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One of the most important and vital parts of your vehicles engine is the timing chain. The timing chain or set of timing gears is used to synchronise the rotation of the crankshaft and the camshaft. This synchronisation ensures that the engine's valves open and close at the correct times in relation to the position of the pistons. Manufacturers recommend replacement at certain age and mileage to minimise engine failure. Also many other factors have to be taken into account; has the vehicle been warmed up correctly, has the correct maintenance procedures been carried out at the specified times, has the correct engine oil been used? If you notice your engine is rattling more than usual this may be an indication that the chain has stretched or the guides and tensioner are worn and need replacing.