Serial numbers on Ford tractors are stamped on the engine block. You can usually locate the serial number on a flat part of the engine casting, just above the oil filter on the left side.
Serial numbers on N-Series Ford tractor engines have been hand-stamped on an assembly line and may use odd characters, such as a 6 that looks like a lowercase letter b, which can make them hard to read once located. 9N serial numbers include small star symbols stamped at the beginning and the end of the number sequence. Some 8N serial numbers include diamonds.
For Ford 2000 through Ford 5000 tractors, the serial number is located on the right side of the engine on the flywheel housing behind the starter motor.
Serial numbers indicate when the engine was manufactured. 9N serial numbers indicate manufacture between 1939 and 1947. 8N serial numbers indicate manufacture between 1947 and 1952.