I'll assume they are like the injectors on a 580. If so, there should be a retainer holding the injector in. Remove bolt holding injector in. Injector is not threaded into the head, just a friction fit, I think slightly tapered, with slots on each side of the injector. Take two screwdrivers, one on each side and prize the injectors out. Case makes a special slide hammer tool to get them out, but they are pricey. Might try some penetrating oil.
Why replace the injectors? They are expensive and can usually be rebuilt. Take them to a rebuild shop and have them tested. They may not even need rebuilding, but on one that old they probably do. Rebuilding is not cheap either, but less than replacing.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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