We all know the purpose of RTD.
Normally winding RTD will be installed closely connection-side winding (Inside).
In-case, if anything not working, we can able to set a new RTD on the same phase at STATOR winding overhang area by dismantling Motor.
Point 1.
From your observation, nothing so serious in this machine.
Many of the 2 pole machines, normally have these kinds of Noise.
Point 2.
There is two things to highlight.
First is, journal bearing & Shaft clearance on both sides may be not equal or DE side is more clearance.
Second...
