Reply to "TMCC engine speed limit setting"

 I still have a few engines with EOB. One thing I learned early on with a runaway at times engine. If you are running steam. Turn off the EOB. The engine should run okay. If the chuff signal is triggered by the tach reader.  If you notice it missing chuffs or no chuff at all at times. There is something wrong in either, the tach reader gap, the reader itself, or the flywheel tape. 
 My problem engine was the way the tach reader mounted to the motor.Ran fine most of the time. For some reason the gap didn’t stay consistent. Just adding the slightest downward pressure kept the chuff consistent. This was accomplished with a roller base.  A simple brace seemed to work to steady it and fixed the problem.