I recently purchased a 1942 9N to grade the dirt roads around my house, The tractor runs great, and works well. I love it and it goes well with my obsession for vintage things.
I have a question about it though, on the transmission case just below and slightly ahead of where the oil bath air cleaner hangs is a 9/16th " hole in the case. I can't seem to figure out why or what should have gone here and I imagine it can't be healthy to be left open in the dry dust out here. Can any one identify what it's there for and what I' am missing? Now I am reluctant to run the tractor until I know what it is/what I'm missing. Any help would be appreciated.