okay... I removed the Oil pump and popped it off.. there is a big hole in the engine case the shape of and exhaust port (w/2 screw holes) where the cam from the pump goes in.. I didn't see any way to seal it off and I couldn't find anything on the pump that I could use to accomplish this task... can I take the pump apart to remove the guts and cam and replace the top part of the pump to its original place to close the hole?? What am I missing donp??