Question about Stanley Bostitch N88rh Framing Nailer Driver Piston 158582

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Not firing leaking air out top

Coil type framing gun

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This will be one of 2 problems either the four bolts that connect the back plate are not tight enough (if the air is coming out of the seal) or if you open the back plate and look in the back you will see a sort of plastic diaphram in this is a spring that will have snapped i know because im online now looking for a spring for 2 of mine at the moment

Posted on Jul 07, 2009

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Posted on Jan 02, 2017

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1 Answer

Nailer wont advance the nails then it shoots blank


Try ez test to check for proper operation. Remove nails and air supply, point nose of gun up then down again. The driver should not move from the top of cylinder position. If driver is moving up then down replace the driver oring. If driver oring seems ok then connect air supply and bump fire the nailer without nails against soft wood and door open so that you can see the driver and feeder moving. Bump fire the gun and make sure that the driver is moving all the way back up to top of cylinder and the feeder is moving rapidly back and forward. If movement seems ok then hold the nose down on soft wood and depress and hold the trigger. This will fire the gun but driver will stay at the bottom position and not return until you release the trigger or lift the gun. When holding the gun with the driver down position, no air should leak out the top or bottom of the gun. If air leaks out bottom, replace lower bumper, if air leaks out the top replace the upper bumper. Good luck

Mar 19, 2015 | Porter Cable Coil Roofing Nailer

1 Answer

I have a Bostitch N80S stick framing nailer that leaks air from the trigger area. I replaced the entire trigger valve with a new single fire trigger to see if the old bump fire trigger was the problem


Remove the nails and take off the trigger to expose the trigger valve (usually part # tva6). Connect air and spray soapy water on the valve to determine if the air is leaking from the center of the valve or around the outer edge between the body and valve. If leaking from the center, could be defective valve or debris under oring. Pop out the valve and examine internal parts for cut oring or defect. If leaking from between body, you could have cut orings installing the valve. Make sure that there are no rough edges in the body of the gun. Bump fire or single fire happens with the trigger type not the valve. Bump fire trigger is usually black metal and single fire trigger is light color plastic. Good luck

Apr 10, 2013 | Stanley Bostitch Nail Gun

1 Answer

Nailer drives nails too deep


n80 coil nailer is a very powerful nailer used for hard wood. If the driver is setting nails too deep, adjust safety foot to the lowest level. Install safety foot no-mar boot to lift the gun even higher. If still too deep, most likely the lower bumper inside the gun is worn-out or cracked. Easy test. Remove nails and connect air supply. With trigger depressed, push and hold the gun against work (I use an old rubber hose tightly coiled up). This will fire the gun but keep the driver down allowing you to examine the tip of the driver. The driver should extend out past the nose less than quarter inch. If the driver is extending too far, most likely bumper is worn out. If a large quantity of air is leaking out the nose of gun during the test, indication that lower bumper is cracked. Good luck.

Apr 06, 2013 | Stanley Bostitch N80CB Coil Framing Nailer

1 Answer

I put a new o ring rebuild kit in my Bostitch N80 sb framing nailer. I replaced every o-ring (including the trigger valve assembly


If the new trigger valve leaks air when you connect the air supply, most likely defective valve or air is leaking past outer trigger valve orings due to debris in the slot or new orings were cut when the valve was pushed in. If air leaks when you depress safety to fire gun then most likely problem is in the head valve or safety foot is not pushing the firing pin all the way in. Easy test, remove nails and remove the trigger to expose the firing pin. Connect air and very quickly depress the firing pin all the way in. If the gun fires, adjust the safety foot as needed. If the gun does not fire, remove the head and check headvalve orings for good snug fit against the cylinder within the head. The surface were orings make contact must be very smooth and not too deeply worn. If you notice fine scratches remove with fine sandpaper. Reinstall head using plenty of white grease on all the orings within the head and retest. Good luck

Feb 10, 2013 | Stanley Bostitch N80CB Coil Framing Nailer

1 Answer

I have a magnum air 33degree gun, i removed the head cap to replace blown gasket, when i put it back on the gun will not fire.


Check the alignment of the of the gasket in reference to the small hole on the sealing edge(gasket has four bolt holes and one vent hole). This small hole allows air to vent from the upper part of the head when you depress the trigger casuing the gun to fire. If the gasket seals the hole or if air is leaking past the orings in the head vale the gun will not fire. If you hear air leaking from trigger when you attempt to fire the gun, most likely orings are not sealing. Remove the headvalve and lube the orings. If no air leaks from trigger when your attempt to fire, vent hole blocked. Good luck with your repair.

Aug 27, 2012 | Magnum Air 8 10 Gauge Framing Nailer

1 Answer

I have a Spotnails Framing Nailer MNS-5 and need a manual or a list of nail types i can use.


The nails for these guns are no longer produced by Spotnails. I am a Spotnails dealer and you can have them made by special order but the cost is not worth it. Buy a modern gun that uses something more common like the Paslode/Senco style 34 degree clipped head nails or a coil nailer. The MNS5 was a good tool but used an odd nail (I believe it is 15-17 degree without looking it up) and the tool has long been obsolete. It's too bad as I still have some parts and guns.

Jul 29, 2012 | Spotnails Mns Framing Nailer Oring Repair...

1 Answer

Coil nailer wont feed nails, fires no problem


Remove nails from the gun and dry fire the gun by bumping it against thick rubber mat or coiled up rubber hose. As the gun cycles notice the feeder moving back then forward in time with the cycle. Make sure that the feeder is connected to feeder driver with a roll pin and that the check feeder is in place in the latch door. The check feeder is thin metal and should have spring action. The driver should return completely to top of cylinder with some degree of force. There should not be much air leaking out the nose as the gun cycles. If a quantity of air is leaking out nose with each cycle, then lower bumper may have broken/cracked. Replace as needed. If very little air is leaking out nose with each cycle then driver could be bent, piston oring could be worn or lack of lubrication in cylinder. If all lower parts seem good, then only area left to check is head valve. There is a 1/4 inch dia. rubber ring at the very top of head that could restrict air flow out of exhaust port. Adjust as needed. Good luck.

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