Problem on 5th speed Peugeot Citroen manual gearbox 1.6HDI

Problème 5ième rapport boite vitesse manuelle Peugeot Citroën 1.6HDI
Parts part number :
Nut M20x1.5, same for primary and secondary shaft : 230459
Steel cover : 220795
Torques :
M20 nut : 73N.m±5
M6 : 15N.m±2
To tighten the nut, the crankshaft wheel must be blocked with a rod which must be engaged in the gearbox near the flexible pipe of the exhaust.