Leaky toilet

[PlumbBobBob]

Is the ball valve the entire mechanism inside the toilet which allow the flushing to happen?

Is the syphon the big pipe taking the dirty water to the sewers?

no got them round the wrong way, ball valve is fill valve which lets water in, syphon is flush valve which lets water out by either push button or flush handle.

 

[JCplumb]

The leaking only happens when the cistern is filling up and about up to 5 minutes after filling up, then it stops.

My 2 guesses then.
1. Torbeck fill valve spraying because washer has gone and spray finding its way down back of cistern.
2. Opella/Delchem type fill valve and the back of the 'spout' has popped off, or spout is improperly positioned spraying water sideways aswell as down.

If you can take the lid off, do so and take a video of what happens in the cistern when you flush and the cistern is refilled.

 

[crouzilles]

Ok, plenty of words I don't understand, but here you go, a video [video=youtube;fGEz3-9aLVM]https://www.youtube.com/watch?v=fGEz3-9aLVM[/video] showing the filling up of the cistern.

The greenish stuff on the left is a toilet cleaner which has disintegrated into powder.
Regards
Crouz

 

[JCplumb]

Well that video poo-poos my theories.
Back to the close coupling ideas.
As mentioned by someone else earlier - did you try to tighten up the wing nuts that clamp the cistern to the pan?
The filling mechanism seems fine from what I saw, so my new guess (same as other posters) is that this will almost definitely be the donut seal between pan and cistern. If it's limited access then it will be a right pain to do.

 

[JCplumb]

you can decide as your taking the cistern off and putting a new donut on i would recomend changing the syphon and maybe the ball valve as well (depends if you can get at the ball valve while the cistern is on the wall fixed if you can you dont need to change it)

Shaun's spot on there, your latest video shows that cistern blocks (the green stuff) have been used at some time so it is likely to have shortened the life of those parts.
Once you have it sorted I would advise not to use those things anymore

 

[crouzilles]

Ok, thank you for the info. It is a tight fit, but I will take my time and there are reasons why I should not manage it.

Regards
Crouz

 

[crouzilles]

I only put that toilet cleaner thing in last week for the first time ever, that is when I realised there was a leak on the right hand side of the toilet. The greenish stuff is on the left hand side.
I don't believe it is that.

 

[crouzilles]

It's only been there a week an a bit, never used before. It's when I added it that I saw the leak at the opposite side.

 

[JCplumb]

No worries, just don't put any more in

 

[steadyon]

Some flush valves can send a "spout" of water up through the overflow hole when the lavatory is flushed. If the top does not seal properly this can then cause a drip immediately after the flush as the water drips off the inside of the lid. It then stops, and re-occurs at the next flush.

The flush valve is the bit in the middle, the inlet valve being the part on the right. Try filling the cistern, then flushing by operating the flush valve without putting the lid back on. See if there is a spurt of water going upwards, and, if there is, check that the lid is sealing properly when replaced.

If it were a drip from the bolts holding the cistern to the bowl, it would tend to drip all the time, not just after a flush.