Genuine OEM Jaguar Secondary Upper Timing Chain, part number AJ814104. This vital engine component is responsible for synchronizing the rotation of the camshaft(s) with the crankshaft, ensuring precise valve timing for optimal engine performance and efficiency. It is positioned as an upper secondary chain within the engine's complex timing system. Weighing 0.235 kg, a genuine OEM timing chain is manufactured to exact factory tolerances, providing reliable, long-lasting operation and preventing catastrophic engine damage.