Been having a rattle noise when cold from the front of the engine , i replaced the serpentine tensioner after another noise . But after that another noise started. To check its not the timing belt tensioner or waterpump i decided to run without serpentine belt on to exclude this. so today i pulled the serpentine belt off to day when cold and fired up , no noises at all . I have lightweight pulleys on . I manually turned alt one ,fan and the bottom centre and bottom right all seem tight and spin freely with no noise. However the top one feels like a bit of play and makes a light knock when quickly turned left and right with fingers is this normal ?