If the air back feeds through the delivery valve slowly then it is now acting like an orfice. Wouldnt this cause a pressure drop in the air? Shop air starting out at 150 psi then dropping even a little isnt much force on them pistons. I have resealed at least a hundred froozen pumps in the last few years. Very common problem. Maybe 30-40% of all the pumps I see. Most are stuck where a small hammer and punch after soaking are needed to bust them plungers loose. I dont think I would bet much money on the air idea. Sure isnt going to hurt to try. If it did do something it isnt going to help the metering valve at all. Loose plungers with a stuck metering valve is a receipe for a run away engine. I think I will stick to my old school bench repair. Al
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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