OP,
The end of the cam shaft is hollow, and the metal plug Jake refers to is metal like a bottle cap (but no wrinkles around the edge), pressed in with the cup end towards you. It should be totally solid.
As mentioned, there are a fair number of incidents where squeezed out sealant ends up plugging a passage, and your situation comes up.
Do NOT just remove that cam cover as the cover serves as the bearing cap (and bearing) for the cams. Spring pressure from the variocam tensioner will pop the cams out of place. You need the tool which mounts to the head and holds the cams through those holes where the plastic plugs are before you remove the fasteners which hold the cam cover on.
I have an extra tool I made if you need one. Just PM me an address and it's yours.
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