2. Unscrew the distributor clamp bolt and remove the distributor and its clamp.
3. Loosen and remove the 17 bolts securing the timing case to the engine and remove the case. If it doesn't move, you can gently tap it with a soft-faced hammer.
4. Be aware that if the crankshaft is turned after the chain has been removed, there is a risk that the pistons will hit the valves. Similarly, you cannot turn the camshaft with the chain removed and any of the pistons in the TDC position. Therefore, we recommend a specific procedure for removing the valve timing mechanism. However, if you only need to replace the timing chain, there is no need to remove the sprockets.
5. Unscrew and remove the bolt at the end of the crankshaft. If necessary, block the crankshaft from rotating by inserting an 8 mm diameter rod into the hole located immediately above the crankshaft and inserting this rod into the slot made in the counterweight cheek (in this case, pistons NN 2 and 3 should be at TDC). After removing the bolt, pull out the rod.
6. Bend back the petals that secure the 3 camshaft sprocket bolts. Loosen the bolts, but do not remove them yet.
7. Unlock the timing chain tensioner and remove tension from the chain (see figure 10). Remove the 2 tensioner mounting bolts and remove the bolts and tensioner. Remove the bolt at the bottom of the tensioner plate and remove the plate from the block. Remove the fine filter from the tensioner mounting hole in the cylinder block.
8. Remove the chain from the crankshaft and camshaft sprockets.
9. Remove the sprocket, worm gear and spacer rings from the crankshaft, noting the order in which they were installed and which side they were installed on.
10. Loosen the camshaft sprocket bolts and remove the lock plate and sprocket. During assembly, the locking plate must be replaced with a new one.
Source available here (peugeotbook.ru)