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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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