i have a very loud knocking noise coming from the head so i removed the cam cover i was going to remove the tappets to check to see if the noise was coming from them. i noticed that the vvt chain tensioner can be moved by hand and when i cranked the engine it would go up and down. the car has not being started for 2 weeks and has no oil in it for 3 days. should the tensioner be able to move or should it be solid