What are the symptoms of a stretched timing chain?

[AubreeLee]

The symptoms of a stretched timing chain include: engine vibration and incorrect ignition timing. The reasons for timing chain elongation: The timing chain is made of metal, unlike the timing belt which is a rubber component. Under high-temperature operation, the engine's thermal expansion and contraction cause metal fatigue in the timing chain, leading to loosening over time and resulting in a certain degree of elongation. The timing chain is composed of pins, chain plates, sleeves, and rollers. The rollers experience the most friction among the chain components. Poor-quality chains wear out quickly during use, while high-quality ones delay wear but still reach a certain limit. As the rollers become thinner, the wheelbase correspondingly lengthens.