Question about Porter Cable Coil Roofing Nailer

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Changeing coil nailer pressure seals

I blew thew pressure seal on my uncles coil nailer I borrowed.air floods out of the back. id like to fix it rather cheaply can someone plz tell me where to find the part and mabey a guide to change it

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  • Porter Cable Master
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Easy to repair, for parts. Most likely problem/s are the parts within the head/headvalve. Remove four screws and gently pull out the headvalve piston within the head. One seal that contacts the cylinder and the upper bumper inside the headvalve. Push out the upper bumper and inspect for cracks. Order a spare because these parts fail often. No need to change out all the orings. Just clean and lube with white grease. Good luck

Posted on Jul 14, 2013

  • Anonymous Oct 16, 2013

    I've been wondering if roofing in Montreal could be a do it yourself project or if you really should call a repair company?


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Posted on Jan 02, 2017

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SOURCE: Porter Cable FC350A air nailer misfiring

first off I would look at the safety to ensure it is not bent and also the driver is not stuck because of a jammed nail. You can go to and download a diagram for this tool and start some disassembly of the cylinder area to check for other broken parts. I don't at this point think a rebuild kit is necessary unless it has been awhile since it has been serviced and then yes I would but you I think have some other bent or out of place item.

Posted on Oct 30, 2009

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SOURCE: pin nailer shoot only one nail

look at the piston in the cap to see if it is sticking, let me know the model number and I will try and find a breakdown and come up with more suggestions, but this is the place I would start.

Posted on Mar 06, 2010

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I have a Hitachi coil roofing nailer . It is

Usually just an o'ring kit will fix. Take 4 bolts at the top and flip cap over and inspect the stopper. If seal is torn replace that also.

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Several conditions will cause driver not to return to top of cylinder. The driver oring should not be too tight nor too loose. It should take very little effort to push the driver back up. If hard to push back up, replace the oring or lube. Make sure that the driver is not bent and binding in the housing. Finally, there is a check band or oring installed on the lower part or the cylinder. Remove the head and pull out the cylinder. Look for a series of small holes drilled into the cylinder. These small holes should be covered by a snug fitting oring or a band made of rubber. You will usually find the old part within the space. Replace with anything that fits. If the check band was in place and the driver will still not return, most likely air is leaking down thru the nose of the gun past the driver seal. Easy fix, make a seal out of inner tube material and cut hole for driver so that the seal fits snuggly around the driver. This seal will increase the air pressure in the lower part of the gun and push the driver up. Good luck

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Max CN565 main piston is shearing off the new cylinder seal I just installed, causing leak out the back

Cylinder seal for the Max cn565 when installed on the cylinder does not have any overhang into the path of the driver. The seal only comes into contact with headvalve. Seal # cn35041 is hard to find because it is no longer made. If you use a seal from a different gun,be sure seal is about same thickness and no part of the seal is in the path of the driver. The seal should snap into place on cylinder and be difficult to remove. Good luck

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Paslode PowerMaster Plus air nailer, model F350S. Air valve in trigger appears to be stuck open. air blows all the time when air line is attached. I cleaned and blew out all interior components and air...

Part # 097746 valve pin has a rubber surface that seals when under pressure. To replace this part, remove the trigger then two roll pins in the body of the gun just above the trigger valve. Remove the valve and check for debris or faulty part, replacing as needed (verify the the orings on the outer part of trigger valve are not cut, there also should be a spring pushing down on the valve pin ). If the valve pin is worn, also check orings within the gun for wear, including the largest oring around the cylinder seal. Good luck

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1 Answer

I have 3 dewalt roofing nailers with all the same problem, driver drives first nail and then the driver remains down, i changed the driver on one and still does the same can someone suggest a fix tks Gary.

Several things to check. Below the bumper is a small plate that should fit snugly around the driver and keeps air from leaking past the driver. The bumper should not be cracked or missing pieces, replace as needed. On the outside of the cylinder below the cylinder seal, there is a row of holes that should have a snug fitting oring, this is the check seal that causes the driver to return (some nailers have a rubber band covering holes). Finally, the driver oring should allow the driver to move easily down cylinder but not allow the driver to fall under its own weight. Good luck

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My N12 fires a nail and leaks high pressure air for a second or two stops and is then ready to go again. What part do I need?

May just need a good lube with silicone paste oring lubricant (sold at lowes in the plumbing department, used to lube faucet orings). Remove the head and check the cylinder seal for loose fit or cracks and the head for fine scratches where orings make contact (remove scratches with fine sandpaper). If the cylinder seal can spin on the cylinder but the seal looks good then remove the seal and apply RTV sealant to clean surfaces and reinstall waiting for 24 hrs before retest (lube all orings). If the air was leaking from the bottom of the gun, pull out the cylinder and cylinder spacer and clean and lube (remove scratches where orings make contact). Good luck

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1 Answer

Airblowing out bottom of nailer thanks for your help

Air blowing out bottom of nailer indicates problem with cylinder seal and/or cylinder spacer orings. Remove head and check seal at cylinder; if seal is broken or loose, replace with new. If seal is good, pull cylinder and check oring that contacts body of gun and oring between cylinder and spacer. Make sure body of gun is not scratched (sand with 400 grit paper if necessary). Parts are at Good holidays

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I have a Bostitch RN46 Roofing nailer. I bought it used. I first tried it out hooked to a JacPac CO2 system that happened to malfunction at the moment I used it with the roofing nailer. The pressure on the...

The high pressure blew out one or more of your o-rings inside. The drive piston should not move freely in the gun so the o-ring around that is definitely one of them. It's hard to damage the metal and plastic parts of a gun short of dropping one off a roof so rebuilding one by replacing the o-rings is always worth it. You should look for a rebuild kit Part Number: RN46-RK

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You blew out a pressure seal. They aren't hard to replace, and only require a few hand tools to do so.
Parts and a diagram can be found;

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Firing Pin doesn't return

The piston is returned to its firing position by air from the trigger valve after the piston has fired. It relys on the piston sealing against the bumper at the bottom of its stroke, if the bumper was damaged when the driver shattered or it was put in upside down the piston will not return. Also the piston uses air fed into the return chamber from the little holes in the cylinder, if the seal over these holes is damaged the piston may not return. Basically change the bumper and the check seal on the cylinder.

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