How to Fix That Leaking Toilet

The main signs of a leaking toilet are water pooling on the floor and a possible smell of sewer gas. The steps you need to take to repair the leak are as follows:

• Shut off the water supply valve and remove the water line that connects to the tank.
• Loosen the bolts around the base of the bowl – if they are corroded, cut them off with a hacksaw.

• Lift the bowl away and set aside. Clean the old caulking and debris off the floor and stuff a rag in the pipe to block sewer gas.
• Look for a possible broken flange, any signs of rot around the flange or a wax ring failure.
• If the flange or wax ring is broken, replace with a new one and if the floor is rotten, install a flange support bracket to transfer the load.
• Reset the toilet by aligning the holes with the bolts and pressing down to seat the wax ring. Do up the nuts and caulk around the base.

Source:http://www.familyhandyman.com/plumbing/toilet-repair/how-to-repair-a-leaking-toilet/view-all#top