Removing the base of the dual flush valve

[hassanomar]

Hello

I've got a small drip at the back of the toilet. I've removed the dual flush valve from the base and the seal is OK on the bottom but there seems to be a leak from the base where it's screwed into the cistern.

I've tried to turn it to remove it to change the seal but the plastic extends where the overflow pipe is and hits the inside of the cistern so it doesn't screw off.

Any ideas on how to remove it so I can clean and reseal it? Picture attached.

Only thing that I can think of is the whole cistern needs removing first but I rather avoid doing that if there's a simple fix!

Many thanks

 

[just pumps]

You need to remove the cistern to remove that.

 

[Madrab]

There's a big nut on the bottom on the other side of the cistern soi as suggested the cistern needs lifted. You'll probably need a new doughnut too unless you can get it to sit exactly the same way again.

 

[HERTS P&D]

Sorry, it's a cistern off job.

Andy

 

[oldbuffer]

There are two possible sources of a leak from the cistern:
1. The base of the flush valve where it goes through the base of the cistern. As stated above, its a cistern off fix, and while off, replace doughnut washer and the two bolts going through the base of the cistern securing it to the pan.
2. Either or both of the two bolts securing the cistern to the pan. You can see the heads of these bolts in your photographs. Try tightening these, preferably by getting someone with a screwdriver to hold the heads steady while you use a spanner (or pliers if wing nuts) underneath. If you have to change these bolts then its cistern off as above.

 

[hassanomar]

Thanks guys removed the whole cistern cleaned all the seals and retightened and fitted a new doughnut washer. All working and no water leaks. Thanks for your advice