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I don't understand the mechanics of the oil pump. '51 dodge B3..218 engine. I have to fix a leak at the oil pump cover plate. So when I took the cover plate off, the outer rotor fell out. I see there is a slot grooved in the outside of the outer rotor, like a woodruff key might fit in there, but can't see inside the pump where it would engage with another slot. Does the outer rotor spin as the inner is spun with the camshaft? Or is the outer supposed to be fixed with the woodruff key and the inner spins inside it? I am so new to this thing. I don't understand the mechanics of it.