How do you change a hdi crankshaft pulley 306 hdi?

To change the crankshaft pulley on a Peugeot 306 HDi, first, disconnect the battery and remove any components obstructing access, such as the engine cover or belts. Use a suitable tool to remove the central bolt securing the pulley, which may require counter-holding the crankshaft with a tool to prevent it from rotating. After removing the old pulley, install the new one, ensuring it is aligned correctly, and then reassemble everything by reversing the disassembly steps. Lastly, reconnect the battery and start the engine to check for proper operation.