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Flush Tank Maintenance and Repairs Tank continues to run after tank fills
The problem is the water inlet valve is not seating tight enough to shut the water off. To isolate the problem, remove the tank lid. Grab the float and lift: a. If the water stops running the problem is in the float mechanism. If the float is over half submerged look for a leak in the float. Check the float and repair or replace. If the float is okay, adjust the float downward. This can be done by: a adjustment screw on top of the ball cock. b. bending the rod supporting the float. The recommended water level is often marked on the tank wall. If not, the water level should be about 1" below the overflow pipe. If you cannot stop the water flow by raising the float, the problem is probably the inlet valve in the ball cock.
Water on the floor underneath the toilet tank may be caused by one of the following: Condensation on the outside of the tank due to cold temperature of the water. This will almost always happen in the summer, when the temperature and humidity are high. In the winter it will not occur.
The water leaking from this source will usually be in a puddle under the end of the tank where the water pipe connects to the tank. Look under the tank and see if there is an accumulation of salts around the pipe. Often times a one quarter or one half turn on the nut next to bottom of the tank or on either side of the shut-off valve (if there is one) will stop the leak. If tightening the nut does not stop the leak it is probably the gasket at the bottom of the "ball cock" where it goes through the tank. To do this, disconnect the water pipe to the ball cock after dipping out water. Loosen the big retainer nut under the tank and remove the "ball cock" assemble. Replace the rubber gasket and reassemble the unit. The refill tube may be misdirected so it directs the water against the top or side of the overflow pipe causing it to splash against the top of the tank and running down the outside of the tank. If this happens when you take the top off, readjust to direct water down the filler tube. The packing or "O" ring on the inlet valve may be worn so when the toilet is flushed and the valve is opened the water squirts out the top of the "ball cock" against the tank top and runs down the outside of the tank. The procedure for replacing this packing is the same as for replacing the valve seat. Procedure when tank partly empties: Sometimes when you pull the flush lever the tank partly empties or the handle must be held down to completely flush the toilet. Check to see if the mechanism or chain connected to the rubber tank ball is free and not kinked. If so, adjust the length so the rubber tank ball is lifted higher when the flush valve is released. This will allow more time for water to enter the stool. Procedure if nothing happens when flush handle is pushed After many years of use the linkage between the handle and the float wears out and becomes disconnected. Remove the tank top and find out which part is worn out. Replace it with a new part which can be purchased at most stores selling plumbing supplies. Temporary repairs can be made with a wire or cord if a new part cannot be obtained for several days. Procedure if there is no water pressure: When the water pressure is gone the flush tank will not fill for the next flush. All that is needed to flush the tank is a big rush of water in the stool so a pail of water dumped into the stool will flush it. Then part of a pail of water must be poured in for the next use. Installing A Ball Cock When installing a new ball cock, make sure it is an anti-syphon ball cock to meet code requirements. This type of ball cock guards against contamination of the fresh water supply. New types of ball cocks: Diaphragm ball cock
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