Bostitch air nailer leaks air out the back

Most likely problem is the head valve orings not making perfect seal. Remove the head and pull out the headvalve piston. Apply plenty of white grease to orings and test fire. If gun fires, will need oring kit soon. Good luck

Most likely the orings or seals in the headvalve are not making perfect seal. Remove the head and pull out the headvalve. Apply plenty of white grease to orings and test again. If the gun fires, then will need oring kit soon, or just keep using plenty of grease. If the gun still does not fire, check that the safety foot is depressing the trigger valve all the way in. Good luck

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

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

I would take it back for warranty repair if it is that new. If not I have detailed instructions on how to remove the trigger valve assembly from the tool. If it is leaking air it is probably a split o ring on the valve.

I would suggest checking the cylinder seal and the firing valve for the problem. Also when you take the cap back off check for cut o rings in the cap assembly.

Can you verify the model number please? I only see references to N64 or N66 for coil nailers.

Specific to the problem listed, this is usually caused by an air leak through the O-rings. I would replace the O-rings and make sure that the entire area is well lubricated with pneumatic gun oil and try again. This should resolve the problem.

Dan

could be the firing valve is sutck or has a pinched o ring or the cylinder seal is extremely loose or pitted.

sounds like the rubber seals have dry rotted prob from not oiling it enough, but you should be able to go on the Bostitch web site and order new rubber seals for the gun