The timing chain functions in the same way a timing belt does. The difference between your two is simply the material and location. One is constructed of metal and the additional, a reinforced timing chain china rubber. Though timing chains were used first, belts were released into vehicles in the 1960s. Belts are quieter and due to their material, less expensive to produce. Timing chains are housed within the engine and receive lubrication from engine essential oil and can last a long time, while timing belts can be found outside of the engine and tend to dry out and crack. Within the last few years, however, more automobile manufacturers have included timing chains back to some vehicles with huge improvements such as a reduction in sound and vibrations, different then a timing belt not all water pumps are driven by the timing chain. Examine your owner’s manual to determine what kind of timing procedure your vehicle utilizes as they may vary from year to year and by an auto manufacturer.