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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Feb 09, 2016 | Air Nailers

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Gun leaks air will not fire


Gasket ok - trigger ok - exhaust seal on top ok?

The Check valve in top cover of nailer is in most cases the problem by this. remove this part and make fully clean if magnesium topcover use steel wool if its not smood and after that use a base silicon lubrication like Dow Corning dc4, OKS 1110 or Silubrin Kluber also this to protect the moving o-rings (because of heat and wear ) by oilless nailers use it but also by nailers with oil lubrication always in the top this valve on top must move easy and freely this part has also a little spring or a special spring element behind so to clean it inside it must allways be removed be carefully. the cilinder should have also a sealing ring that is maybe not tight enough on the top or is broken , remember that if its the first problem after a long time then use a complete service kit to service the nailer, thats better and you learn that the difference in old o-rings and new o-rings you will feel it because the old rings are hard and the new rings are soft in difference, and if kevlar piston is used its a oilless model , but is a normal o-ring there on the driver (piston)also there must be tacker oil pneumolube be used. the base lubrication is not enough for the nailer its going to be to hot on the cilinderrings inside.
But there are also little tackers with a muffler exhaust most behind there can be much close down of dirt.
Or the nailer is fully worn on the body because of a long time used without lubrication.

Nov 09, 2015 | Air Nailers

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

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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

Jun 24, 2014 | Porter Cable Cable No. FR350A Rnd Head...

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...

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

Mar 26, 2011 | Senco Fastening Systems No.43OOO1N SLP20...

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Air nailer vnot operating. blowing air from top close to handle


Your nailer has worn or broken o-rings in the top end. You need a rebuild kit (Senco part number YK0360) to get your gun going again. They are available through most online, after market parts stores. When you get it, remove and replace each seal and o-ring one at a time so you get them all back in their proper place and use all of the grease to lube the o-rings. Use all of the parts in the kit, if one o-ring or seal is damaged the others are not far from failing.

Jan 25, 2011 | Senco FP620 Framepro 602 2" - 3 - 1/2"...

1 Answer

T250S-F16 16 Gauge Straight Finish Air Nailer i have an air leak out of the front of the gun where the driver comes out and makes contact with the nail head (the hole tri-shapped hole) It only leaks after...


Air leaks from the bottom of nailers are due to leaking oring /s that seal cylinder to body of gun and/or leaking thru seal at top of cylinder where headvalve seats. Remove head and examine sealing surfaces of headvalve and top of cylinder. Must be smooth, then pull out cylinder and check oring/s that contact body of gun. Remove any fine scratches on inner body with fine paper (400 grit). Lube with silicone paste. Good Luck!

Sep 26, 2009 | NRS Paslode T250-f16,s200-s16 Nailer &...

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

Nov 30, 2008 | Stanley Bostitch F21PL Nailer

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