You probably already know but the serial no. indicates the date it was made. 4 being the year but you have to estimate the decade so could be 1964. 246 being the day of the year. The 0 at the end is usually a letter indicating which manufacturing line it came off. That being said, without the 143 prefix, I don't believe it would have been sourced from Sears. The Sears motors always would start with 143.**** and non Sears regular tecumsehs started with the model, i.e.. H60 . Rick
edit; check again if maybe the last digit in the trial is a "D" rather than a zero. They can look really similar. What about paint matching the tractor? Of course the shroud could possibly have been changed too meaning the engine could still be original but the shroud could be from another motor.
I have a friend in Oklahoma who has the 647 tractor and manual.
Edited by 69L46Vert, August 03, 2014 - 09:54 AM.