Question about Stanley Bostitch N86S 1 Factory Reconditioned Angle Nailer

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Air leaks from top of nailer

Found broken plastic o ring or dough nut

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Is this broken o ring about the size of the cylinder? If so that would probably be your air leak. You can go to Stanleybostitch.com and look at a breakdown and also order parts. If youu give me the model number I will help you with numbers. While you are at it how is the piston o ring, does the piston stay where you move it to or fall down without any pressure. If it does you might want to think about all new o rings for the tool. Let me know

Posted on Jan 17, 2009

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LOOKING FOR SEAL REPALCEMENT AT TOP OF PISTON


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1 Answer

I have a bostitch rn46 roofing nailer leaking air out exhaust port on top put all new o rings and head valve still same problem


Leak out the head vent is usually caused by fine scratches on head valve (white plastic part in the head) and wear/ scratches on the surface where large oring of the headvalve makes contact with aluminum. Use fine sandpaper to remove scratches on aluminum head and replace the headvalve (white plastic part in the head). If the head has deep wear groove, replace head or sand and use oversize oring (or use Teflon tape under oring). Good luck

Jun 23, 2015 | Air Tools & Compressors

1 Answer

My FR350A failed and started leaking air out the deflector continuously. I took gun apart and found a clear ring broken in the cylinder. After examining all parts I concluded that the broken item is the...


Edge with slots goes against the cylinder and the smooth top edge of the seal goes against the headvalve. Remove the headvalve and lube with white grease. You can save some money by using Ridgid seal #07902001013. Same part less money. Good luck

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1 Answer

Dewalt D51850 framing nailer leaks air continuously


You could have broken internal parts but more likely you have broken or worn o-rings inside the nailer. You can go to the Dewalt service site at, http://servicenet.dewalt.com/, search for your model number and get a good breakdown of the nailer and order the parts you need to rebuild it. If you replace any o-rings, replace all of them.

May 25, 2012 | Dewalt D51850 Heavy Duty 20 Degree Full...

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The nail gun began leaking air from the nailer end so I dismantled it and found that the o-ring on the piston was broken so I ordered a new one and replaced it. However, once I put it all back together ,...


Piston oring will not cause gun to leak. Most likely the orings between the cylinder and cylinder spacer and orings sealing the cylinder spacer to the body. The cylinder spacer is the white plastic piece visable when you pull off the head. Order the oring kit and replace all the orings in the lower part of the gun. Dewalt used some vinyl orings on the cylinder that failed. The trigger also has orings that will fail. Good idea to order a trigger valve and have it ready( or replace now if the gun is several years old). Good luck and post again if you have question about this gun.

Sep 19, 2011 | Dewalt Round Head Framing Nailer D51845

1 Answer

SLP 20 Leaks air from top and I Just replaced the chamber and o Rings.


The slp20 uses a firing valve part # ba0119 black plastic w/rubber boots. This valve is what prevents air from leaking thru top of gun. If pin hole has developed, or oring # lb0012 is not in place under the firing valve or if the retainer # bf0149 does not fit snugly on cylinder or has cracks, the gun will leak. Assuming oring is in place and retainer is good, suspect firing valve. Good luck

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1 Answer

Porta Nailer Air leak ( gasket ? ) compression chamber


More likely an O-ring. When they spring a leak, you buy a kit that contains all the gaskets and O-rings and replace them all. An easy job. Hope this helps.

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1 Answer

Paslode t250 f16 leaks air from the cap difuser


The most common problem with this nailer is the plastic seal that sits on top of the cylinder. This seal (ususlly white, yellow or black in color ) will cause the nailer to leak lots of air out top of gun. Examine seal for cracks and replace as necessary; the part number is 402725 and is available at www.toolpartsdirect.com This should stop the rapid air leak. After installing the new seal, if you have a very small constant leak out top of the gun then remove the screw holding the headvalve in place and check for small scratches where the orings contact headvalve. Use very fine sandpaper (300 to 400 grit) to remove scratches. Clean and re-use the same orings using silicone grease instead of oil and re-assemble. This should stop all leaks. Silicone grease is available at Lowes lumber in the plumbing department. It is used to lube orings in faucets. If you have more questions about this gun please email, Good Luck

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1 Answer

Bostich framing nailer leaks air out driver hole


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

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1 Answer

Air allways and continually leaks forcably from the top. Bostitch


This nailgun has several parts to the headvalve that must fit together properly to seal. Go to WWW.toolpartsdirect.com for a diagram of this tool. The part called the diaphragm is source of problem. It has thin vinyl walls that will fold over when you assemble. The piston will not cause the gun to leak, just make sure that piston fits snug into the cylinder. Loose oring on piston will only cause low power or the poston may not retract all the way back up. Some piston/drivers had a plastic ring instead of an oring. The plastic ring had a secondary oring under, however not necessary. You can use rubber or plastic, just make sure that the piston is not too tight or too loose. The piston oring is the only oring in the gun that can be cut to fit. It is like a piston in a car engine. The piston rings have a gap.

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