So I got the pan off and was getting ready to take out the oil pump and everything else. And I think I may have found what the knock was, the oil pump chain is so loose that if the guides it looks like it would come right off the sprokets. I know this cant be normal. It looks like it may have been slapping up against the case right where I was hearing the knock next to rod 4. How could this become so loose, or is it suppossed to be loose. I know it isnt suppossed to hit the case. What gives guys?