The timing chain functions just as a timing belt does. The difference between the two is simply the material and area. One is made from metal and the various other, a reinforced rubber. Though timing timing chain china chains were used first, belts were presented into vehicles in the 1960s. Belts are quieter and because of their material, less costly to create. 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 have a tendency to dry and crack. In the last few years, however, more vehicle manufacturers have built-in timing chains back to some vehicles with vast improvements such as a reduction in noise and vibrations, different then a timing belt not 
absolutely all water pumps are driven by the timing chain. Check your owner’s manual to determine what kind of timing procedure your vehicle utilizes because they may vary from year to 12 months and by a car manufacturer.