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Marc Haibeck · 12-11-2012

I first saw a lobe with that wear pattern about ten years ago. The worst thing about it is that the lobe is actually pitted or maybe chipped on the high end of the tip. Since then after having the cam covers off of maybe 100 engines I have seen it about two additional times. We put those cams back in service long ago and there has been no repercussion. I would not be too concerned about it.

My theory as to what is happening. I wonder if the lifter is lofting and then smacking back down on the lobe. If that is the case, excessively long time with engine speeds over 6000 rpm or a weak valve spring could promote the problem.

12-11-2012	#6
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 255	Re: An Abberation in Cam wear I first saw a lobe with that wear pattern about ten years ago. The worst thing about it is that the lobe is actually pitted or maybe chipped on the high end of the tip. Since then after having the cam covers off of maybe 100 engines I have seen it about two additional times. We put those cams back in service long ago and there has been no repercussion. I would not be too concerned about it. My theory as to what is happening. I wonder if the lifter is lofting and then smacking back down on the lobe. If that is the case, excessively long time with engine speeds over 6000 rpm or a weak valve spring could promote the problem.