When I build my airplane, I like to do many of the steps twice. Well, not really. It happens because I make a lot of mistakes. And this one falls into that category.
The Lycoming IO-390 installation manual clearly states, on page 26 (Rev June 2009), "If a constant speed propeller is to be used, the expansion plug must be removed from the crankshaft." I didn't do that when I originally placed the propeller. So I had the pleasure of removing and reinstalling the propeller. That's not a very difficult, nor time-consuming process. It's merely a frustrating interstitial step that imposed itself due to my neglect.
The Lycoming IO-390 installation manual clearly states, on page 26 (Rev June 2009), "If a constant speed propeller is to be used, the expansion plug must be removed from the crankshaft." I didn't do that when I originally placed the propeller. So I had the pleasure of removing and reinstalling the propeller. That's not a very difficult, nor time-consuming process. It's merely a frustrating interstitial step that imposed itself due to my neglect.
Following removal of the propeller, the expansion plug is visible on the engine crankshaft.
After drilling a 3/16" hole in the center, the plug is beaten until its shape changes enough to pull it out.
A view down the crankshaft sans expansion plug.
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