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SENCO SN-IV LB3500 Seal leaks air

This gun has a seal at the bottom of the piston which is about 2 1'' in diameter. the old seal was wax and was probably installed by heating it. the new seal is nylon. since this seal must pass over a lip that exceeds its diameter, do I heat this ''nylon'' seal or do I physically
stretch it to install it.

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The old seal was origionally the same as the new one, a white nylon, however over time the seal breaks down and looks like hard wax. The new seal may be installed by heating with hot air gun till plyable and gently streach over lip. While the gun is open, lube with nail gun oil. the piston should not slide down the cylinder under its own weight, if it does, replace the piston oring. Diagram available at

Posted on Nov 27, 2008

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How to fix a new toilet flange so it will not leaked down onto the drain pipe

Hi Connie.

Hoping I'm visualizing this properly. The stand pipe under the house is generally pointing upward and has a flange on it. The toilet will have an indent on the bottom that is somewhat larger that the flange diameter. Then there will be a wax ring that is seated around the neck of the flange right before the toilet is placed down on top of it. The general process is that a new wax ring is placed, the toilet is lifted and, as carefully as possible, lowered straight down over the floor bolts. Once it makes contact on the floor, the toilet is gently rotated a small bit clockwise and counterclockwise to make sure that there is a good solid contact with the wax. The toilet is set square to the wall and, hopefully, with the floor bolts centered on the slots. Someone sits down carefully on the toilet to put pressure on the wax and seal it (this should not be done on a cold day, as the wax may not flow, and may even crack and leave a gap).

From what I saw you write, my questions would be whether the wax gasket was installed. if not, pull the toilet, obtain a gasket, and try again. if one was installed, were the remains of the old gasket thoroughly cleaned away from flange and toilet bottom? if not, the old wax may have cause uneven flow/sealing with the new ring (too much wax in the space).

You can also check that the leak isn't coming from higher up, like at the join from bowl to tank. If it's leaking there, depending on your toilet model, it might leak once the flapper is lifted in the tank, flow down the back outside of the toilet, and down under the house. In that case, it could be a bad seal, or the tank-to-toilet bolts not having been tightened.

Hoping this gives you some ideas


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My Turbonator doesn't want to fit all the way into m intake hose like it's supposed to !

It is probable there is a diameter issue here - either the Tnator is too large or the hose is too stiff or dry. Using a SMALL amount of clean motor oil on the Tnator before assembly should help in the installation. If it does not, you may be able to use a heat gun or blow dryer to heat up the hose for the Tnator to fit.
If using heat gun, use it on low and be careful not to burn the hose. Don't heat the Tnator - just the hose. If that works, fine. If not, you may need to go with a larger intake tube ( hose).
Don't force the Tnator in too hard - You may disable it from working or worse yet break it. I recommend measuring the inside diameter of the hose and outside diameter of the Tnator. The Tnator should not be more than 3 thousandths of an inch larger ( .003 ).
If it is bigger, then you probably got a misboxed item and need to return it for the right one.
Hope this helps!!

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F28WW-fire gun. piston doesn't retract back, trigger is good gun is clean & oiled what could be the problem. nailer year old

Check band # 175520 (black rubber band around the outside of the cylinder) is what causes the piston to retract. If the check band is in place, then problem could be caused by cracked lower bumper, worn piston oring or cylinder seal on the headvalve. IF the cylinder seal is bad, air will leak between seal and the top of the cylinder and could push piston down cylinder. If piston oring is too loose, the piston will not stay at the top of the cylinder. If you point the nose of the gun up then down again and the driver moves within the cylinder, replace the oring. Good luck

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Need a cylinder seal 41209 central penumatic nail gun

I have used seals from Bostitch framing guns, however you must experiment. Bostitch seal number T60006 has inside diameter (lip of seal) of 1.875" and seal # N70155 measures slightly over 2". The lip should be about even with the bore of cylinder so that the piston will not push it off. If the seal fits a bit loose, you can apply RTV to inside and push on the seal and install the head. The head valve will center the seal while the RTV firms up. Wait 24 hours or longer before use. Small seal will usually not work; will split or fall off inside gun. Finally, I have made seals using hard roller blade wheel on my small lathe. Roller blace wheels are made of material that will work in oil and is about shore 95a hardness. Good luck.

