[Shop-talk] Sealing toilet tank mounting bolts?

[Jeff Scarbrough]

So, it looks like the grommets don't compress enough because the toilet
tank rests on the center hole before they squeeze out enough?  If so, I
would either:

A - Use some silicone sealer (for kitchens and bathrooms) around the
grommet in the tank hole as I put it together, or

B - Use a large plastic washer as a shim between the grommet and the bowl
top ledge.  This would require some careful guesswork, I reckon, to get
the right thickness to do the job correctly.

I might go all SAT and choose "Both A and B".

I don't understand why they don't want you to use sealer, as I assume they
are replacing the defective parts.



On Thu, Nov 21, 2024 at 8:43 AM Jim Franklin <jamesf at groupwbench.org> wrote:

> I bought 3 Kohler Cimarron toilets for a job I'm doing, because the one in
> my house is great. Well, the new ones are very different and I should have
> read all the reviews on the Home Depot site.
>
> The tank-to-bowl connection is made with 2 bolts that pass through
> grommets. These grommets expand as the bolts are tightened, sealing the
> holes in the tank through which they pass. Problem is, quality control let
> some tanks through with holes oversize enough that the grommets won't seal.
> Kohler even sent me a new supposedly redesigned grommet kit, which slowed
> down the leaks to a drip once per minute. They said they'd send a new tank
> but can't expedite it, so we're looking at after Thanksgiving, and no
> guarantee that the new tank won't also be mismanufactured.
>
> My thought is to use a sealant on the grommets. Kohler said "we don't
> advise that", but I really need to wrap this up. Is there a
> rubber-compatible, submergeable sealant that will work in this application?
>
> Another thought I just had is to add washers on top of the bowl where the
> bottom of the grommets sit so that the grommets are compressed another
> 1/16". But I don't want the grommets to then start leaking on the inside
> along the bolt if I overcompress and they open up.
>
> There are images near the bottom of this page:
>
>
> https://www.faucet.com/kohler-k-31615-white-cimarron-1-28-gpf-toilet-tank-only-left-hand-lever/f4091621#reviews
>
> thanks,
> jim
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