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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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