HOW DO I CHANGE FLUSH SEAL ON KOHLER ONE PEICE TOILET

KOHLER Touchless Toilet Flush Kit 1954 0 The Home Depot


It might be better to replace flush mech. The Price is about $40.00

Replace the flapper even t looks good the loose the ability to seal

Take a close look at the Geberit TM seal...mine had air bubbles in it that prevented a flush seal...and heance a slow leak that caused it to fill-up many times a day and night...see my issue here: https://pierrebridge.wixsite.com/fixit.

There is a rubber seal at the bottom of the flush valve that covers the openning at the bottom of the tank. If this rubber seal has perished slightly then it will leak water into the toilet bowl. This rubber seal need to be replaced to form a proper seal to prevent water leak.

The Kohler Cimarron is one of the most popular and reliable toilets out there. (My Favorite). However, depending on the hardness of the water and if you use cleaner tabs in the tank, these factors can lead to a malfunction.
The first thing you should do is hold the flapper (rubber seal inside the tank that releases the water down to the bowl) down with your hands for a few seconds after a flush and see if the toilet stops running. Sometimes the flapper doesn't seal properly therefore the fill valve keeps working non stop. Stopping the fill while holding the flapper down will confirm that your flapper needs to be changed.
If this doesn't work then try this....
The other common problem with a running toilet is with the fill valve itself. There is an attached float on the fill valve that goes up and down depending on the water level. Once the water level rises, it rises the float, and the float tells the fill valve to stop filling the tank. While the toilet is running (hissing), try raising the float all the way up with your hand and see if it stops. If it stops but not consistently with every attempt, then you will need to change the fill valve. I believe the Fluidmaster 400A is the replacement model.

look under the tank, their should be a nut holding on the old one. by removing that nut the part should free itself.

That is a tricky one. Tighten the tabs, twist into place, then tighten a bit more. They are a pain in the a$$, but with patience you will get it done. Good luck

check handle to ensure no tension is on the flapper chain when not being flushed. check flapper to ensure positive seal to flush valve. check water level to ensure not overflowing into flow valve. if that's the case, lower water height.

then if still doesn't work, change flapper,

all else fails, change flush valve.
good luck,
steve

These models need to have a flush valve flapper that has a styrofoam float on the lift chaninof the flapper. Go to hardware store or home improvement store and get a 'Korky brand toilet tank flapper with float 'ball". Cut the rubber ring piece away from the flapper and you don't need it (see cut here marks on flapper). Install flapper and adjust the float fairly close to the flapper.
When the water level drops in the tank and reaches the level of the float on the opne flapper, the flapper quickly closes causing the toilet to have a "surge" of siphon action which forces the water in the bowl to be drawn out.