[denisond3]

On my 92 Escort the timing belt is supposed to be replaced at 100k miles. Usually its also a good time to replace the water pump if its original - since the same procedure to replace the timing belt has to be done to replace the water pump. Its also a good idea to replace the tensioner pulley when you replace the timing belt, and the idler pulley if your engine has one. My 92 doesnt have a plastic gear in it.
At 160k miles I also replaced the tensioner pulley and the idler pulley that are used with the serpentine belt on my 1.9L engine.
And ... I replaced the timing belt/water pump/etc. again, when the car had 193k on it.