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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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