Is the 2021 Buick Excelle equipped with a timing belt or chain?

[SanOmar]

The Excelle engine utilizes a timing belt design. In fact, with advancements in timing chain materials that prevent stretching and the widespread adoption of hydraulic tensioners, timing chain designs are becoming increasingly common. Here's an introduction to timing belts: 1. Function of timing belts: When the engine is running, the timing belt ensures synchronized operation by coordinating piston movement (up and down), valve opening/closing timing, and ignition sequence under "timing" connection. 2. About timing: Timing refers to the engine's mechanism that precisely aligns each cylinder's piston reaching top dead center, valves closing, and spark plug firing simultaneously. 3. Timing belts are consumables: If a timing belt breaks, the camshaft will lose synchronization, potentially causing severe damage from valve-piston collision. Therefore, timing belts must be replaced according to the manufacturer's specified mileage or time intervals.