Question about Porter Cable Tools & Hardware - Others
The oring on the headvalve/piston should be replaced. You can use any oring that fits snugly on the groove. Factory oring is vinyl but use black rubber oring, works just fine. Most likely place to find orings is Lowes in the plumbing department. Select oring smaller than groove so that it will fit snug and should be about 1/8 in thickness. There is a smaller oring behind piston, just make sure it not cracked and check for upper seal in head to be in place. Finally check that surface there oring seals on head is not scratched. Remove fine scratches with #400 grit paper.
Posted on Aug 29, 2010
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Posted on Jan 02, 2017
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sounds like you need to replace the oring around the firing pin piston , or replace the oring or band around the cylinder that the firing pin goes in , it should be the smaller oring that has tiny holes behind it when removed
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