IH sold several size pulleys for M tractors depending what was being run from the belt. Belt drives and pulleys were considered a attachment, so I don't yhink any one size was considered standard. Common was the 11 x 7.5 and a 12 x 8.5 and 13 x 8.5 were sold. The only advantage with iron was holding up better if left out in the weather. Fiber, paper pulleys griped belts better. IH was getting fiber pulleys for M size tractors until in 1951 or 52 when something happened to the supply. Think the company went out of buisness or quit making pulleys. IH then went to selling the iron ones for the next few years. Don't know if IH considered the iron ones less effective or they cost more, but for some reason IH considered the iron ones to be sold for emergency use on H, M size tractors when fiber pulleys were not available.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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