You will need to turn your water off and disconnect the supply line. Then loosen the bolts that hold the tank to the bowl, remove the tank to bowl seal and remove the flange nut on the bottom side of the tank which holds the flush valve in place. Next purchase a replacement valve assembly from your hardware store, but be sure that the new assembly has an overflow tube at least as tall as the old one. If the new one is taller, then note the correct height from the old one, mark that height on the new one and, using a hack saw, cut it to the proper length. Using new seal, reassemble in the reverse order as used in removing the old valve.
Do you hear your toilet running at night?
Many toilets really do run only at night. The reason is because people use much less water during these hours and in many municipal water systems, the water pressure rises considerably during this time.
It is not uncommon for system water pressure to rise by 15 to 20 pounds per square inch. This rise in pressure could cause “water creep” inside your gravity fed tank by 1/2 inch or more. That is why the manufacturers of toilets normally suggest that the water level to be set at approximately one inch below the top of the overflow tube.
It could be your water level.
If you only notice your toilet running in the middle of the night, there is a good chance that the water level in your tank is set too high. Remove your tank lid and check out the water level. If you are doing this in the middle of the night (which is the best time to check) and the water is running over the top of the overflow tube, adjust it down using the adjusting screw on the top of the fill valve mechanism (turn clockwise) or the “V” shaped clip on the stiff wire link (slide it down) on the “sliding float” so it’s not overflowing. Then, the following day, make another adjustment down to the one-inch level.
If all of this sounds too complicated, just visit the HELP website!
(Flickr Photo By Mai Le)