@Engineer-Joe posted:If it's a really old engine, the TMCC board inside may need the settings changed?
my old SS Allegheny made all kinds of noises until I swapped out the old board for a MTH PS2 3v one. It straightened it right out. The motor was making all kinds of noises with the stock board and I didn't know it was adjustable. I thought it was binding it sounded so bad. The motor growled and groined at every start.
May not have been enough to fix it though? I yanked it out before any changes could be made.
I think you may be right. Just a video of it.