forddieseldoctor Posted June 7, 2022 Share Posted June 7, 2022 I have an 05 F250 with a very badly failed egr cooler. The guy decided that he wanted to replace head gaskets and install studs right away. Started pulling it apart today. I noticed that the turbo drain tube had a milky looking film on the top of it. I removed the oil filter and found the engine oil is a milky gray color. The cooling system had about 2 gallons of coffee brown nasty smelling coolant but no oil in it. I popped the coolant pump out and inspected the front cover. I found a small amount of cavitation but nothing earth shattering. I have never seen coolant in the oil from a failed egr cooler before. Anyone else seen this from an egr cooler? Or have any other ideas on what to check so this thing doesn’t burn my butt? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted June 7, 2022 Share Posted June 7, 2022 Can't say I have seen milky oil from a failed EGR cooler but if coolant leaks down the y-pipe when shut off it can enter any cylinder on the right bank and slowly leak past the rings. I doubt it would be enough to cause the oil to do that. We have discussed in the past where bad EGR cooler failures were suspected to cause injector failures. Oil cooler failures on the other hand... Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted June 7, 2022 Author Share Posted June 7, 2022 Got time to finish tearing down today. Found this: The fact that it’s rusty tells me it’s probably not coolant in the oil. We did the last oil change 1 month before the cooler popped and he put about 1500 miles on it since then. Quote Link to comment Share on other sites More sharing options...
cbriggs Posted June 11, 2022 Share Posted June 11, 2022 That's nasty. The brown smelly coolant is due to a plugged oil cooler, which is likely why the EGR cooler failed. I have seen milky oil due to a bad egr cooler failure twice before. The rust is suspect for sure, but being mixed in the crankcase, with heat and such may cause the water to evaporate out of the mix, and it would condense under the valve covers. 1 Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted June 11, 2022 Share Posted June 11, 2022 I have seen a few 6.0L engines with rust on the oil rails but much lighter than this. I thought the cause was a failed cooler but never looked at the vehicle repair history. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted June 12, 2022 Author Share Posted June 12, 2022 Finished it up. Customer admitted to short tripping it a few miles to work and back. I have never seen a diesel do that. Normally it’s on the 5.4 3 valves. Quote Link to comment Share on other sites More sharing options...
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