That is a date code. The 1 is actually the letter I. After about 1948 Ford quit using the letter I in date codes, but I've seen a few date codes using the letter I on early 8N's. Your date code I237 calls out the date September 23, 1947.
That combined with your serial number that you listed in another post confirms your engine is out of an 8N built in 1947.
Re: 9N help needed in reply to Jim.UT, 10-13-2012 17:50:37
except for the engine the tractor is early 9N. aluminum steering column, trans. cover, hyd. quadrant. snap in battery cover, no dipstick to check tranny oil level and of course the smooth hubs and a few other things. there are good used rims for sale on ebay in iowa. about 1000 miles from me. long road trip mebbe ? gotta think about that one.
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