IH used to sell the change over package with instructions. They said to dull the sharp edges of the oil grove. Ones with the change that I notice just have the upper edge of the grove rounded off a little. If you can find the seal (around a hundred bucks sometime ago) you need the cast or steel retainers and the different length bolts used to mount them. Also they used a different gasket between the retainers, the two small ones. Retainers will have a 271xxxr1 number on them, don't remember the whole number. May have one if you need, would need to look. At one time IH started only furnishing replacement crankshafts like used in the later 400 and 450 engines without the oil return grove. They wanted most engines switched over to the new seal. But now its easier to get parts for the old type.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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