Thanks to all who helped answer my questions.
I just wanted to add that when I attempt to run the engine the cab light blinks 3 times without my doing anything with the remote other than to start up the engine. That is; there are 3 blinking cab lights without me, using the remote, to turn on the smoke. The engine responds to all other commands.
RickO...I plan to us a feeler gauge to measure that distance. Thanks for your advice on that matter.
Steve