The Timing Belt is the belt that controls the camshafts in your engine, opening and closing valves at just the right time for smooth operation. The timing belt has teeth that turn the camshaft in time with the crankshaft. Some cars and trucks use timing chains or gears, which are more durable.The Timing Belt is the belt that controls the camshafts in your engine, opening and closing valves at just the right time for smooth operation. The timing belt has teeth that turn the camshaft in time with the crankshaft. Some cars and trucks use timing chains or gears, which are more durable. The Timing Belt is the belt that controls the camshafts in your engine, opening and closing valves at just the right time for smooth operation. The timing belt has teeth that turn the camshaft in time with the crankshaft. Some cars and trucks use timing chains or gears, which are more durable..The Timing Belt is the belt that controls the camshafts in your engine, opening and closing valves at just the right time for smooth operation. The timing belt has teeth that turn the camshaft in time with the crankshaft. Some cars and trucks use timing chains or gears, which are more durable.