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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???
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.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.
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? 13:04 www.youtube.com/watch?v=Hmhb4H4HYMY Mar 31, 2012 - Uploaded by Dino Pinch
best kohler rialto / san raphael toilet repair video on youtube. ...the kohler brand rialto model wisks away the offending lumps of ur behind product, never to be seen again. .... 'can't screw a lightbulb in'. .... How to Install Toilet Seat on Kohler One-piece ModelK3434 - Duration: 7:10. by emf4kv 20,891 views.
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.
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.
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. Good luck Max
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:
1. Use 1/8" drill bit and drill and drill around the bolt until the anchor material can be removed.
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)
4. Assemble carefully not to over tighten and crack the porcelain.
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.
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.
cut the head off from top use a dremel ,wizard or drill with a cut off wheel or sawsall use very carefully and support nut so it doesnt rattle and crack porcelain
If your problem is like mine your toilet seat is loose and swivels when you sit on it. If you try to tighten down the screw it won't tighten. Use instructions above to remove old hardware.
To fix with new hardware
Purchase Hilti brand 3/16" x 2-1/2" Toggler Brand Toggle Bolt (Home Depot sells the kit). Kit comes with 10. You will only need 2. My last repair lasted about 8 years (with new kit = 40 years left or the purchase of a new toilet - whichever comes first). Set comes with 3/16 flat head screws. I recommend purchasing 3/16" 2" round head screws with matching flat washers. Sink Metal Toggler into hole with toggler pointing straight up (it's attached by long plastic legs). As it goes in the hole it opens up. Pull up on the plastic pull rings as tight as you can until the toggler is tight up against the inner porcelain of the bowl (similar to tightening cable ties). Line the seat up with the holes and it's new plastic adapter (that won't slip into the hole courtesy of Hilti). Slide washer underneath round head screw but on top of toilet seat assembly and screw directly into the newly installed toggler which is sunk in bowl/abyss receptacle. Repair should take around 5 minutes.
Unfortunately the bolt is encased and not accessable.
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.
I will never buy a Kohler toilet all in one ever again, unexessable screws
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