Loosing water from insulated crane toilet tank

The American Standard Cadet 3 flowise one piece toilet uses a flapper valve with a soft nylon washer to seal against the water outlet.
Over time this nylon washer develops 'puckers' causing water to seep between the nylon washer and the seat of the flapper. This seepage causes the water level in the tank to drop to a point where the water inlet valve opens to replace the lost water in the tank.
There are two ways to correct this problem:
1. Replace the soft nylon washer on the flapper, or
2. Replace the entire flapper valve.
Hope this solution helps.

Not familiar with this one, but Korky says they have a replacement flapper that will fit. I haven't seen a topilet that requires tank removal to replace the fill valve.
https://www.amazon.com/Korky-57BP-Fits-Crane-Flapper/dp/B000M2W7WK

You will probably need to change the entire valve. Get a new valve that has a built in float and you can take all those old faulty parts out. Turn the water valve off under the stool, flush the stool once maybe twice to get all the water out of the tank. Have a big towel ready, because when you take the valve loose from the stool you will have a little water escape out the hole. The nut that holds the valve to the tank is under the tank. You will also have to take the supply water line loose from the valve.. You should probably go ahead and change the rubber flapper , which is located in the center of the inside of the tank. A new valve and flapper can be purchased at any hardware store.

You're right it is a bad setup but Crane will not change their design. Most of the time it is from age and you have to replace the flapper system. I would go to the local hardware and buy a FluedMaster setup and change out the flush tube although that means taking the toilet apart.

Check your over flow pipe in the tank to see if you need to lower the water level amount in the tank. If thats not it, it could be the seal thats under your flapper between the tank and base. Simple fix just alittle time consuming

Hi,
The flapper is bad....and allowing water to go through into the bowl very slowly...You need to find the correct flapper for that toilet....even all Mansfield toilets can have different guts inside....then replace the flapper which is very easy to do...

heatman101

Take off the top lid and look at the flush handle mechanism. You'll see a not that holds it onto the tank. Tighten the nut so it is snug. Don't overtighten it or you could crack the tank. Next inspect the chain that goes between the end of the flush handle rod and the flapper valve. It should lift the flapper all the the way up when you operate the handle.

if the toilet is old or not cleaned proper, the water jets that shoot the water into the bowl might be clogged. If the jets are clogged with moldor hard water build up the toilet will not flush proper. If you can take a 3 gallon bucket of water and pour straight into the bowl and it flushes fine you have a water pressure problem as described above. the problem also might be that your water inlet system is not letting in enough water to fill the tank. If this is the problem you need to replace the water inlet mechanisim, such as a fluid master. If you use a blue water device that hangs on the side of the tank in the back of the toilet you might have a peice of it under the flapper that takes the water to the bowl when being flushed. Check under the flapper if you put cleaners in the tank.

adjust the flappers-- either adjust the length of the lift line-from flapper to handle and or the flapper itself not properly mounted on tank seat

Note: Before doing any major work on your toilet, be sure to turn off the water supply to the toilet...

If your toilet's "guts" have an float ball, try unscrewing the ball a little to lengthen the float (which controls the water shut off)

If that does not work, try putting a little bend in the arm that the float connects to get the ball lower into the tank.

If you are referring to the style float that surrounds the fill tube like a doughnut, most likely you have some sort of build up either on the fill tube the float surrounds, or on the float itself - or both - that is causing friction that not allowing the float to travel (and shut off the water fill into the tank

If you are referring to the flapper at the bottom of the tank that allows water to travel from the tank to the bowl, most likely it is has two "arms" that anchor to the flapper to the fill tube. There may be some buildup on these arms that needs to be removed to allow the flapper to open and close easily.
If the flapper is not closing, you may also have a chain that is binding up when the flush handle is pushed. Clean the chain with some CLR, and/or remove any excess links that are piling up when the flapper is closed.