Quote:
Originally Posted by HDRDTD
I have heard of (in rare cases), where the material (in this case aluminum) is actually is porous to a small degree due to a flaw in the casting process, allowing liquid to seep thru the material itself.
I believe in one case it was an engine block. They couldn't find where it was leaking until they did a dye test, which showed it was leaking directly through the wall of the engine block. Weird huh??
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You are correct. It was leaking through the rear of the engine block near the rear main cover on some LS engines. GMs repair was to clean it off really good and seal it with silicone hah.
Service Information tells you to apply engine sealant (silicone) to the front cover gasket tabs. I apply it to the rear cover tabs as well just as a bit of precaution. I haven't had an oil pan come back for a leak yet, been 11 years doing it. Just make sure you don't go crazy, it only needs a .2 diameter bead run .8 inches long across the tabs.