So we have the top of he cistern off, the handle removed, and we've undone the
two bolts that come up from underneath the pan and which screw into a metal
plate. We thought this would release the siphon, and indeed it can now rotate a
few degrees either way about a vertical axis, bur we want to take the siphon
out in order to get to the flap valve, but it doesn't want to come upwards. We
don't know what else to undo in order to get the siphon out. Any advice?
AFAIK there is a big nylon nut which holds the metal plate on to the base of
the syphon (just done one so I should remember - however...).
It should work like this.
You assemble the cistern off the loo, including clamping the metal plate
underneath using the big nut which holds the siphon into the cistern.
You then put a rubber 'do-nut' under this on the downpipe from the siphon.
You fit the cistern to the pan, resting everything on the 'do-nut' which
cusions the cistern and acts as a seal.
You pull the whole thing down with the two bolts through the metal plate.
You then attach the water (and overflow if you have an external one) and you
should be more or less there.
So to remove:
after (optional) draining, undo the cold feed and the overflow (if fitted)
undo the two metal bolts
lift the complete cistern off (either drained or still partly full of water
if you are in a hurry and strong).
turn the cistern upside down (without getting wet)
you can then remove the rubber 'do-nut', unscrew the nylon nut, remove the
metal plate and the siphon drops out of the top of the cistern
And when you replace it, use a 2 part syphon, so you don't have to repeat
the procedure in five or ten years. With these, just a small stub is mounted
into the bottom, with no moving parts. All the bits that go wrong, are in
the second bit which screws into the first and can be replaced in seconds.
I think he means the polythene flap thats inside the syphon and actually
starts teh syphon process..
Costs bugger all but they're a right pain to replace because you generally
have to take the whole cistern off the wall and pan and usually bolts,
screws etc are well rusted
Just been there last week. As reported, those two bolts were well
rusted. I was able to get one off because the porcelain on the toilet
bowl had cracked (wasn't me guv - there were stains on the inside of
the crack which meant it had been there a long time). The other one
would not budge even with mole grips on each end - and Plusgas
The only option I had for that remaining bolt was to first grind a
flat spot on the head, then drill a central hole which allowed the
head to fall off - releasing the bolt.
I now live in fear of coming across a cistern where both these bolts
are held in without there being cracked porcelain on one side.....
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