I have a K4632-AA which usually works just fine but now it has started to run water every few minutes. What might be the probelm and how can I fix it?

Toilets seem to run on their own because the water in the tank is seeping our past the seal that was designed to keep it in the tank inbetween flushes. Commonly called flappers, they go by seals, tank balls discs. etc. The K4632 requires a flat seal from Kohler. The actual part number is 1059291, however Kohler may only sell this as part of a kit by a different number with pieces not truely needed in your circumstance.

You should contact them at 1-800-4KOHLER, navigate the prompts, and talk to a service member. You may have to do some research in your area to find a retail or wholesale business that will order this for you. There are circumstances where, with some parts, Kohler will send the parts free to your doorstep. No promises on this one. I have put a link below that will give you a complete parts explosion for your reference.

http://www.kohlerserviceparts.kohler.com/ServicePartsPage.aspx?DocumentID=28e40a91273141a5b63e28ad7230d6a5&ModelID=e9143848792b4415a62b4e384caeb856

I had this problem with my Kohler Portrait toilet which was made in the mid 90's. This toilet has been troublesome from the start...needing frequent internal parts replacements but this last time was a doozy.

Water was seeping through the fill tube gasket and was driving me crazy. I tried everything: replaced ALL the internal parts and still happened. Then is dawned on me. The big plastic nut that tightens the fill tube assembly from underneath has to be really tight, otherwise when you reattach the tank to the bowl, the downward pressure on the fill tube gasket will lift it ever so slightly...enough to cause a slow leak. I didnt have the right wrench to tighten this nut (who does??) so I had to use a regular pipe wrench VERY CAREFULLY to tighten the nut without breaking it.

Between the proprietary components and the stupid float on the flapper, this has to be one of the worst engineered and consumer unfriendly toilets you can buy. Forget Kohler. Stick with a basic Mansfield. Easy, simple, cheap.