The timing chain functions in the same way that a timing belt does. The difference between the two is simply the material and location. One is constructed of metal and the other, a reinforced rubber. Though timing timing chain china chains were used first, belts were released into automobiles 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 oil and can last a considerably long time, while timing belts can be found outside of the engine and have a tendency to dry and crack. Within the last few years, however, more automobile manufacturers have integrated timing chains back into some vehicles with huge improvements like a reduction in noise and vibrations, different then a timing belt not all drinking water pumps are driven by the timing chain. Verify your owner’s manual to know what kind of timing operation your vehicle utilizes as they may vary from year to year and by an auto manufacturer.