I have a valley one handle shower that is leaking from the tub spout. I have purchased a replacement cartridge from home depot. It matches very well. I changed it out and the tub spout still leaks when the water is turned on. I am not sure if I need to change the bonnet nut on the shower as well or if I missed a step.
I took the old cartridge out and just stuck in the new one, matching the notch on the side of the cartridge with the core of the faucet. Placed the faucet stem in the same orientation as it was in the old one. I was not sure about the two holes in the back of the cartridge, when installed the holes seem to align with the holes in the back of the core of the faucet. The front part of the cartridge was a separate piece and I matched the notch with the top of the cartridge that I just installed. It seemed to fit nicely. I screwed on the bonnet nut pretty tight. Turned on the water and it was still leaking a steady stream from the tub spout.
I uninstalled everything and tried it again only this time I made a mistake and I did not have the bonnet nut screwed on and then I turned on the water and blew everything out of the core of the faucet. The inside of the faucet core was dripping a small amount of water from the holes after I made this mistake. (I know, that was dumb, I probably have no business attempting this repair but I cannot afford a plumber at this time.) Hopefully this mistake did not damage the faucet itself.
The cartridge seems to be okay. I put it all back together and the faucet is still leaking a steady stream from the tub spout.
In the process of changing out the shower the bonnet nut has been damaged on the outside. I cannot get it any tighter at this point. Should there be an O ring inside this bonnet nut? Will tightening this bonnet nut stop the leak? Is it possible to fix this problem by purchasing a new bonnet nut? I can get another one from an online website for about $6.00. I was not sure if I missed anything else or not.
I hope you can help me. Thanks in advance for your time.