Identify an oil leak?

I've got an oil leak from the engine. There's a belt driven component that's covered in oil, but I can't identify it. I did put a dye in the oil, so I know it's coming from the engine. If I could identify the component, it might help me identify where the leak is coming from. It's not a head gasket leak. Looking at the engine from the pax side, it's under the overhead cam drive belt cover on the left side or rear most cam. I think it's the 2, 4, and 6 cylinder head.