Chainbreaker
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Yes, air should pass from one side to the other and exit out through the louvered shutters. You should be able to feel significant air flowing out the shutters after they have opened up when running. You should also be able to see some daylight between the "Cylinders" in the middle where the two cylinders are connected as well as space between the cylinder fins on the outer most edges as well (left & right). I'm fairly sure there is also some limited airspace between the "Cylinder Heads" on top where they meet in the middle. Wherever there is a pronounced fin sticking out, it should have a way to dissipate that heat via some airflow.When I open up the louvers, I begin to think about air flow. So, the large fan on the main shaft blows into the area where my new "close when run" shroud. From there, is the air flow to go across the fins of the "head" (from right to left - from front) then out the louvers? If this is the case, I have no air flow and I can't "see" from left to right across the fins of the "heads". (I'm saying "heads", the items between the louvers and the close-to-run shroud.) See image when open the louvers.
View attachment 751376
If you are looking from the "Louvered Shutter" side You will need to have the "Close To Run" cover open to allow light through in order to see through. Easier to see though the cylinder fins from the "Close To Run" side with the cover up. If you were to inspect the cylinder fins at night you could put a flashlight on the opposite side to see if light is coming through in those finned cylinder airflow areas.
Your cylinder fins do appear quite rusted, can't tell from the photo's if they are rusted up solid. Though it is not unusual for the fins to be coated in some rust and will work Ok as long as they are not rusted solid (flaking thick rust). If you have a solid piece of wire or rod, you could probe all those areas to see if it will pass through and perhaps knock off some rust while you probe.