See Figures 1 through 6
Toyota recommends that the timing belt be replaced on vehicles that are used in extensive idling or low speed driving for long distances. Police, taxi and door-to-door deliveries are commonly used in this manner. The timing belt should be replaced every 60,000 miles (96,000 km) in these cases. Toyota trucks do not have interference engines; where engine damage will occur if the belt snaps. If your vehicle has high milage, you may want to consider replacing the belt to prevent the possibility of having it snap. Or if your engine is being overhauled, inspect the belt for wear and replace if needed. In the event the belt does snap while you are driving, turn the engine OFF immediately. Engine and Engine Rebuilding has removal and installation procedures available.