Genuine OEM Audi Timing Chain Guide Rail, part number 079109514B. This component is essential for guiding the timing chain, maintaining its correct path and tension to ensure precise engine timing. It functions as an upper channel within the timing chain assembly. Made from a durable, low-friction polymer, it weighs approximately 0.03 kg. Opting for a genuine OEM guide rail guarantees the correct material composition and precise dimensions, which are vital for preventing chain slack, excessive wear, and potential engine damage.