I've seen it posted several times now that people have replaced their cam chain tensioner for one reason or another. On poster even mentioned his tensioner went bad. My question is, "how can the cam chain tensioner go bad". I'm putting my 426 back together after a total rebuild including crank, crank bearings, new cylinder, piston, rings, intake valves and exhaust cam. Notice I didn't mention cam chain or cam chain tensioner. Before installing the cam chain tensioner the other night I took it apart to ensure it was clean and working properly. I'm no expert on cam chain tensioners but I could not see how one could wear out. The spring is in good shape and there is nothing else in there to wear out. A sleeve, a threaded rod and a piston along with a retaining clip and retaining washer. The manual does not talk about dis-assembly and re-assembly but it doesn't look like there is much to it. Anyway, when putting it back together I found I could not get the tensioner to extend enough to put tension on the cam chain. I inspected the cam chain carefully and found it to be extremely worn to the point that each link/pin had several thousdands play. A few thousdands by itself is not much but when multipled by a hundred links or so it adds to up to quite a bit. I've got a new chain on order but I did not replace the tensioner. Can anyone convince me of something in the tensioner that can go wrong and why I should replace it?