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'92 IDI oil cooler fixed, oil in coolant now?
Hello to all,
Decided to fix the leaking oil cooler on my "new to me" '92 F250 7.3 IDI 158,000 mi. Replaced all the o-rings/ gaskets and it is no longer leaking oil...Yea! However after doing this, I ran it for a while with the oil filler cap off and noticed a fairly steady stream of "steam" coming from the crank case, and also from where the dipstick tube goes into the block. After running another day or so I'm finding a gray sludge under the radiator cap. Is it likely that the coolant/oil circuits in the oil cooler are leaking internally ? I did not see any signs of corrosion on the inside or outside of the cooler body.
I can't remember if I ran it with the oil filler cap off before fixing the oil cooler, but I don't recall seeing "steam" from the crankcase. I know I did have the radiator cap off before fixing the oil cooler and did not see any "sludge". I don't see any evidence of coolant on the dipstick.
I suspect the previous owner had put in some sort of "leak stop" in the cooling system.
Could be just the gaskets leaking where the cooler headers mount to the block...or an unrelated leak elsewhere ? Any ideas on how to test for the source of the leak ?