Ron,
I now seem to remember and can validate when I get home. Take out the 4 bolts I mentioned above, then turn the engine right side up and lift up the top of the boiler. If I remember correctly, the boiler separates just under the walk platform along the side of the boiler, so really, this engine has a boiler that is cut across the middle, and when you pull the top off, the smoke unit comes with it.
If this doesn't work, I'll take mine apart tonight and attach pictures.
