Model 407777, type 0137 E1, code 991030YH. The engine was stuck when I got it on a free Yard Man tractor last fall. I started stripping it down. I got all the exterior parts of including the heads. I put a box end wrench on the flywheel nut and with little effort got the engine to rotate. Just one cylinder has rust in it but both pistons go up and down without any problems. I can feel a tiny bit of lateral movement in the crankshaft at the flywheel end of the crank. Does anyone know if there is an actual roller bearing on that end of the crankshaft? The tractor is stripped down and parted out. I think the tractor sat for a while before I got it. I am selling this. I am wondering if it would be fairly easy for another person to hone the rusty cylinder and use this engine short block? I will post pictures later tonight.