Genuine OEM Jaguar Valve Lash Adjuster, part number AJ813305. This component is crucial for maintaining the correct clearance between the valve stem and the rocker arm, ensuring precise valve timing and reducing engine noise. It is located within the cylinder head, as part of the valve train assembly. Weighing 0.02 kg, this small but vital part contributes to engine efficiency. Using a genuine OEM valve lash adjuster ensures factory-specified tolerances for optimal valve operation, preventing premature wear and maintaining engine performance.