Kitchen mixer tap problem

If it is a conventional design then have the seats become rough? Could a tool like this help.

Dave

Thanks Dave. I might go for that if no-one here thinks the quarter turn cartridges will work.

OK...

OK...

Before you do that, invest in a tap seat grinding kit.

And persevere. I had what looked like casting flaws in mine and just kept on grinding till it felt smooth to a fingertip.

New washer and its still OK after 18 months...

Hang on. you said quarter turn, and you said washer. It can't be both....ah my bad. You want to replace WITH a quarter turn. No idea if it will fit.

Mmm. It does look very much as if a ceramic kit will work. The seal is on an O-ring same as current and the thread looks the same on all the kits.

Well I can pretty much guarantee a regrind and new washer will fix, if you want to keep the multi-turn

The ceramic cartridges are cheap enough, but the last time I had one that dripped :-)

I think both are viable options.

When I replaced the washers I don't remember seeing any corrosion or signs of wear on the seats but I'll have another look and see if a cutter could improve them. Thanks for your advice.

Run a fingernail around. Look for cracks or roughness

As others have said, if changing the washer doesn't work for long, it looks like the seats need re-grinding.

You can use a quarter-turn ceramic cartridge, but the body of that needs to seal against a decent seat. Just fitting one of those won't fix the problem, but fitting one *after* grinding the seat will do so.

I think I might have solved it. I took the cold cartridge out to check the seat and it was clean, shiny and flat. I then looked at the washer and saw it had raised letters (brand name) on the side facing the seat. It was also creased from our very hard twisting so I replaced it with a spare of the same make and made sure the letters faced away from the seat. It's working perfectly now, I just wonder how long it will last.