When repairing these PW units, I see the air piston going up and down in the cylinder below the smoke pot that has the resistor. There is a hole in both that aligns to let air get forced from the piston to the smoke pot (chamber) and push the smoke out the smokestack. A gasket is between the smoke unit and the engine boiler. These communicating holes are what usually needs to be cleaned when repairing these units.
There is a air gap between the piston unit and the smoke chamber so the 2 communicating holes are not sealed.
Should there be one? I cant find any part like that in the repair manual. Would adding one improve the smoke output? It seems this gap would be a leak path for the air. But maybe its also there to provide an intake for air.
Thoughts?
