
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orange crud around the heat exchanger

seeing a lot of orange crud around heat exchanger, is this viscous stuff indication of anything?
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Old 09-04-2016, 16:13   #2
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Re: orange crud around the heat exchanger

What color is your coolant?
One type is orange, there's a yellow and a green.
If is salt water side of the exchanger it will leak put as a grey or white ooze.

Where on the heat exchanger is it coming from?

Btw, don't panic they can be repaired or u can buy a reconditioned one if need be... but it could be a leaky hose or gasket.



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Old 09-04-2016, 18:10   #3
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Re: orange crud around the heat exchanger

attached is a photo of it. The coolant is the Dex-Cool stuff. I found the orange crud in the compartment for the heat exchanger. Hot water removes it, could it be coolant leak? That would make sense...
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Old 10-05-2016, 11:31   #4
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Re: orange crud around the heat exchanger

just got through testing with our local yanmar guy, we have a leak between the fresh and sea water coolant coming from the seals (or possible the heat exchanger core). This was confirmed by having the exhaust water hoses disconnected from the heat exchanger and then pressurizing the coolant. Smoking gun. It was probably difficult to see because when you have this type of leak, the sea water side pressurizes first, causing the coolant not to drop down visibly. Obviously there was not external leak into the engine bilge.
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Old 10-05-2016, 11:35   #5
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Re: orange crud around the heat exchanger

You can fix the. So don't let the Yanmar guy try to sell u a new one cos they are over $2,000!

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Old 10-05-2016, 11:38   #6
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Re: orange crud around the heat exchanger

When you get it back together, flush the Bejesus out of it to get rid of that Dexcool. I've never had problems with it, but many have, it does not mix with other coolants.
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