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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.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.