A Timing Chain is a part of an internal combustion engine used in a car that helps the crankshaft and camshaft of the engine rotate in unison. In order to make sure that the engine's valves open and close at the appropriate times throughout its cycle, it is a metal chain that is driven by the crankshaft and, in turn, drives the camshaft. The Timing Chain is a crucial part of the engine and is made to last for the entire engine's life.