Baxi 105e dripping when hot water is running

[Jonny brown]

Good evening.
My elderly baxi 105e drips from between the pressure differential valve and the Bush nut that connects it to the rest of the diverter valve. I think it only happens when I'm using hot water.
Any ideas what to replace?

 

[ianmcd]

Pics are always best but I think you mean the gland nut, comes as part of the diverter valve service kit, but you can buy the gland nut on its own

 

[Jonny brown]

The water is dripping at that joint.

 

[gas112]

it can be leaking from one of two places the usual is the back of diff valve so the valve needs it needs taken off
turn off the cold remove the two bundy tubes on top and undo the 2 grub screws holding it to the rest of the valve
undo the nut at back of valve the pin comes through there is a small Oring that the pin passes through that wears .
but you will have to split the valve to get the bearing plate with pin on it out the way to get the O ring out whilst doing it change the diaphragm as well .

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[gas112]

the second place it can leak from is the pin that comes through the bush nut and its a case of removing housing as before but now you need to drain the heating side of the boiler and change the bush nut and the pin that comes through it , here is a kit you use . You dont have to use all the bits just the two i have mentioned but this kit also comes with the diaphragm and small washer required so better to buy this in first place just in case .

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[Jonny brown]

Can I replace the Bush nut in situ or will I need to replace it with everything taken off ?

 

[gas112]

Can I replace the Bush nut in situ or will I need to replace it with everything taken off ?

just got to take the diff valve off

 

[ianmcd]

just got to take the diff valve off

I have never had to remove the whole valve to change that

 

[ianmcd]

Can I replace the Bush nut in situ or will I need to replace it with everything taken off ?

Are you having to top up the boiler system pressure ?

 

[Jonny brown]

No I haven't topped it up at all . It was serviced in April, the engineer could of topped it up

 

[ianmcd]

No I haven't topped it up at all . It was serviced in April, the engineer could of topped it up

Then as @CBW correctly advised you in an earlier post, your problem is the DHW section and not where you think it is, if you look closely there are 4 x tappings on that and only 2 x screw so the easiest way for the water to leak is through the open tappings , you need the part that @gas112 quoted in #4 and it is that tiny O ring , make sure you properly clean the push rod and swap out the diaphragm at the same time , no need to drain any thing

 

[Jonny brown]

Just a quick update. When I got up this morning there was a drip of water on the valve . I had a sniff and it smells chemically, it's certainly not fresh water .
I might just change both ends to be sure . Thanks again everyone

 

[CBW]

Thanks @ianmcd but I didn’t advise in this one

 

[ianmcd]

Thanks @ianmcd but I didn’t advise in this one

Sorry mate must be mixing it up with another post

 

[Jonny brown]

does this bush nut look incomplete? Shouldn't it have a white plastic bit in the middle and not just a hole?