I have an old 1985 2p engine and i can't get the engine cover off. I don't have the manual but it looks like the screw on the top of the engine cover is the one to take off. I can't get the screw undone. it is pretty rusted. I pput luberication on it over night and still can't seem to get it off. So my question is how to get the screw off and is the screw on the top of the engine cover the right screw to be taken off?