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Yooper Farmall

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Been stripping H parts the last couple weekends for priming and painting. Staring at the casting dates while working and getting curious. 11.12.J means that part was manufactured Nov 12th?

The tractor is a 1941, I found a table of casting code dates, it looks like J stands for 1940. The tractor serial number looks like a mid to late 1941, is it very likely cast iron parts where made in 1940 and assesmbled in 1941 or more likly borrowed parts from donor tractors?
 
It seems quite likely that late 1940 castings would be used in assembling a 1941 tractor. They were not too concerned with stock rotation of cast iron since it doesn't spoil, or so I have been told.
Zach
 
Just because the part was cast doesent mean it was built rite after that. You need to remember in those times the demand wasnt as great as after the war in 45 then the demand went out of site and production sped up fast. The B that was delivered 18 Aug had lots of cast codes dated in late July of 47 so those parts were hardly cold when the tractor was built.
 
From past experience working in a foundry, any cast poured needs to "cure" sitting outside for months. This releives any stress caused by the casting process. Those date codes are the day the part was cast, they placed a "date plate" in the mold prior to pour. This was a trace for the part in case any problems were experienced later in production. Casting was always way ahead of production.
 
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