Thanks for the reply Chuck. The one i have was not noisy before with the old cam. Should I just run it? Id say it moves about an 3/8 of an inch back and forth, maybe a lil more. Were you running a mech pump on it or no? My fear is if it is that loose, will it create metal shavings in time? From what im reading and seeing online the slop is sort of common.There's a fair amount of play in the eccentric. It's hard to know what is too much. I replaced mine a year or so ago because it was noisy. When I put the new one on, it didn't feel perceptibly different than the one I replaced, but my noise went away.