[tojo]

so i was pulling out of the driveway a week back and my serpentine belt fell off. checked everything and it turns out the knob that holds my tensioner in place broke off. so i got a new one and put everything back together. well the serpentine belt fell off again. i not to up to date with car mechanics and all that jazz but i know enough to know that you shouldn't be able to push the belt down more then a 1/4 of an inch when everything is in place. but i can push it down at least an inch and that is with the new tensioner. so i returned the old one and put the new one in. same problem still occurs. anyone have any ideas as to what i can do to solve this problem? thanks. my first post also.