The timing chain functions just as that a timing belt does. The difference between 
your two is simply the material and location. One is constructed of metal and the various other, a reinforced rubber. Though timing chains were used first, belts were introduced into automobiles in the 1960s. Belts are timing chain china quieter and because of their material, less expensive to produce. Timing chains are housed within the engine and receive lubrication from engine oil and can last a long time, while timing belts can be found outside of the engine and tend to dry and crack. In the last couple of years, however, more automobile manufacturers have included timing chains back to some vehicles with vast improvements such as a reduction in sound and vibrations, different a timing belt not all water pumps are powered by the timing chain. Check your owner’s manual to determine what kind of timing procedure your vehicle utilizes because they can vary greatly from year to calendar year and by an auto manufacturer.