LEAKING TOILET BOWLS

A leaking bowl can be caused by one of several problems. Go down this checklist for symptoms and repairs:
* Is the water on the floor caused by moisture condensation(sweating) of the flush tank or, sometimes the toilet bowl?
If so, you can cover the flush tank with a jacket made especially for this purpose. Or you can line the inside of the tank with insulation. You can buy kits of material to install inside the tank. But is less expensive to use sheets of foam rubber or foam plastic and glue them  inside the tank. First, drain the tank(after shutting off the water) then mop the inside of the tank completely dry with a sponge. To adhere the liner, use one of the rubber-based exterior construction adhesives that is compatible with the rigid plastic or foam rubber. These glues are sold in cartridges to fit caulking guns.
* Is the small water-supply pipe to the flush tank leaking either at the shutoff valve or at the botton of the ballcock assembly on the bottom(outside0 of the tank?
If so, try tighting this connection with an adjustable wrench. Be careful; don't apply to much turning pressure with the wrench. If this pipe has to be replaced, consider using a flexible braided water supply line. It doesn't have to be bent as does a solid pipe and its compression fittings don't have to be sealed with teflon tape or joint compound as does solid pipes. Furthermore, once tightened the fittings are virtually leakproof.

* Is the flush tank leaking where it joins the top of the toilet bowl?
There is usually a rubber gasket at this junction. Sometimes pressure on the flush tank from leaning backward against it causes the hold-down bolts and this gasket to loosen and leak. Try tighting the bolts from within the tank. If the rubber washer is the trouble, you will have to remove the flush tank from the toilet bowl to replace it.
* Is the bowl leaking around its botton rim, which sets on the floor?
First, try tighting the bolts that hold the bowl to the floor. You will probably have to remove the porcelain caps that cover the bolts. (Fig6). Just pry them up and off with the tip of a screwdriver.

You must be careful. Caps can be easily damaged. Then with an adjustable wrench or screwdriver, turn down the bolts one or two complete turns,. Give each bolt the same number of turns. * Is the wax ring sealbetween the drain pipe and the toilet bowl leaking?
  If the hold-down Bolts are tight and the leak is still there, chances are the wax ring seal is warn and needs replacement. In most cases, you don't need to remove the tank from the bowl. You do have to remove the tank and bowl from the floor or wall and then replace it again. You must be careful; I recommend that you enlist the aid of a helper.