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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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