Not normal.....normally the motor bearing will outlive an EV and in most cases its owner. Something is wrong.I had the bearing replaced and it sounded much better, much quieter.
Now, about 3 months later, the motor is making the same loud bearing noise that it did before.
Yeah, I suppose, but unlikely. However it may have been damaged from improper assembly.My questions are:
Could I have received a bad bearing?
Ohhhhh! You got a bent shaft? I guess that is a question by you, not a statement. But get it checked.Could the shaft be bent and put undue stress on the bearing causing it to be louder?
I suppose.Could the bearing be improperly seated in the front motor mounting plate?
I suppose.Could the motor and trans be out of alignment to such an extent that the bearing is overstressed?
I suppose.Could there be some other reason or cause for this bad bearing noise?
Cool. That can compensate for a few thou misalignment, but not a bent shaft.I am using a Lovejoy spider coupling with a plastic insert that should compensate for a small misalignment.
Get your bent shaft fixed. And the rest of the system inspected and/or assembled by a machinist or professional.To fix the problem, I've got to take most of the system apart. I would like to replace the bearing but I'm afraid that the new bearing will also fail.
Also, post up some pics.