Question about Kohler 3386-6 Rialto Skylight Round Front Toilet

1 Answer

Can not remove toilet seat from Kohler Rialto

Nut is enclosed in one piece design with no way to access. I guess I will have to cut the bolt and apoxy a nut in the hole unless someone else has a sugestion???

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  • phmaddnes
    phmaddnes Jul 03, 2009

    Unfortunately the bolt is encased and not accessable.

  • phmaddnes
    phmaddnes Jul 03, 2009

    Here was my fix.

    Kohler Rialto Toilet seat replacement.

    Use dremel to cut off old bolt and allow it to fall into the black abyss that is the genius of Kohler engineering. Enlarge the hole to 3/8. I worked up to that size slowly increasing bit size so as not to crack porcelin. At Home Depot I bought a 1/4 x 20 x20mm "Insert Nut" and a good 2 part epoxy meant for metal and ceramic. Gently tap the Insert nut about 1/2 way into the hole and apply epoxy all the way around. Continue tapping the insert nut until it is flush. Clean off excess epoxy and allow to set. Now attach any standard round toilet seat using the standard 1/4 nut that comes with it. I used a Kohler "Cachet" round toilet seat to replace the Kohler "French Curve" that comes standard with the Rialto. All in all it should take you about 1/2 hour.

  • Jim McCard
    Jim McCard Aug 29, 2013

    I will never buy a Kohler toilet all in one ever again, unexessable screws

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  • Master
  • 867 Answers

To access the nut remove the tank lid, then go down and forward, its there.

Posted on Jul 03, 2009

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I have a Koehler model 703 84679aa. The seat bolt is loose and you cannot get to the but without pulling the toilet. Does anyone know how to tighten the seat without removing the whole toilet?


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I have a koehler rialto toilet and am unable to replace the seat as the screws keep spinning and there is no way to access the bolts form underneath as the toilet is totaly sealed. Other than replacing the...


Wrap a putty knife with a wash cloth, and push it between the toilet ceramic surface and the plastic hinge for the seat. Wedge it in there. Now try unscrewing the hinge screw. This provides back pressure against the hidden nut on the other side and may let you successfully remove the screw.

Jul 04, 2011 | Kohler 3386-6 Rialto Skylight Round Front...

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The Rialto toilet makes it very difficult to replace the seat as you cannot access the wing nuts which in a moment of engineering genius you put inside the bowl I have already purchased a French seat to...


You should be able to remove the tank lid, reach into the cistern and find submerged at the bottom towards the front of the toilet the plastic wing nuts, hold onto these while tightening the plastic bolt from the top.

I have a Kohler toilet with a similar design, not sure if it is this exact model but they look very similar so I hope this works for you.

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I can't get to the nuts on the toilet seat in order to loosen them so I can change my broken toilet seat.


I just had the same problem.I can not believe that kohler would design such a flaw. I have four of these toilets in my house,and it would be ridiculously expensive to replace, especially for a seat. To fix it I went to OSH and got some 1/4-20 T nuts, went home cut the bolts off the seat (multi master dremel) with metal cutting blade. With a screw driver tapped the bolt and the small area around the bolt down into the toilet area. Now you have just a porcelain hole. Clean area with solvent (lacquer thinner),get some gel type super glue from hobby shop and put it on inside and top edge of the hole on the toilet. Put some glue around the shaft and under side of the T nut and slip it into the hole.Then put a SMALL bead of glue around where the T nut makes contact with toilet and let it dry aprox 1/2 hour. Now you have a permanent fix.To prevent a problem getting the bolt out in the future,put some anti seize (auto part store) on the threads of the new bolts. Hope this helps.
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Kohler will try to sell you $46 anchor bolt kit 84999 & also there special tool. You should expect that for a $400 toilet.

Try this instead:
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2. Carefully clean hole with 11/32 drill to remove all remaining acchor material.
3. Go local hardware store & buy a 10 - 32 3/8"X3/4" rubber expansion plug (make certain threaded part is brass & has shoulder on 1 end), a 10 - 32X1.5" Phillips bolt and couple of small fender washers fit the seat.(about $4 for 2)
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Hope it helps

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Roberta3fan could be giving bad advice based on experience with other toilets. This does not seem to be an option for this toilet design. I am in a similar situation and it appears that the nut (and it is a metal bolt) is not what you would expect. Here is a picture of the anchor kit for this toilet seat: http://www.plumbingsupply.com/images/kohler-anchorkit-84999.jpg I am going to assume that the sleave that should be engaging the bolt is cross threaded and try to grab it with a pair of vice grips. I'll let you know if it works.

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Here's what I did. Unscrew them as much as possible. Then I used a bolt cutter and hacksaw to cut away as much of the plastic seat holders as possible. I could then remove most of the seat, and get better access to the screws. I then raised the loose screws enough to cut them with a bolt cutter. Soft screws cut easily. The screw heads are now out. Now, tap down on the screw/anchor and it falls into the bowl. It will stay there. The remaining problem is that you need anchors to secure the new toilet seat. Kohler wants $50. I have a usable but loose seat. Never again-Kohler.
I strongly recommend using a boltcutter. A hacksaw will tear up the bowl.

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1 Answer

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To fix with new hardware

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