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Toilet cistern wont stop leaking?

Discussion in 'Plumbing and Central Heating' started by Mr Sparkle, 18 Jan 2021.

  1. Mr Sparkle

    Mr Sparkle

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    My friends closed couple toilet would leak whenever it was flushed

    So i replaced the 2" doughnut and cistern bolts

    This stopped the leak for a few days but now she says that it is leaking again. She cannot pinpoint the leak, apart from 'it's coming from the bottom of cistern again'

    I now plan to replace all of the parts that I can e.g. flush valve, fill valve, new doughnut, water isolator and toilet water connector

    When putting the new parts together, can I get some advice of some of the techniques to avoid leaks?

    For example use silicone or ptfe tape in certain places
     
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  3. terryplumb

    terryplumb

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    Replacing all those parts without knowing the actual cause of the leak is a bit pointless . Establish what is leaking and put that right.
     
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  4. blup

    blup

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    The bolts can cause leaking if overtightened or under tightened.

    Also the way the doughnut sits on the pan. Did you use boss white or other sealant when fitting the new doughnut?

    If the toilet is cracked that's another matter.

    Blup
     
  5. zebedee2001

    zebedee2001

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    Are you sure it isn't just condensation off the cistern?
     
  6. blup

    blup

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    Possibly, a piece of kitchen roll underneath will clarify that.

    Blup
     
  7. oldbuffer

    oldbuffer

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    Could also be the inlet valve leaking where it goes through the cistern, if bottom fill.
     
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