D600 inlet gasket
 

I was doing a good lookover today and noticed there was some pieces missing from the inlet cover gasket for the manifold. I know diesels are picky about getting good debri free air. It runs great and I don't know how long it's been like this. I was able to take a feeler gauge and it went all the way in the cover so I know there's pieces missing. I hope they went outside and not inside! I'll order the new gasket monday morning. Is there anything I should look for when I take the cover piece off?