IF THE BELT JUMPED OR BROKE ,I AM AFRAID IT IS NOT GOING TO BE A PRETTY SIGHT , WHAT CAN CAUSE THESE BELTS TO BREAK , HAVE NEVER SEEN ONE JUST COME OFF , USUALLY WHAT HAPPENS IS THE TENSIONER IS NOT SET CORRECTLY , THIS ENG DOES NOT USE A HYDRAULIC TENSIONER, ONCE IT IS SET IT IS LOCKED , AND IT IS VERY EASY TO GET IT TOO TIGHT AGAINST THE BELT ,, HOPE FOR THE BEST JERRY