What is a key difference between a timing chain and a timing belt?

A timing chain is indeed made of metal links, which is a fundamental characteristic that differentiates it from a timing belt. This construction is one of the reasons timing chains are typically more durable and have a longer lifespan compared to timing belts, which are often made from rubber or a similar composite material. The metal links in timing chains provide greater resistance to wear and tension, allowing them to withstand the demands of engine operation better over extended periods.

This inherent strength and design can result in timing chains needing replacement less frequently than timing belts, contributing to their overall longevity in an engine's lifespan. However, it's important to note that while timing chains are generally more robust, they can be accompanied by complexities in replacement due to their placement within the engine and the additional components involved, which can affect overall repair costs and procedures.

The other options highlight misconceptions about the comparison between timing belts and chains, including durability, maintenance frequency, and costs associated with replacement. Understanding the physical construction of these components helps in appreciating their roles in engine operation and maintenance requirements.