Diesel in Antifreeze?? - Ford Powerstroke Diesel Forum
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Old 01-30-2009, 09:01 AM
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Diesel in Antifreeze??

Helping my step father out here, he has taken his truck to two mechanics, one said oil cooler and one said turbo. So I said BS on both of them and decided to do some research(never worked on a PSD, but have 6 yrs experience automotive work) I believe this would be an injector cup problem where diesel fuel is getting into the antifreeze(nothing at all is in the oil it is clean because I drained it and checked)

Here is a pic of the froth that was on top of the antifreeze after sitting for a week.

On the right is a pic of antifreeze(new) and the used oil from the engine.

Just want to make sure the left is diesel fuel and not burned oil that has turned to froth?

If you want more pics let me know. I know how to pressurize the cooling system and If I look at it I can take the injectors out. Hopefully it is one of the front 4 cylinders(i have heard)

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Old 01-30-2009, 09:14 AM
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I would look at the head gaskets. Maybe do a leak down test.
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Old 01-30-2009, 09:28 AM
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are you positive it's fuel and not oil? that looks like oil mixed with antifreeze to me. and also that oil looks way too milky.
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Old 01-30-2009, 09:30 AM
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That oil looks like it has antifreeze in it.

IE:


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Old 01-30-2009, 09:40 AM
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oil cooler is bad , , or front engine cover has a hole in it behind water pump , but if its getting oil in coolant , i would say more oil cooler

Last edited by SCUFFY828; 01-30-2009 at 09:43 AM.
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Old 01-30-2009, 09:41 AM
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yes it does.
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Old 01-30-2009, 09:47 AM
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The bottle on the right I did for comparison reasons I mixed the used oil with new antifreeze. Here is a better picture of the bottle on the left with it settled so you can see the layers. The bottle from the left came out of the radiator itself when I did the flush.
The oil is absolutely clean with not even a drop of antifreeze, just disregard the bottle on the right, I was just trying to see if I could mimick the left bottle by mixing oil and antifreeze together.

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Old 01-30-2009, 09:55 AM
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I had diesel fuel in my antifreeze reservior. It was over flowing when it got hot enough. You could see a change in mpgs. and smell fuel everywhere. Ended being a cracked injector cup. I replaced all of mine. Removed the heads and have them cleaned up at the machine shop while we were in there. ended up costing around $2000.
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Old 01-30-2009, 10:08 AM
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It was overflowing from the resivoir when I did the flush, but I still dont know if its oil or fuel. Can I try to light it on fire? I know it takes a lot of heat before oil with catch flame, but what about the diesel fuel.
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Old 01-30-2009, 10:11 AM
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Just tried to light the froth and it will not light, so that means it's oil and since no antifreeze is in oil and oil is in antifreeze its a bad oil cooler?
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