Bought it a while back and when I took it apart, what a mess. Someone removed the piston and rod and probable belted it up to another source of power so the pump jack stayed in operation. Now it's yard art. Shows how you can get fooled by appearances. The crankshaft bearing bolts were tightened to give the impression it was stuck.
Got my money back and kept the engine. Now it's on display on the ditch bank.

Dave