Can't get the squeak out of a 1952 2025 engine

Try a dab of STP. I've stopped quite a few squeaks with it. It has never hurt plastic  for me and it stays put.

  Ed

Rob,

 Did you replace the brushplate with a brand new one? It sounds like the brushplate is the culpret. The new reproduction plate available now are tight and need to be run in for a few minutes. Also the indent on the brushplate are not perfect and if you try to match the divot with the hole in the motor frame it will bind the armature. file the divot off the brushplate and use a small round file to adjust the screwholes a touch till the armature spins free.

Chuck, I can try your suggestion, but re-oiling the other side, the metal bearing plate, is what stops the squeak for a short time. I replaced both sides. I should also add that the engine squeaks on the same section of track every time for some reason. It is always at the end of a straight going right hand into a 072 curve section. It will run quietly for about 10 minutes after oiling, then begins squeaking again until re-oiled.

Rob

Try one more thing - make sure there is a film of the Lucas R&T#2 between the motor frame and the first intermediate gear(the castle gear).  This gear spins quite fast and when the gear stud is worn, it sets up some funky harmonics... and when it rattles, it squeals.  This gear is more susceptible to wheel position and loading than the armature.

If it helps anyone else in the future I found the source of the squeak. The end of the armature shaft was poorly machined and the gear was very poorly machined as well. I broke out a file and emery sanding board and cleaned them up. Over an hour heavy run time and no squeak. Thanks for all the suggestions.

Rob

A big hurray for you!!!

Marty