How do I replace a timing belt back on? Because the belt broke off?

If this is an interferance engine I would check for bent valves

To replace the timing belt on a 2002 VW golf 2.0, first remove the old timing belt. Loop the new timing belt under the crankshaft sprocket and engage the belt teeth within the sprocket. Maneuver the belt into position on the idler pulley, water pump and camshaft sprocket, then install it around the tensioner. Tension the belt by using snap-ring pliers to turn the tensioner counterclockwise until the upper marks align; make sure all the belt's slack is at the tensioner roller before you do this ----------- lightdeal

try www.alldatadiy.com for pics