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
  • 1,388 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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Paslode nailer, driver wont come back the full way


You didnt mention a model number, however, here are some things to check. With nails removed and air hose disconnected, push the driver up manually with rod. The driver should not be hard to push back into place (Like pushing a cup of coffee with finger). If hard to push, check for oring too tight or bent driver. If easy to push and driver moves when you point nose of gun up then down, oring too loose. If driver seems ok, suspect check-band. Most nailers have a check band around the outside of the cylinder. The band could be an oring or a wide piece of rubber. Under the band are a series of holes. These vent holes need to be clean and the band needs to fit snuggly covering the holes. If band is ok, air is leaking down the nose of the gun when the piston is trying to move up the cylinder. Make a seal out of old bike tube or thin rubber to be placed under the bumper. Cut small hole for the driver to pass thru. This seal will prevent too much air from coming out of nose of gun when air is pushing driver up. If air is not escaping thru nose then suspect obstruction in the head area preventing discharge air to quickly exit the gun allowing the piston to reach top. Good luck

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I have a wagner power painter 355E and the directions said to put oil in the 2 holes in the gun. Where are the 2 holes?


Where the raised tips of the tubing goes into the gun,
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My Dewalt framing gun blows compressed air thru the nailer nose? Thx Kurt


Rebuild gun with gasket repair kit.
How it works: Compressed air enters through air hose and fills gun cylinder.
When trigger is pulled, air inside cylinder rushes out and pushes firing pin that shoots nail.

Inside the gun there are gaskets that seal the nose, the trigger and the cylinder head.
When any of those three gaskets fail, then air starts leaking.

Putting a few drops of nail gun oil into gun before connecting hose is supposed to protect gaskets.
But everything wears out, and sometimes folks use 3-in-1 oil instead of gun oil.
3-in-1 is detergent type oil and will cause gaskets to fail.

Another thing is guns that are not used frequently and gaskets get dry.
Putting in a few drops of oil and then immediately shooting gun will cause gasket to fail, because gaskets are still dry.
Best to put in plenty of gun oil, and let oil go down into gun for a few hours before connecting hose and shooting. Even so, nail guns are designed to be used every few days with continual oiling.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on any do-it-yourself project.
Fixya is always less expensive than a service call.

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1 Answer

Nail gun doesn't shoot and air blowing out vent constant.


We used nail guns for years. I still own 6 guns, but they aren't used much anymore.
You have a 'blown head gasket.'
Or there is debris from the air hose that got lodged into the gun.
There is a head gasket and a trigger gasket.
Both can blow out any time from use, lack of oil, or they can stick open from debris.
You can take apart the head and clean it up and add oil to see if that solves problem.
You can order a gun re-build kit for your model and put in the parts yourself.
You can have a nail gun repair shop do the job.

Nail guns require gun oil.
If you don't use gun for a while, oil should be put into air hose opening and then left to run down into gun. More oil is better.
If you use 3-in-1 oil or some oil besides gun oil, then it will corrode the gaskets.
When storing air hose and guns, put tape over openings so they stay clean.
Before hooking air hose to a gun, you can also put a blower on hose and blow out the line first

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2 Answers

Nail gun will not shoot and air is exhausting out top vent all the time.


We used nail guns for years. I still own 6 guns, but they aren't used much anymore.
You have a 'blown head gasket.'
Or there is debris from the air hose that got lodged into the gun.
There is a head gasket and a trigger gasket.
Both can blow out any time from use, lack of oil, or they can stick open from debris.
You can take apart the head and clean it up and add oil to see if that solves problem.
You can order a gun re-build kit for your model and put in the parts yourself.
You can have a nail gun repair shop do the job.

Nail guns require gun oil.
If you don't use gun for a while, oil should be put into air hose opening and then left to run down into gun. More oil is better.
If you use 3-in-1 oil or some oil besides gun oil, then it will corrode the gaskets.
When storing air hose and guns, put tape over openings so they stay clean.
Before hooking air hose to a gun, you can also put a blower on hose and blow out the line first

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1 Answer

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The o-rings need to be replaced and/or the trigger assembly is defective. Look around at local lumber yards for a "Bostich days" promotion. Often with the purchase of a box of nails, the Bostich rep will "service" up to 2 guns for free. If this is not an option for you because of time, you can purchase the o-ring kit and replace the rings yourself. This is not a difficult repair. Also, be sure to lubricate the guns with pneumatic oil frequently as this will keep the rings lubtricated and prevent them from drying out and leaking.

Hope this helps,

Dan

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