Genuine OEM Volkswagen Timing Chain Tensioner, part number 03E109507S. This vital engine component is responsible for maintaining the correct tension on the timing chain, which synchronizes the camshaft and crankshaft. Proper tension is crucial for precise valve timing and overall engine efficiency and longevity. Located within the engine's timing cover, this metallic tensioner weighs 0.214 kg and measures 0.1m in length. Choosing a genuine OEM timing chain tensioner ensures exact hydraulic or mechanical specifications, preventing premature wear, chain slack, and potential catastrophic engine damage.