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Old 12-05-2012, 09:31 AM   #1 (permalink)
ironnerd88
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Join Date: Apr 2006
Location: Atlanta, GA

Cup Seal break-in

My old nelson pump has a leak down the barrel, I know it's the cup seal. Mine is new, one of the nicer units made from brass and having a plastic insert on the sealing surface. It's the first new seal I have added in about 15 years on this gun, so I may have forgotten a step somewhere.

Anybody have an idea on how long it takes to wear onna these things in? Or is there a method for "lapping" the seal into shape quickly?

It's a pretty minor leak, but is still annoying.
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