A timing belt, timing chain, or cambelt is a part of an internal combustion engine that synchronizes the rotation of the crankshaft and the camshaft so that the engine's valves open and close at the proper times during each cylinder's intake and exhaust strokes. Loss of timing belt tension may lead to major engine damage. Water pumps driven by a timing belt should be replaced when changing the timing belt.
The timing belt is located inside the engine which requires several steps to get to the timing drive, making timing belt and timing drive component inspection difficult. Because the belt cannot be seen when opening the hood of a vehicle, the average consumer may forget or not even realize the importance of timing belt maintenance. The timing belt is often referred to as “The Forgotten Belt”.