Since M and super series are my favorate size farmalls I always compare parts from working on them and always have questions. After half a lifetime or more a lot don't have all the original parts. One thing that leads to confusion is when IH made a new part that would fit a older model, most times the new part would end up being the replacement part for earlier models. Like camshafts if you look at the later partsbooks printed after changes a M through 450 may show the same part #, but that may not be the same part # as original part to some of the tractors. The following is some information I found over several years. IH service bulletin no S-7810 dated 2-15-55. Camshaft # 48196-D is revised in that the intake and exhaust cams have been changed to permit revised valve timing and longer period of valve opening. Reason to accommodate new C-264 engines for 400 series tractors. New part # is 48196-DA. Previous cam 48196-D was used in M, SM and SMTA tractors. 48196-DA was used on farmall 400 C-264 and farmall 450 C281 from engine # 501 to 9860. Next IH bulletin # S-9274 date 10-17-57 Camshafts for production or service C-152, C-164, C-169, C175, C-248, C-264 and C-281 are revised in that camshaft threads have been changed to left hand with new nut included. Start in production tractor F-450 serial # 12652 engine # 9861. (That would be in August of 57) New cam # is 48196 DB, on orders for previous camshafts furnish 48196 DBX camshaft assembly with nut.( notice the threads was only change in cams from 400 and early 450 to later 450) Part numbers for cams are part book numbers and camshafts may and will have a different # on them if readable. Think IH got some cams from outside vendors also that may be # different. One last bit of info, Blue Ribbon Service form GSS-1170, title C-264 engine SMTA and SW6TA, date 10-10-55. In the section on camshaft. Note: the use of camshaft 45955 DA (400 tractor series camshaft) replacing the production camshaft will provide increased engine power due to revised valve timing. 45955-DA is the acttual # found on IH cams and is the same as 48196-DA in parts book.
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Today's Featured Article - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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