DOUG-SR
You are having the same problem I had with my Flyer chief Berks. The pilot wheel assembly and trailing trucks are the same on both. Lionel has repaired all of mine and the last one they did came back with the pilot wheel loose in the box
Three repair orders state they had to replace the boards in the engine and the one I just got back is going to them again.I call it design flaws that they did not engineer out of the new LEGACY engines based on the problems noted on this topic.
Gunny