How do you change hydraulic tappets on a peugeot 206 1.4 diesel?

To change the hydraulic tappets on a Peugeot 206 1.4 diesel, first, disconnect the battery and remove any components obstructing access to the engine head, such as the intake manifold or camshaft cover. Remove the camshaft by loosening the retaining bolts in the correct sequence to avoid warping. Replace the hydraulic tappets, ensuring they are properly seated, then reassemble the camshaft and other components in reverse order, and reconnect the battery. Finally, check the oil level and bleed the system if necessary.