Genuine OEM Audi Toothed Belt Pulley, part number 078109111B. This critical engine component guides and drives the toothed belt, ensuring precise engine timing and operation. It is typically found within the engine's timing system. Weighing approximately 0.7 kg with dimensions of 0.131m x 0.131m x 0.032m, it is constructed from durable metal. Choosing a genuine OEM toothed belt pulley ensures exact tooth profile, material hardness, and dimensional accuracy, which are crucial for preventing premature wear and maintaining optimal engine performance.