What is the Difference Between a Timing Chain and a Timing Belt?
2 Answers
The differences between a timing chain and a timing belt are as follows: 1. Different materials: Ordinary timing belts are made of rubber, which is prone to breakage; timing chains are sturdier and less likely to break. 2. Different noise levels: Because rubber products are soft and elastic, their connection with the camshaft and crankshaft is not rigid, so they offer better noise control compared to timing chains. 3. Different replacement cycles: Timing belts have a relatively short lifespan, generally requiring replacement every 3-4 years or around 60,000-80,000 kilometers, and must be replaced on time. The 'tensioner' of a timing chain has a wear lifespan of only 80,000-100,000 kilometers and also needs to be replaced when the time comes.
The difference between timing chains and timing belts is quite significant. The chain is made of metal and has an exceptionally long lifespan, basically matching the engine's service life, so you don't need to replace it until the car is scrapped—very worry-free. However, the downside of chains is that they are noisier, especially in older cars where you hear a rattling sound that can be quite unpleasant. As for belts, they're made of rubber, quiet and smooth, with lower costs, but their lifespan is shorter. Generally, they need replacement every 80,000 kilometers. If not replaced in time and they snap, they can damage the engine, costing thousands to repair. A friend of mine learned this the hard way last year when his belt broke and bent the valves—a painful lesson. That's why most new cars now use chains, while older models might still use belts. Replacing a belt also requires changing the water pump and tensioner together, so the actual cost isn't that low.
