Timing chains serve the same purpose as a belt, but usually lasts quite a bit longer. Some manufacturers suggest replacing it at certain intervals, but others state that it will last as long as the car itself. The timing chain looks similar to a bicycle chain, and as you might expect, it’s noisier than a belt. The other problem with timing chains is that if they do break, they’ll usually cause a lot more damage than a broken belt. [...]
Always refer to your maintenance book when determining when to replace your timing belt. The general range is every 60,000 -100,000 miles. However, it’s better to replace your timing belt before it snaps because then it will damage your engine and require you to spend even more money.
The timing belt has the main responsibility to synchronize the camshaft and crankshaft to allow the fuel to ignite in the combustion chamber. In order for this process to take place, valves and pistons need to be in the correct position. Without a timing belt, the car will not be able to start.