If leaks occur when you flush the tank, the problem is the “Tank to Bowl” Gasket. You may require a smaller or larger gasket to seal the leak. I then tightened the wing nuts to secure the plate. It only leaks down the bolts that connect the reservoir to the bowl. Use a plunger to force out any water that remains in the bowl. Remove the top cover on the toilet’s holding tank and set aside. When I took the cistern off 3 pieces fell off the pan beneath, it was not just cracked but broken and held together with silicon. Flush the toilet to empty all of the water in the toilet’s holding tank. 2. I would pull the assembly away from the toilet and it would leak. More advanced phases of curing a toilet leaking from the base will require moving the toilet itself. I gently moved the assemble as far forward towards the toilet seat as possible and then tightened the knobs. Make sure the tank and bowl are touching the “ridge”. If I did the sequence in reverse and tightened the assembly to the plate, and then the plate to the toilet. Tighten the wing nuts down until the tank and bowl touch. Tighten the wing nuts down until the bowl and tank touch. A leaky toilet tank never feels like a simple problem to deal with. Some toilet models do not have the ridge; instead, they have a rubber support to give the tank some stability. Remove water line from back of toilet. If there is, undo these. Shut off the water at the valve and drain the water from the toilet tank, as indicated above. Use a sponge to absorb the remaining water out of the holding tank. I replaced the guts of my toilet (second one) with standard Fluidm**ster replacement kit. To fix a toilet that has the same problem as above: First turn off water. While a nut cracker would be difficult to apply to a wingnut, much less under a toilet tank, a pair of locking pliers or similar "high force" tool should be able to break (crush) the plastic nut so you can get the rusted bolts out. This is usually located on the bottom left hand side of the toilet’s holding tank. The wingnuts securing the 2 parts are rusted solid. As the water begins filling the toilet’s tank, check for leaks around the new valve. There should be another one on the opposite side of the cistern too. Here is a picture of the actual leaking bolt from the back bottom of the toilet. Remember to place the sponge rubber gasket before placing the tank in the bowl. Toilet tank leaking on the floor after removing and reinserting flush valve. If there is a leak, shut off the water, empty the lines, and unscrew the valve’s compression nut. Related. 1 has broken when I tried to turn it, the other won't loosen and when it does, the bolt moves at the same time as the nut ! Then, see the wing nut next to the water inlet? I've replaced the flange gasket several times. Flush toilet and sponge out water from tank. Whether water is leaking into the bowl or onto the floor, some plumbing work will be required to fix it. toilet - rusted wingnuts I need to separate the cistern from the bowl to replace the doughnut ring. And I can't get it to stop leaking but only when I flush the toilet. I don't get it. 3. It does not leak between the bowl and the reservoir. Remove the 2 or 3 bolts holding toilet … The ridge is about ¼â€ higher porcelain either the tank or bowl surface that the other rests on for stability. Disconnect the toilet supply line from the toilet. Flush the toilet (to remove as much water as possible) then undo these wing nuts, take the lid off the cistern and see if there are a couple of screws holding it back to the wall. 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