Tony, You have a lot of knowledge, and have helped me and many others, but I think you've got the information about the casting codes incorrect. If a casting code of C0NN means a 1960 tractor, then why do the 1962 S-O-S tractors have a casting code of C0NN on their transmissions? Shouldn't the casting coed on those be C2NN then? You just got through explaining that the C0NN transmissions were used on 1962 tractors didn't you?
My 1973 4000 has casting codes of various years and even a couple of different decades on all of the different major components. My transmission, which has the same 1973 serial number and production code stamped into it as the number on the foil sticker under the hood, has a C7NN casting code, while my engine has a D0NN casting code, yet my tractor is a 1973, and the transmission and engine are both original. The production codes stamped into every major component match the numbers on the foil sticker, yet the casting codes on the various components indicate different years.
I have seen explanations on the web from former Ford engineers that the first 2 characters in the casting codes designate the decade and year within that decade that a particular casting was designed, not when a particular machine was made or when a particular part was cast. A particular casting design might have been used for many years in a row, so it will show up as the same casting number on machines of many different years.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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