Does the timing chain need to be replaced?

[SimonRose]

The timing chain should be inspected periodically based on usage conditions and environment, and replaced if necessary. Generally, as long as the timing chain is not stretched to the point of failure, it may not need replacement. Here is some relevant information about timing chains: 1. The timing chain is an upgraded replacement for the timing belt. Under normal usage conditions, it is maintenance-free for life and has the same lifespan as the engine, so it does not need replacement. 2. The main function of the engine timing belt is to drive the engine's valve train, ensuring that the intake and exhaust valves open and close at the appropriate times to allow normal air intake and exhaust in the engine cylinders.