Nov 06, 2012 | Tools & Hardware - Others

1 Answer

When i squeeze the trigger the gun goes off but no nail comes out? i have already bought the repair kit and have been working on this gun all day

Here are a few tests for you to try. You will need a piece of rubber or coiled up old hose.
First open side door and remove nails. Tilt gun head down then up again to check if piston is loose in the cylinder. The piston should stay in top position. If piston drops to bottom of cylinder replace piston oring or apply some coils of teflon tape under oring to expand oring slightly untill piston stays at top but still can be pushed down cylinder. If piston stays at top connect air to gun and with side door open contact gun to rubber firing gun noticing the feeder movement. With very rapid firing of the gun, the feeder should move back and fourth just as fast as the driver moves. If the feeder seems to move slower than the driver moves then check/replace spring in feeder. If spring seems strong enough in your opinion then problem is restriction in the air supply to feeder. You will need to remove the two 6m allen screws at front of gun and split gun apart to check restriction at the oring sealing these two parts. Sometimes debris traped at oring (white oring) will restrict air to feeder. Good luck.

Jan 08, 2011 | Stanley Factory Reconditioned Bostitch...

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Its all orings you can get them at a hardware store Take the screws out of the back pull the pistion out and replace them all You should always put light oil in the air fitting on the gun before you use it compressers make condencation and water will dry the seals out if not used often I have the same gun

Nov 24, 2010 | Porter Cable-Cable FN250C 1-inch...

1 Answer

When i plug the air line into the gun hitachi nv75 coil gun . the gun does not even shoot a nail. i replaced all the rubber seals in the gun and the 2 little ones in the plastic coil basket

You did not described if there is piston movement when you squeeze the trigger or push outlet into the material. If there is piston movement but it is too weak to push the nail, insufficient air supply is first obvious reason.

Eliminate insufficient air pressure or volume supplied to the piece. Air pressure supplied should be between 70psi to 120psi (4.9bar to 8.3bar), air hose should be at least 7mm internal diameter.

If air supply was eliminated, disconnect air supply and check if piston is not locket in one position, you described that you done some maintenance on the machine. I assume therefore that you will know how to check piston for movement, if there is some restrain, you need to find what is causing it and remove obstruction.

As you put gun together, do not forget to lightly oil all assembly surfaces with compressor oil.

This is very good gun and should serve you for many years to come, we use these for last about 8 years rather haevily without any problem (except aprentices...), hope you will have as good service from yours.

Please send note what was the reason, and how did you solved it.

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What the question? There are no seals or piston in a Blw Gun.

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How do i replace the front caliper seal on 06 malibu maxx??????

while the seals in the calipers are replaceable, its probably easier just to get a new/re manufactured caliper. if for any reason the seals don't work perfectly you could lose control of the vehicle when attempting to stop. with that said i'll try to explain the best i can how to replace the seals in the calipers for that vehicle.

1. jack up the front of the vehicle, place on jackstands and remove the front wheels, make sure the parking brake is on
2. unbolt the caliper and unbolt the brake line from the caliper and take caliper to a clean bench
3. remove the dust boot retaining ring on the caliper that holds the boot to the caliper itself
4. using a blowgun with a rubber tip apply low pressure compressed air where the brake line was bolted to the caliper to push the piston out of the bore (be carefull and ready because the piston may shoot out with some force)
5. when the piston comes out you will need to replace the dust boot and the seal so remove the boot and seal carefully so you don't scratch the piston ( the seal is actually in the caliper piston bore hole)and throw out the old seal and boot.
6. inspect all the surfaces and make sure there are no imperfections at all on the piston, the piston bore, or the caliper, if the surfaces are marred in anyway, replace the caliper, if they are good, using brake cleen and compressed air clean all parts then dry them
7. get the new seal and lubricate with DOT 3 brake fluid
8. install new seal into the caliper bore
9. apply a thin coat of DOT 3 brake fluid to the piston itself
10. install bottom half the the caliper piston into the caliper bore.
11. install new dust boot seal onto the piston
12. compress the piston to the bottom of the caliper bore
13. fully seat the dust boot seal into the caliper and install retaining ring
14. reinstall on vehicle (make sure to use a NEW copper washer on the brake line to caliper fitting) and bleed the braking system while checking for leaks.

repeat process for the other side.

if the caliper leaks at all from the piston after seal replacement, replace the caliper.

make sure you properly bleed the brakes before attempting to drive your car.

*these direction were extracted from personal experience and manufacturer information*

any other questions just ask!

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1. Insert your wax stick into a standard sized glue gun. The fit may be tight. The more wax you use, the smoother the fit. 2. Use a second wax stick in the gun to help advance the first, if needed. 3. Heat the gun up to temperature. 4. Do a few test pulls on the gun to get a feel for the quantity of wax you would like to use with your seal. (Two good pulls of the trigger will produce a full seal for the larger sealing coins.) 5. Wait for 10-15 seconds, then press your seal firmly into the wax before it hardens. 6. Lift the seal slowly off the wax. If it comes away and the wax is still quite soft, wait a little longer before pressing the seal down.

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