Weird substance floating in coolant - Ford Powerstroke Diesel Forum
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Old 10-25-2013, 07:06 PM
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Weird substance floating in coolant

I have worked on many 7.3's and have never seen this before. This is a friends truck and when he brought it to me to replace the GPR with a White Rogwes unit I noticed a layer of something floating in his coolant degas tank. It was about 3/16 inche thick layer. I have seen oil and fuel, but I do not think it is either. I put a sample from the truck in a bottle (left). To show him it wasn't oil I filled another bottle with new coolant and added oil (right). I shook them both up and after everything settled this is what i got in the picture. It does not smell like fuel, and I am baffled. He did tell me he put bars leak in the truck a while back because he was losing coolant. My question is, What could this be? Could it be the stop leak contaminating the coolant? Thank you for your time. -Jacob
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Old 10-26-2013, 12:53 AM
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I would say it might be that stop leak stuff mixed with oil. Maybe from a leaking oil cooler. The problem with that stuff is I bet if you pull his oil cooler it'll be all full of crap now. That stuff is designed to plug holes which is exactly what your oil cooler is. On a 6.0 it's certain death because the oil cooler has much smaller holes but I've seen a 7.3's (mine) be all clogged up with stop leak crap.
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