The timing chain functions just as that a timing belt does. The difference between your two is simply the material and area. One is constructed of metal and the additional, a reinforced rubber. Though timing chains were used first, belts were introduced into vehicles in the 1960s. Belts are timing chain china quieter and because of their material, less expensive to create. 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 beyond the engine and have a tendency to dry out and crack. Within the last couple of years, however, more automobile manufacturers have included timing chains back into some vehicles with vast improvements like a reduction in sound and vibrations, different then a timing belt not all drinking water pumps are powered by the timing chain. Verify your owner’s manual to determine what kind of timing operation your vehicle utilizes as they may vary from year to 12 months and by an auto manufacturer.