Single lever monobloc mixer tap with new cartridge is still leaking (not dripping from spout). | Plumbing Jobs | The Job-board | Plumbers Forums

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Single lever monobloc mixer tap with new cartridge is still leaking (not dripping from spout).

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Discuss Single lever monobloc mixer tap with new cartridge is still leaking (not dripping from spout). in the Plumbing Jobs | The Job-board area at Plumbers Forums

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Phil157

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The tap was leaking from its body (under the 2-way swivel handle; where you access the big brass nut and the cartridge) when turned ON more that a little bit. I've replaced the cartridge and it leaks in same way.
It doesn't drip from the spout nor leak when turned off. So, as far as I can see there's only one 3-hole o-ring seal between cartridge bottom and tap body. If this was leaking I'd expect a drip and leak with tap turned OFF, due to the static water pressure. If not, then I'm flummoxed - leaking through body of cartridge?? - By the way, we've done it on 2 taps with identical results.
Phil.
 
Here you go, fairly self-explanatory. I guess that taps & china were sourced together; the basin says it's "Roca".
Interior bathroom tap-med res.jpg
Exterior bathroom tap-low res.jpg
 
I can only tell you that they look identical to the ones that came out and spigots slotted in nicely, they felt properly seated, and diameter is easy fit (not touching the body).
Just looked at old one, it says "MS 2005 oct - 22", I think building was finished in 2008.
 
The three o-rings are hot in, cold in, blend out. So if the blend out one is leaking it can behave as yours is.

Try removing the cartridge and carefully cleaning up the seat then replace cartridge with a smidge of silicone grease on each oring( making sure they are seated properly.)

The shroud looks a bit mullered! That won’t make it leak of course but may affect ease of use.
 
Aha, yes, I see what you mean, Ben-gee, thanks. I'll have to get organised tomorrow and have another look.

The shroud indicates its age and the amount of limescale that was cementing it tight - it took a makeshift oil-filter wrench sort of arrangement with rubber bands providing friction!
 
I know where you’ve been!

Those shrouds are yet another triumph of form over function, would it kill the “designer” to put us a couple of flats on the thing?
 
Just because a cartridge fits does not mean it works. With 40mm carts like that many have orings on the body. In addition, the end seal orings must be the correct dia.

Many of these carts are only tested to a pathetic 4 bar too and leak internally once that's exceeded.

In this instance, I would personally go back to the manu. For example, Grohe test their carts to 6-8bar.

In addition, over tightening the top nut can distort the cart and cause leakage. Its vital its done up to the correct torque.
 
Hmm, thanks YDave, where can I find the correct value of torque?
When talking about o-rings I'm not sure of the terminology - like I said the only visible is one (gasket, perhaps) with 3 openings. I'm including a photo with contrast turned right up (an old one complete with limescale) - I hope this doesn't affect your thinking - The new ones came complete with rubber gasket in its recess.
Cartridge base.jpg
 
With seeing the new I cannot comment further.

I can however tell you that the old cartridge is a quailty item. Most sold online today are nowhere near as good as this one.
 
Ben-gee said:
I know where you’ve been!

Those shrouds are yet another triumph of form over function, would it kill the “designer” to put us a couple of flats on the thing?
Click to expand...

Engineers would have done that Ben. The accountants however would have removed them as they add to the price the manu would pay...
 
Last edited by a moderator:
As to correct torque, not much!

I have “nipped up” the large brass nut on one of these only to find myself with a slack handful of assorted plastic bits, mind you I was cross about something at the time and have proper plumber’s forearms!
 
Right - I think the guy may have judged it by the torque to undo it - including the limescale stiction!

Is that big brass top nut standardised? - I measure it once at 30mm (across flats), 2nd time 32mm, and just for fun (showing my age) 1 3/16 inches.
I was cringing to see a mole wrench tightened onto it, there's not a great deal of metal thickness in places.
 
Ben-gee said:
As to correct torque, not much!

I have “nipped up” the large brass nut on one of these only to find myself with a slack handful of assorted plastic bits, mind you I was cross about something at the time and have proper plumber’s forearms!
Click to expand...
Do you have callousses on your favoured palm too? :D:D:D
 
No
Phil157 said:
Right - I think the guy may have judged it by the torque to undo it - including the limescale stiction!

Is that big brass top nut standardised? - I measure it once at 30mm (across flats), 2nd time 32mm, and just for fun (showing my age) 1 3/16 inches.
I was cringing to see a mole wrench tightened onto it, there's not a great deal of metal thickness in places.
Click to expand...

Many the same but there is no standard.
 
Firstly find an identical cartridge. Make sure it has the filter mesh inside too. Make sure its tested to 6 bar plus.
Install it having cleaned all the seats. Tighten the lock nut literally finger tight and turn on your supplies just enough to begin to pressurise. Tighten the nut up enough to simply stop it leaking - I'd suggest a 1/4 turn at a time. Once it stops do another 1/8th turn.
 
Thanks Dave, I think the cartridges are identical and with mesh.

I haven't been able to get to it today so timing is good. Excellent torquing advice, thanks - bit like my Mini front hubs nuts; tighten so far then a bit more until you can get the split pin through the castellations; takes me back a couple of decades!
 
I've not been around for a while and just wanted to thank everybody for their contributions. I now have 1 tap that refuses to stop leaking, but the attached photo should explain why!

Threads backlit by red torch.jpg


Having prepared myself to email the manufacturers and parts people etc. I googled "spare parts for taps" - the first link was to Ebay and their first listing had a photo I immediately recognised for a 40mm top nut and cover!!!
I'm expecting it soon and have fingers all crossed.

cheers guys, Phil.
 
Did you get this problem sorted? I am having the same problem....changed the cartridge but still leaking from the bottom of the shroud
 
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