Question about Stanley Bostitch F21PL Nailer

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Bostich framing nailer leaks air out driver hole

As soon as I hook my air hose up to my gun the air shoots directly out the driver hole.

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  • krajesj Dec 04, 2008

    I have a Stanlet Bostitch N88WW framing nailer. When I connect the air line to my nailer it cycles like it's firing a nail.

    Bostitch says it's either/both a failed trigger valve or a worn/failed head valve o-ring.

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  • Stanley Master
  • 1,378 Answers

Generally, air leaking from the nose of the gun is caused by the vinyl headvalve/cylinder seal. It is installed on the headvalve and snugs against the cylinder. I would also check the cylinder ring supporting the cylinder that is visable when the head is removed. The cylinder ring is made of white plastic and has an oring on outside edge and seals against the cylinder with another oring. The ring tends to crack allowing air out nose. Some cylinder rings were made of metal, which is better and do not fail. Metal or plastic, check the orings there. Not to worry, these parts are not expensive and available at www.bostitch.com. enjoy

Posted on Nov 30, 2008

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