The pump has two simple gears inside. The end play of these gears is a very tight tolerance against the cover plate. (as discussed above) The covers warp (they are not cast iron) and leak substantially when they do. Flat sand the cover to take out the warp. use 250 grit on a piece of flat glass, in a circular motion, then as it just gets flat, use 400 grit paper. When putting the cover on, the pump is free to turn. Use a gasket combo (caseIH) that is close to the original gasket. Shim material can be purchased from NAPA or others. You will need .0005" and .001" brass shim stock. Put a small piece of .0005 shim stock (about half a penny in size)between the end of the gear and the cover. As you tighten the cover evenly and carefully, keep moving the shaft a little. If the cover can be tightened pretty tight, you know it has more than .0005" clearance if it still turns. Now use the .001" stock, (take out the .0005) and again tighten slowly and evenly. If it now locks up before the bolts are snug, the clearance is less than .001". Pull the shim out and you can put it together. If it does not get stuck. the gasket is too thick, or too many (they are very thin). If it gets stuck with the .0005" shim it needs to be thicker. I hope this helps. caseih.com has a parts diagram for the gaskets, and look the part number up for a Farmall then select 400, then select engine. JimN
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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