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Re: When I install this stem it turns and turns. What am...
It sounds like you didn't get the valve in properly. Is the newer required type? (Single stem) ,or is the older brass type? When you install the single type, they have a tab to keep the valve handle from spinning. Also, the valve can make the hot water either left or right depending on whether the valve is turned up or turned down before you install the handle.
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REmove old showerhead using two wrenches, one to hold the stem from the wall steady, then twist the head counterclockwise. Use the same wrenches to install the new one, twisting the head clockwise to tighten. But before you put it on, clean the threads on the stem with a rag and wrap teflon plumber's tape around the threads clockwise 4-5 turns. That keeps it from leaking and makes it easy to remove in the future.
Providing you have hot water everywhere else except shower, you have a bad mixing valve. Turn water off to your shower. You can pop out center piece of your plastic handle then remove screw and the rest of handle. There is a kind of c-clip that goes through the brass stem, through a slot in the side, you will need to remove, it might help to push in on mixing valve stem. When the c-clip is removed, the mixing valve should pull out from the brass stem. Depending on whether original install, if grease was used, it should pull out with some twisting and prying.Note how it comes out because you will want to put new one in same way. Sometimes these can be a real pain to get out, I have never broken one but, they can be tough and you don't want to break your lines. After old one is out, do the best you can to clean out inside valve. Make sure you apply grease to new valve. If water is backwards after install of new valve, hot on right, remove valve and turn 180 deg and re-install.
After you remove the chrome collar and plastic collar washer (behind the faucet handle), pry the beauty plate off the wall. Turn off the house main water supply. Remove the four screws and washer holding the cartridge and valve stem in place. Save the metal washer under the four screws for use with the new cartridge. Replace the stem/cartridge assembly and secure with the saved metal washer and four screws. Reinstall beauty plate, collar & collar washer, then handle.
I am not sure what brand of shower valve you have but it sounds like you lost a peice of rubber or plastic in the valve and it has either lodged in the diverter or somwhere from the valve to the shower head. Is it posible that you got the wrong stem or switched stems or maybe it was put in backwards. Wish i could narrow it down for you,Need better info.
There is a threaded stem that passes through the spout and attaches to the white plastic diveter valve. If you are starting from scratch (everything apart), you can put it back together in this order:
1) Place the white plastic diverter inside the spout. the circular side with the black round washer should face the the wall side of the shower (mating up against the threads for the water pipe).
2) The stem can now be inserted from the top and into the notched section of the white plastic diverter valve. The threaded end of the stem shoud be outside of the spout (from the top side).
3) A round black washer fits over the threads. It should sit right where the threads end. Dont push it all the way on to the unthreaded portion of the stem.
4) Screw the threaded knob onto the threads.
Should be ready to install now. Including the spout itself, there are 5 parts and are configured in this order from top to bottom.
1) Female threaded knob (the knob for operating the spout)
2) Threaded stem (threads on top)
3) Round black washer
5) Whit plastic diverter valve.
Mine leaks when I turn on the shower, thus reducing shower pressure. I looks like a poor design to me. The stem is not a tight fit in the spout and this allows the diverter to "wobble". The washer on the diverter valve does not seat tightly and allows water to leak out the tub spout when showering. I would replace the spout.
Turn off the water, remove the handle, escuchion, and stem.
Replace all washers/O-rings. If it is a plastic stem, replace the stem.
The seals are worn, allowing water to pass by.
On some really old valves, the actual metal walls of the valve eventually get worn, and washer replacement does not completely solve the problem, or last long. In that event, replacing the valve is about the only option.