Genuine OEM Jaguar Step Tappet, part number C2C40074. This crucial engine component is responsible for transferring motion from the camshaft to the valve stem, ensuring precise and controlled opening and closing of the engine valves. It sits as part of the valve train assembly, directly above the valve spring. Weighing approximately 0.037 kg, this small, cylindrical part is engineered for high precision. Using a genuine OEM step tappet ensures correct tolerances, material hardness, and hydraulic function, which are vital for smooth engine operation, reduced wear, and optimal valve timing.