In trying to remove diverter valve from Kohler shower faucet I stripped edges off of retainer nut. How can I remove diverter valve now to enable replacement?

follow this steps and fix it. God bless you
If a faucet leaks, replace seals and gaskets .
If a shower head leaks, create a better seal or replace seals .
If a sillcock wears out, replace the washers .
If a compression faucet drips from the spout, replace the washer and/or the seat .
If a faucet leaks from the handle, replace O-ring(s), replace the packing washer, tighten the packing nut, or replace worn packing, depending on the valve type .
If a ball or cartridge faucet leaks from the collar, replace worn O-rings .
If a disk faucet leaks around the base or has reduced flow, replace cracked or pitted disk assembly or worn inlet seals .
If there is water under the sink, tighten the faucet-set locknuts under the sink. You also can replace putty or a gasket, replace a worn faucet, or replace leaky supply tubes .
If the aerator leaks around the edge, replace the washer in the aerator .
If the spray hose leaks or has reduced flow, replace the O-ring on the diverter valve, replace a worn washer at the base of the spray head, or clean the diverter valve and spray head .

im sorry i dont know how to explain step by step what you have to do but i know what you are talking about and its called a diverter. they get stripped out and thats why the spout leaks. they are not difficult to replace depending on the model but some of them have to be sweat apart with a b-tank.

Turn off the water to the home. You need tthe stem beneath the handle. Remove the handle after locating the set screw, remove the cylindrical beauty cover, and unthread the retaining nut to access the valve stem. Take it to a plumbing supply house or home store to make certain of the match.

I can't turn my knob to shower off -can you please explain how to fix it. My e-mail is [email protected]

The cartridge has 2 or 3 o-ring type seals around it that feed the water through, it picks up both hot and cold and mixes them. Some cartridges are replaced as one, some you have to replace the seals, just take the faucet info to the hardware store and match it up. I think the diverter is for the shower. It sends the water up instead of out.

Verify the cold water outlet has equal pressure as the hot side outlet at the wall. Check the inlet screen on the cold side water line where it attatches to cold water pipe. The screen could be plugged. Then check the cold side hose for any restrictions. Also check if there is a screen on the outlet side of the cold water hose and see if it is plugged. Otherwise the faucet valve is mis-aligned and will need to be rotated and re-tightened to align the valve to the center so both sides have equal water flow.

washer on back of diverter stem needs replacing

Sounds like it was installed upside down or the cartridge is installed improperly

Probably has water deposit minerals build up on it. Push and or pull with pliers until freely moves,soak in Lime away solvent ,toothbrush on.

It is very possible that a piece of rubber from the old washer or some debris has found its way into the shower diverter or the showerhead. The first thing to try, is to take off the showerhead and see if you get water without it. If you get water then your problem is solved!!! Puchase a new showerhead or take apart the old one and soak it in CLR or Lime-Away to clean it. If that doesn't do the trick than, Turn off your water supply to hot and cold. Remove the diverter (if possible) and inspect for debris. If you want you can also take out the hot and cold stems for a total inspection of the inside of the faucet. You can then flush out the inside of the faucet cavity with a Turkey Baster or something to that effect. Put it all back together ( use a bit of vasaline on all the rubber washers so they do not get stressed when re-installing) and you should be able to take a shower.....Also, if it was a cartridge you replaced, you may have inserted it 180 degrees opposite......Hope this helps.....Joe