changing faucet washer

[atlantis]

I'm trying to dis-assemble a bathroom sink faucet to change the washer. Problem is that I can't figure out how to get the stem separated from the part that contains the seat. I don't know the faucet brand, but it's about 30 yrs old-----maybe Delta.
When I remove the cap, I see the stem exiting from a threaded brass seat, which is directly held onto the sink by a knurled nut (for hand tightening. A decorative cap for the sink top also screws onto this thread on top of the knurled nut.
At the very top of the 'seat' is a section of brass thru which the stem exits, and this section is flattened on both sides, obviously in order to accomodate a wrench. I cant see any seam between the threaded section and the upper section, but I assume there must be one.
Where is it safe to hold the lower section of this fitting so that I may separate the stem from the seat? Do I need one of those under-sink wrenches?

[HayZee518]

the "seat" is inside the valve body. the whole thing you are referring to is the valve stem. old faucets have an acorn shaped "gland nut" that goes over the stem and has a graphite or "o" ring packing, then the stem has the coarse valve sten threads that match the internal of the valve and finally the valve stem washer is held by one screw in the bottom of the stem. newer two valve stem faucets have the knob escutcheon, the knob, the screw which holds the knob to the stem, the knurled valve stem top, the hex or two flats that unscrew the stem from the valve body. the stem will have the coarse threaded portion and the stem washer at the bottom. again the "seat" has a hexagonal opening or square opening that takes an allen wrench or square wrench to remove the seat and replace. 1930's faucets didn't have replacement seats - you had to grind the seats flat with a seat resurfacer.

[Redwood]

Why don't you post a picture?

We have even less chance of knowing than you.

But with a pic we might know exactly what you are talking about.

[atlantis]

OK----not the greatest photo, but I hope it helps you help me!

[atlantis]

Hayzee:
30 years old, not 1930's. I'm also familiar with 100 yr old acorn nuts, and this isn't one of them. I'm trying to disconnect the valve stem from the valve body----that's all. Don't need allen wrenches or anything else---- all I weant to do is get the valve open to replace the washer

[HayZee518]

yeah, ok. open the valve partially with the knob and take the knob off. use an adjustable wrench and unscrew the thing with the two flats counter-clockwise. once its loose, open the valve fully and the stem will come out.

[atlantis]

Hayzee;
the question is "what do I hold to safely counter-torque the valve assembly while I'm removing the valve-stem?"
As mentioned, everything below the slotted area on top is threaded, so I don't want to grab that with a wrench. Even in the valve assembly below the sink top, there isn't anything obvious for a wrench to be applied.

[HayZee518]

underneath the sink porcelain is a locknut that screws right over the 1/2"npt threads. this is what holds the valve to the porcelain. you might get a helper to use a basin wrench from underneath to hold the valve body/locknut from turning.

[atlantis]

Originally Posted by HayZee518

underneath the sink porcelain is a locknut that screws right over the 1/2"npt threads. this is what holds the valve to the porcelain. you might get a helper to use a basin wrench from underneath to hold the valve body/locknut from turning.

>>>>>>>>>>>>>
Yes, there is a pair of 'locknuts', one beneath porcelain and one above porcelain, but neither of these are part of the valve assembly. They are only threaded onto the valve body to hold it in position. Gripping either of these with a wrench will not hold the valve body in order to counter-torque removing the valve stem.
I guess I'll just have to take all the connections off from beneath the sink so that I can safely hold the valve body without breaking the connections.
Any other suggestions?

[HayZee518]

so put the basin wrench on the threads under the sink and unscrew the two flats gland nut.