Timing belts are a critical engine component synchronizing crankshaft and camshaft rotation for precise valve and piston timing. Located within the engine’s front cover, these belts utilize reinforced rubber construction with accurately spaced teeth to maintain this synchronization. Interference engines require precise timing; failure results in catastrophic internal damage. Modern designs often incorporate multiple layers and heat-resistant materials for extended service life. Replacement intervals are typically specified by vehicle manufacturer and based on mileage or time, due to the belt's susceptibility to wear and cracking.