2. In Peugeot workshops, the scale is adjusted using a special tool, which you can easily make yourself from a rod with a diameter of 8 mm and a length of 130 mm.
3. Remove the plug from the timing case (immediately above the cover above the end of the crankshaft) (see photo). Turn the crankshaft using a wrench placed on the bolt of its pulley so that one of the notches on the pulley flange aligns with the second notch on the installation scale (the crankshaft turns clockwise when looking at the pulley). Insert the rod into the hole in the timing case and slightly rock the crankshaft so that the rod enters the slot on the crankshaft cheek and locks it in the TDC position for cylinders NN 2 and 3. If the rod does not fit into the slot, pull it out, rotate the crankshaft 180° and align the second notch on the pulley flange with the notch on the installation scale. Make sure that the rod does not fall under the timing case.
4. With the crankshaft locked in the TDC position, you can check the accuracy of the adjustment of the setting scale. If the notch on the pulley does not exactly align with the second notch on the scale (the first notch on the scale is designed to set the ignition timing at 8° or 10° BTDC), loosen the scale mounting bolt, carefully move the scale until the mark on the pulley exactly aligns with the second notch on the scale, and retighten the bolt. Once the scale is adjusted correctly, erase the old mark and apply a new one with paint.
5. Pull out the installation rod and install the plug in place.
Material copied from the resource peugeotbook