So, why is prayer essential in Adeptus Mechanicus repair procedures?

So, okay, I know that the Adeptus Mechanius tends to pull out the prayers and rites for repairs? Sure, there are daemons in universe which is why sometime the prayers are needed for things like Gellar Fields and Warp Drives (you need that since well, Daemons and warp malfunctions go hand in hand) but for changing out tracks or other mundane stuff?