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 other, a reinforced rubber. Though timing chains were utilized first, belts were introduced 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 essential oil and can last a considerably long time, while timing belts are located beyond the engine and have a tendency to dry out and crack. Within the last couple of years, however, more automobile manufacturers have built-in timing chains back to some vehicles with huge improvements such as a reduction in sound and vibrations, different then a timing belt not absolutely all water pumps are powered by the timing chain. Check your owner’s manual to determine what kind of timing operation your vehicle utilizes because they may vary from year to season and by an auto manufacturer.