Camshaft cover

[Wharton]

I am looking for a proceedure to remove the camshaft cover to inspect the camshafts and valve train. I am not sure what is under it and I am a bit reluctant to open it without some confirmation of what has to be done. After a rallye this weekend there is some metallic rattling in the area and I'm not sure what is causing it. At first it sounded like lifter knock, until the hood was opened and then became very loud. The oil is at the correct level and pressure is up. Seems to run fine except for the rattle.
If anyone has something simple let me know