This is for you other people who pull your engine to work on it ( at least you Air Cooled folks - I don’t know Subaru engines ).
Under the cylinders on both sides of the engine and right in between the barrels is a small, 4” square piece of tin that is positioned in the middle to literally snap onto the long head bolts to hold it in place. I assume that it is there to deflect the fan air sideways across the bottom of the cylinder barrels to eliminate hot spots on the bottom. You pick it up, position it and snap it in - Takes maybe five seconds.
On my engine, one side was in there nice and tight, while the other side was flopping around loose, so once the pushrod tubes were out of the way I tried snapping it back in to clip onto the head bolts, but it wouldn’t latch in and stay put. I must have screwed around with that thing for over 30 minutes and STILL couldn’t get the thing to clip on.
About that time, Kathy wandered out there asking if I wanted to walk around the ‘hood, so I gave the engine a disgusted look and we took off. When we got back, I went back in to make sure everything was turned off, but that little piece of tin was jeering at me, telling me that it had won, so there! I went over there, picked it up and, believe it or not, it snapped right in, first shot, in less than 5 seconds.
Friggin Lawnmower engine, anyway…..