Leaking water inlet to Cistern

[macridgway]

Hi everyone, thanks for your time reading this!

We have noticed a leak appearing from the built-in toilet in our main bathroom that's spreading around our floors (great start to the year!). I've removed the panel behind the flusher and can see the water inlet attaching to the Cistern is slowly dripping. Shutting off the water valve stops the leak but I wondered how easy this would be to replace/fix. I'm guessing the plastic somewhere in the connection has broken or split but want to know if shutting off the water valve will allow me to unscrew it to inspect and replace it.

I've attached a photo to show the leak and Cistern.

Any advice would be really appreciated!

 

[Deleted member 120897]

Yes, isolating the water at that point would allow you to undo it and inspect it. Could be a washer or could be a split.

 

[macridgway]

Thanks Chris, I've now removed the feed at the top and there were bits of old brittle filler of some sort falling out of the plastic nut. Is it safe to add sealant or do I need to get a rubber washer in there?

 

[Deleted member 120897]

Definitely don’t use silicone! Looks like there‘s a rubber washer in there already, so it’s either failed, or it’s the filling valve plastic thread.

 

[Chuck]

The 'brittle filler' is probably a previous attempt to bodge the leak. Probably means that you'll need to replace more than just the sealing ring to make a proper job of it.

 

[snowhead]

Looks like the nut on the elbow is bottoming out on the nut on the tail of the fill valve, stopping it compressing the washer.

Is there another nut on the other side of the cistern that will allow more of the threaded tail to show through?

The filler may be parts of the thread on the fill valve breaking off.

 

[macridgway]

Yes, I think you're right in terms of stopping the compression between the washer and the thread. I've tried giving more thread on the water inlet side but it still leaks once the toilet stops flushing and the pressure builds back up. I think as Chuck mentioned, I might need more parts to sort out the issue.