Here's what the TDM says, word for word:
To obtain a correct seat of delivery valve holder sealing rings, tighten delivery valve holder to 30Nm and release, tighten once again to 30Nm and release again, then finally tighten to 30+5 Nm. Excessive tightening may cause a leak on elements at low and high pressure end by distortion of injection pump housing.
Interprest as you wish...