Friday, January 21, 2011

Rochester Disassembly/Reassembly, Part 6

With the valve resealed I had to turn attention to the pump plunger.

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Nasty.

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A reader sent this trick of using snap ring pliers as a spanner.

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Unscrewed easily.

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Nut, leather pump cup and steel washer in the bottom of the cup.

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You can see that a bit of the leather cup stuck to the brass…

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A new Crosman pump cup will do the job and the height of the cup is similar.

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Drilling.

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Checking depth as I bore out the rubber cone.

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Cutting off the cup.

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Fits fine. I need to make another one with a slightly thinner bottom though as tightening down the nut causes the cup to expand a little too much. With the nut just snug it’s fine.

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Temporarily reassembled for testing. I sealed the tube to the valve body with teflon plumbers tape. It’s been holding air for days now, which is a good thing. I’m going to use an o-ring and some teflon tape for the final seal.

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