HA HA HA.
I did try turning an engine over once with an impact wrench. My friend found a 1.0 hp outboard boat engine. It was having trouble starting becasue of weak ignition and the starter rope just wasn't enough. I tried the battery drill and that wasn't any better. Then I tried an electric drill, that was better but the engine was kicking back and I was worried that it would strip out the gears in the drill. I got out my impact wrench and put that on. Man did it turn it fast. All of a sudden the impact wrench went from "ba burr, ba burr, ba bur, ba burr," to "ba reeeeeeeeerrrr." I moved the impact wrench away to see why and the top of the crankshaft was sheared off with the nut at the top of the flywheel.
At the time I thought it was funny but Anthony was so pissed he took the little engine and tried to beat me with it.