How to replace a leaky WC Cistern syphon

[siliconeseal]

Hello all,

I have an ancient Cistern syphon (see attached photos IMG_9460, IMG_9461), which was seen by a plumber 4 years ago, because the WC handle became difficult to turn. I had wanted a new syphon but the plumber took a look at the crack on top of the handle (IMG_9462) and declined to replace the syphon. Instead, he squirted some WD-40 around the handle, and this solved the handle turning problem.

For the last year or so, the syphon has started to leak appreciable amounts of water into the commode (see IMG_9459). This problem now causes my water bill to be 60% higher than before and I am keen to replace the syphon with a new one to stop this leak.

Please advise me on how to remove this faulty syphon and replace it with a new one. I already have a Dudley Turbo 88 syphon (IMG_9464) which I bought 4 years ago, just before calling in the plumber, if this is suitable. IMG_9466 is my best shot of the cistern base.

Incidentally, the photo IMG_9467 shows that there is a gate valve between the loft water reservoir tank and the WC. The top of the pipe containing the valve, goes to the loft water tank, then moving down this pipe we reach the gate valve, then the connection to the WC, and finally it (the white PVC tubing at the lowermost end of this pipe) goes to the bathroom adjacent to the Loo.

Many thanks in advance!

 

[HERTS P&D]

That toilet has been a toilet too long.

New toilet time.

Andy

 

[CountryFan]

Ime, it’s usually the float valve passing water via the internal overflow, not the actual syphons.

 

[siliconeseal]

Thanks CountryFan. What do I do to check if it is the float valve which is faulty? Remove the cistern cover and hold the float ball up, and see if the water is still forming the ripples?
To Herts P&D, if you mean the orange colour of the first photo, then its a trick of the camera flash used to get a clear photo of the water ripples. The toilet bowl is clean. It took me 5 attempts to get a reasonable image of the water ripples.

UPDATE: I held the float ball up for 3 minutes. It made no difference to the water ripples. That rules out the float valve as being faulty.