Hi I want to check the shaft alignment on my boat. I found this video on youtube: https://www.youtube.com/watch?v=5UqniaiggKA.

In this video the guy says that the clearance between the shaft and the shaft log ( where the shaft goes though the hull) must be checked.
So do I have to remove the dripless shaft packing to be sure that the shaft is in the center of the shaft log or just by removing the coupling bolts the shaft will be in its natural position and automatically there will be a clearance between the shaft and the shaft log?