Medium and Heavy Trucks
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Hello there! I know you requested Cummins DR but I just saw this post and thought I would assist ;) If you are seeing oil from below the #2 exhaust port I would recommend removing the exhaust manifold and inspecting your valve guide seals. Sounds like you may have a leak there. Once the manifold is removed shine a flashlight into the port, you will see the valve guide, if there is oil present then the guides need to be resealed. Otherwise ensure that it is not a head gasket leak. I hope that helped! If you have additional questions please ask! If you would like to provide your engine serial number I can pull up a diagram to better assist you with the exact oil and coolant flow of your engine. Have a great weekend!
ah ok im sorry! totally read that wrong! are we talking about the vent tube off of the thermostat housing to the cooler? right near the heat shield?
in this area correct? just want to make sure before i continue
Oh ok, im sorry I hadn't meant to confuse anything, no there should not be any oil pertaining to any of the egr cooler lines or the cooler itself. Have you done a pressure test of the egr cooler?
Thank you for the picture, no there should not be any oil there. My question however is that are you sure it is oil? I know that sounds strange but there is a slight chance it could be soot. Usually you would see that on the other side of the cooler, however if the cooler is bad then it is possible thats the problem. When was the cooler last changed? I advise to do a pressure test just to confirm it has not failed. Wont always have symptoms with a cooler failure right off the bat
OR you can remove the exhaust inlet to the cooler and see if it is wet
Yep exactly, soot mixed with coolant looks very much like oil. But there should not be any on that side of the cooler at all, sounds to me like a bad cooler :)
Also if you touch the substance in question, wet soot will have a thin gritty sort of texture, as opposed to oils thicker slimy texture if that helps
well it shouldnt be wet on the front side or the rear
wet soot is a definite sign of a failed cooler
Sounds good, let me know what you find
Ok well that is a good sign then! Can you do the same for the outlet? If it is dry on the outlet side as well I highly recommend doing a pressure test of the cooler itself. Or you can try removing the tube and verifying that the leak is coming from inside the tube. If you do not find black inside of the tube itself then perhaps it is coming from above the line after all. sometimes it is hard to tell.
The tube where the oil leak in question is present
The oil that you are seeing, is it directly around the fitting to the block or are there any signs of it elsewhere?
Ok so then for sure it is originating from the cooler itself? It really sounds as tho the cooler should be removed, inspected and tested
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