Kohler One Piece Toilet Troubleshooting & Repair Guide

Kohler one piece toilets came into fashion in the late 1970s and became wildly popular in high end homes as designer showpieces in the 1980s. Kohler One Piece Toilet Troubleshooting Kohler One Piece Toilet Troubleshooting & Repair GuideIf you have a higher end home built around the 1980s, chances are high that you have Kohler one piece toilets installed in your home. Kohler model designs that use the one piece style are the Kohler Rialto, the Kohler San Raphael (san rafael), the Kohler Santa Rosa, the Kohler Gabrielle, and others.

Kohler One Piece Toilet Repair Parts.

Unlike many toilet models, Kohler one piece toilet DO NOT have universal parts that you can just pick up any where. Youll have to order these parts from a specialty supply store, or shop online. And be prepared for a sticker shock, as these parts run between $100 ro $200 retail!!! Also, these toilets are among the most difficult to repair of all the common toilet brands, so if you are not prepared to spend $100 to $200 and spend all day getting parts and tinkering around in the back of your toilet, just stop reading right now and go shopping online for a brand new toilet! It will save you a lot of money and headache.

If you are quite a handy person, and you dont mind tracking down the parts, and tinkering in the back of your toilet all day, then read on

Kohler One Piece Toilet Kohler One Piece Toilet Troubleshooting & Repair Guide
First of all let us go over the most common problems associated with these toilets using a diagnostic chart:

This Kohler one piece toilet diagnostic chart

has a list of all the most common toilet problems in the left column. Directly to the right of the problem, the second column has the corresponding solutions, with a link to the article if there is one.
The key to a good toilet repair is finding out exactly what is going wrong first. Otherwise you can spend a lot of time and money buying and replacing parts that arent even the source of the problem! Using this chart allows you to quickly and expertly troubleshoot your toilet problem and find the right solution.
Toilet problem
Solution
Toilet runs intermittently, filling the tank without anyone using it. After filling, the toilet bowl still has ripples in it from water leaking out of the tank.
Replace the flapper.
Replace the flush valve.
Toilet runs constantly and will not shut off.
Replace the fill valve.
Toilet wont flush unless the handle is held down.
Adjust the flapper chain.
Toilet wont flush at all, the handle just flops around.
Replace the handle.
Toilet leaks on the floor from the supply line.
Replace the supply line.
Toilet leaks from the shutoff valve handle.
Replace the shutoff valve.
Toilet is loose, wobbles, has an odor, or leaks at the base.
Reset the toilet.
Repair the closet flange.

I linked the articles containing the solutions to the universal parts and functions of your Kohler one peice toilet. The two areas that I did not link are the fill valve, and the flush valve / flapper. These are the unique, specialty repair parts that cost a fortune. As stated above these parts will likely have to be special ordered for a decent sized sum of money. The Kohler one piece fill valve has a float ball and lever, a smal black float cup and a large, clear, plastic tube that inserts into the porcelain of the toilet tank. The Kohler one piece flush valve has a rubber seal underneath, three small brass screws and tabs that insert into the flush valve and hold in place, and a large red flapper. (see picture.)
Kohler One Piece Toilet Troubleshooting & Repair Guide

The fill valve is fairly simple, assemble it, insert the plastic tube, and adjust the float ball to get just the right amount of water in the tank.

To install the flush valve, insert the rubber seal, and push it down over the flush hole in the porcelain. While holding pressure down, swivel the brass tabs to lock the flush valve into place, and screw the brass screws down to tighten the tabs down. Be very careful not to loose the screws or tabs down the flush port! This part is a nightmare even fro experience toilet repairers, so if get frustrated or have to try this several times before you get it right, unfortunately that is normal.
Once you have the flush valve installed, hook the flapper chain onto the handle and turn the water on.

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One Comment

  1. Bob Calvo
    Posted March 4, 2012 at 7:18 pm | Permalink

    I can’t get to the bottom of the hinge bolts. Never saw this before. What am i missing. There’s no access from the bottom or thru the tank. Are they toggle bolts?

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