That seems to depend on the rig. I've seen and heard of guys bending connecting rods from trying to start the engine after a rig has been on its side. My Samurai fires up right away with no problems, but the engine is out of a 97 Suzuki Sidekick, with only 79,000 miles so must be tight. I've heard people say that if the engine has worn oil control rings, then the oil drains on top of the piston, and if you turn the key, damage can happen. The safest thing to do is pull the plugs and spin the engine over to blow out any oil that may have drained on top of the pistons.
