I think I know the answer to this, but would like an experienced hand but confirm. I am attaching a picture of my rocker arm and the matching cam lobe.
I was doing a valve adjustment today when I noticed this abnormal wear on a rocker. I had to take the arm off because the ball pin was too tight for a crow foot wrench and used a socket to turn the ball pin. On the rocker, the wear surface has been "chipped off" on the forward edge of this and most of the rockers. There is a definite cliff when you run your finger nail over it. That wear surface is a grayish color and looks to be a surface coating. The mating surface on the cam is not "chipped' but actually feels slightly raised. It feels like the rocker surface chipped or wore of onto the peak of the cam lobe.
I replaced the rockers about a 1-1/2 ago (1500 miles) when replacing the ball pins. The cam is original. I bought the rockers from an well-known aftermarket company. Is it possible that they are defective? I didn't use a cam break lube at the time thinking it wouldn't be necessary. Is that correct? What to do now? I think I should replace the rockers (from MB this time!)immediately and maybe LIGHTY file the cam lobe to remove the built up area on the cam lobe. I don't think the cam's hardened surface was disturbed but rather the rocker's softer wear surface was deposited on the cam.
Help please!