1988 omc, 3.0 . I tried to open the drain **** on my exhaust manifold and nothing. The little metal thing turned but no joy on the actual drain opening or closing. I also tried to just remove the whole fitting. I put a wrench on it but it didn't budge. I didn't put too much force on it, so it isn't mangled or anything. How to loosen the drain. Does the fitting come right out? Could I heat it and put some vicegrips on it? Andy tips and experience much appreciated.
