Need instruction to install danco model 3s-16h/c stem

Turn off the water supplying the faucet. Now open the faucet. Remove handle by taking off index button and removing screw. You may need to purchase a handle puller, 10-15 dollars, and a stem wrench set. After removing handle, place appropiate sized wrench on stem and turn counter clockwise. Before installing stem, make sure it is in the open position. You may need to use the handle to turn the new stem. Screw in clockwise.

It sounds like you might be missing a part. Check your list for all included parts. All parts are critical.

order a moen replacement online from
www.plumbersurplus.com/Prod/Delta-Faucet-Company-RP24096.

Sometimes on the stems on the side the handle attaches is a nut that can be tightened. Inside this nut is a rubber or other type of seal. tightening this nut stops the water from coming out of the handle. If the nut has already been tightened then possibly need to replace this rubber seal.

http://kitchen-bath.hometownhardware.com/Faucet_parts-ssd70982-p9-l1-t1-Sv-dirasc-PP10.html

One of two things has happened. I'm assuming you only get hot water when you open the valve and that this is for a single handle control shower fixture. If so either this is the wrong valve for your shower control or it is installed backwards. Sometimes the valve can be installed at either 180 degree angles. See if it can be installed any other way. If so this may solve the problem.

there is never a fiction ring at the washer end, sometimes there is a cup shaped part that holds the washer but nothing else so it must be intended to go around the stem

Thae stem you got that said hot/cold were designed to fit old style cross handle faucets. So both hot and cold turned the same way. If the cold side you are replacing turns the opposite direction then you will need to get a cold stem. Danco does make them. Ask the retailer where you purchased the H/C stem. I hope this helps..

the spring goes in first then the rubber seat goes on top.put them together first on a small screwdriver,insert on hole push down on rubber into hole it should stay.replace stem in reverse order of takeing off.