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 - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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