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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 senco.com

Posted on Nov 27, 2008

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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.

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