Toto Toilet Noise After Flushing

[Willard]

I have a Toto Soiree toilet (CST 964 CF). Some minutes after flushing it, and after the toilet has filled, it will make a sound like "goosh, goosh, goosh, goosh". This sound continues for 4 - 5 seconds before stopping. A few minutes later this sound will repeat, until I flush the same toilet again. The sound is most likely to occur when the flush handle is held down to evacuate solids completely, though it occasionally happens with a quick flush, too. This sound is clearly made by water in the pipes, but I cannot figure out what the cause is. Could a faulty valve (Cyclone 528) be causing this problem, or should I look elsewhere? Thanks for your advice!

 

[WorthFlorida]

Sounds like the flapper is leaking. As the water level in the tank drops, the flush valve opens to fill the tank but only to add an inch or two of water. Sometimes a quick fix is rub your fingers around the bottom part of the flapper to remove slime or deposits to get a better seal but most time the flapper needs a replacement. part number 5.

https://www.totousa.com/filemanager_uploads/product_assets/PD-00364_MS964214CEFG.pdf

 

[Sponsor]

 

[Reach4]

Make sure the refill hose is held above the overflow and is not down the overflow. Make sure the water level is about 1/2 inch below the overflow.

I would make sure the sound won't happen if I close the stop valve at the wall after the tank fills.

If no sound with the valve closed, I would check my water pressure.

If water pressure is under 80, I would replace the seal on my fill valve or replace my fill valve. https://www.korky.com/products/fill...cessories/replacement-cap-assembly-fill-valve

I really don't know what causes this, and my comments are pretty generic. It will be interesting when you identify the cause.

 

[Jadnashua]

With the fill valve supplied to Toto from Korky, the seal in the cap over time becomes stiffer and doesn't always release fully once the toilet is flushed, and eventually cracks, leading to it leaking. So, my general procedure is to replace it when I notice a delay on refill after flushing, before it ends up cracking, and not ever stopping. Replacing that seal is about a $3 and 5-minute operation with no tools required. Much easier than replacing the whole fill valve which may never need replacing for the life of the toilet.

It doesn't sound like that's the problem, but as the fill valve seal gets stiffer, it can cause a stutter before it decides to slide back into a position it will ultimately end up sealing. When new, the seal is a smooth dome. Once it starts to harden, it will take the shape of the seat it rests on. The life of the seal will depend on both your water pressure and the water processing chemicals left in it from your utility.

If the toilet doesn't end up running from a leak, I'd probably not spend much time investigating further. I do try to have a spare flapper valve and cap around so when I do notice a problem, I don't have to run to the store right away, and replace my spare when I get a chance on my time.

 

[Willard]

Sounds like the flapper is leaking. As the water level in the tank drops, the flush valve opens to fill the tank but only to add an inch or two of water. Sometimes a quick fix is rub your fingers around the bottom part of the flapper to remove slime or deposits to get a better seal but most time the flapper needs a replacement. part number 5.

https://www.totousa.com/filemanager_uploads/product_assets/PD-00364_MS964214CEFG.pdf

View attachment 68506

Thank you very much for taking the time to reply. Your diagnosis seems correct, though I don't understand why the toilet would make this sound repeatedly (approx. 5-6 times/second), as if the fill were starting, then stopping multiple times in rapid succession. (Perhaps I should attempt to observe this with the tank lid off.) The flapper does have some calcium deposits that are cedrtainly affecting the seal, so I will replace it and see what results. Thank you again for helping a stranger!!

 

[Willard]

Make sure the refill hose is held above the overflow and is not down the overflow. Make sure the water level is about 1/2 inch below the overflow.

I would make sure the sound won't happen if I close the stop valve at the wall after the tank fills.

If no sound with the valve closed, I would check my water pressure.

If water pressure is under 80, I would replace the seal on my fill valve or replace my fill valve. https://www.korky.com/products/fill...cessories/replacement-cap-assembly-fill-valve

I really don't know what causes this, and my comments are pretty generic. It will be interesting when you identify the cause.

Thank you so much. Your ideas and investigative procedures are quite interesting, and I will definitely use your advice!

 

[Willard]

With the fill valve supplied to Toto from Korky, the seal in the cap over time becomes stiffer and doesn't always release fully once the toilet is flushed, and eventually cracks, leading to it leaking. So, my general procedure is to replace it when I notice a delay on refill after flushing, before it ends up cracking, and not ever stopping. Replacing that seal is about a $3 and 5-minute operation with no tools required. Much easier than replacing the whole fill valve which may never need replacing for the life of the toilet.

It doesn't sound like that's the problem, but as the fill valve seal gets stiffer, it can cause a stutter before it decides to slide back into a position it will ultimately end up sealing. When new, the seal is a smooth dome. Once it starts to harden, it will take the shape of the seat it rests on. The life of the seal will depend on both your water pressure and the water processing chemicals left in it from your utility.

If the toilet doesn't end up running from a leak, I'd probably not spend much time investigating further. I do try to have a spare flapper valve and cap around so when I do notice a problem, I don't have to run to the store right away, and replace my spare when I get a chance on my time.

Thank you. You certainly appear to have in-depth knowledge of these toilets, and I suspect that the fill valve seal may be to blame. That's the sort of thing a novice like me is unlikely to think of. I will order a replacement seal. Thanks again!