Still using antifreeze - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 12 Old 09-04-2010, 06:40 AM Thread Starter
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Still using antifreeze

Well just looking for some insight just got done doing headgaskets studs and egr delete still putting antifreeze in the oil Everything looked good checked the front cover on the motor again looked fine. Does anybody have any ideas what it might be? About one gallon in 200 miles!
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post #2 of 12 Old 09-04-2010, 07:16 AM
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Oil cooler is another place oil and coolant can intermingle, but typically not coolant into the oil, it's usually oil into the coolant since the oil system pressure is higher than the cooling system pressure.

What I'd do, is drain the oil out of it. Fill the cooling system. Pressurize the hell out of the cooling system, I'm talkin 20psi. Leave the drain plug out of the oil pan. See how long it takes for it to start coming out, as well, see if it's mixed with oil when it does start to come out.

Did you have the heads checked when you had them off?

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post #3 of 12 Old 09-04-2010, 08:23 AM Thread Starter
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No I didn't just visually looked at them. Figured since it was so much coolant if it was a crack it would be pretty noticable. Checked cylinder walls for signs of pitting too nothing. Just seems odd. Has anybody seen cracked heads on these motors yet? Thanks for the input.
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post #4 of 12 Old 09-04-2010, 09:41 AM Thread Starter
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This whole mess started with a blown egr cooler ever since then nothin but antifreeze leaks.
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post #5 of 12 Old 09-04-2010, 11:28 AM
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Not necessarily, on the crack.

If you're getting coolant in the pan, it has to be getting in somewhere. I would be taking a very close look at cylinder head castings, cylinder walls. You've deleted the coolers entirely?

You're 100% sure the front cover isn't cavitated, at all?

Try what I suggested with the pressure testing with no oil in it. You might even hook some regulated shop air to the degas bottle, keep it low, 20psi, 25 tops and see if that leads you anywhere.

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post #6 of 12 Old 09-04-2010, 11:39 AM
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When my truck ran away last year, the head cracked......but there is not telling how hot it got during that 30-45 seconds of hell.

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post #7 of 12 Old 09-04-2010, 12:01 PM
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^^^ What he said.

I betcha it right next to warm.

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post #8 of 12 Old 09-04-2010, 03:35 PM Thread Starter
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The wierd thing is they pressure tested after they replaced egr cooler no leaks no nothing then. I'm gonna dig into it here tomorrow or Monday see what I can find.
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post #9 of 12 Old 09-04-2010, 06:50 PM
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Sometimes it takes a heat cycle or two for leaks to show up after reassembly.

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post #10 of 12 Old 09-07-2010, 08:33 AM Thread Starter
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Pulled the thermastats last night there looks to be some wierd casting flaws below the t-stat that is closest to the bottom it might be erosion I'm thinking it is after talking to a tech that has seen this before.
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