There is a 316 parts tractor for sale close to me for $200.00. It has an 18 HP Onan which I found some 316's came with. I am thinking about buying it just because it is cheap. The owner has the tractor in pieces because he said the transmission is bad, all the parts are there in boxes. Does anyone know if the engines and drivetrain are the same in a 316 and a 318? Is there anything else that is different?