Re: 9N serial number

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Posted by Tim Daley(MI) on August 28, 2019 at 04:07:10 [URL] [DELETE] :

In Reply to: 9N serial number posted by Jay Fauver on August 27, 2019 at 20:47:26:

HiYa Jay-
Are you looking in the right place for the serial number? Often fellas see a casting number on a part and assume it is the serial number. The engine block serial number is hand-stamped on a boss cast behind the oil filter housing near the head. ALL 9N and 2N tractor models had the "9N" prefix in the serial number. There will be a STAR symbol ( ™ ) before and after the s/n. There was never a "2N" stamped prefix on serial numbers. Why did you assume they were only 5 digits? If you meant that only the 9N models had 5 digits, thatfs because they were. Serial numbers were stamped in a sequential order beginning with #1 and by October, 1942 when the 2N Model was released, still had 5 digits, though would have the 9N prefix. Itfs just how production of engine blocks ran. Herefs how it worked: Engine blocks were cast at the Rouge Plant without any serial numbers stamped; those came later. Blocks were set aside in a hold area to ecuref for 30 days. Itfs just the nature of the beast. Cast Iron requires a 30 day ggreenh period of which to cure otherwise it is too brittle to machine. It is similar to seasoning wood. If you cut green wood, it wonft burn. It must be seasoned for a period before it will. The next step is to pull engine blocks that have cured at random from the hold area to the machining area. Engine blocks get fully machined, cleaned, and then set in another hold area, still unmarked. Next, blocks get pulled at random to the engine assembly area where they are fully assembled and sent to yet another hold area. Once assembled, engines get pulled at random to the QC Test Area where they are put on special machines to be fully tested for function and gone through a break-in period. If and only when the engine passes QC Inspection/Testing is it then given a hand stamped serial number and gone to another hold area at random, to then wait to be pulled for final assembly on the line. Serial numbers are stamped in sequential order, BUT they are not maintained in any particular sequential order. A functional, assembled QC approved engine was of no concern to staying in any particular order. If at QC Testing an engine failed, it was either sent to a repair shop and retested or if unusable, would be scrapped out. Thatfs why one shouldnft concern themselves with serial numbers. It doesnft mean a whole lot. Its only purpose was to ID the engine block whose serial numbers were technically meant to ID the vehicle serial number. Since many engines were swapped out if a vehicle had a blown engine, it is possible to have an early 9N tractor with an 8N engine block and/or vice-versa. There were engine block date code ID tags attached to the starter pockets at some point, maybe with the 8N, which did ID the exact date on which the block was cast, but only that. It was not built on that date nor was the vehicle built on that date. So, trying to pinpoint the exact date on which YOUR tractor was built is a futile point. Thatfs why I say s/nfs really mean nothing. They only ID the engine block. A block may have been cast on January 25th, but not assembled and tested til February 25 or later, and then serialized, but not assembled on a vehicle until March 25. See? Thatfs the short version of the FORD process for all modules.


Tim Daley(MI)

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