I need a piping diagram for a Moen s3371 and a s3600 valve

Is there a gasket in side or what dose the mateing surface look like

There should be a stopper valve on the sink's downspout (the first section of drain pipe). You SHOULD be able to loosen the nut holding the stopper valve's lever inside the pipe. Once you remove that nut, you can pull the lever out - that releases the stopper inside the sink, so you should start with the stopper OPEN, and hold it open with a chopstick or pencil or other tool when you remove that lever.

The lever and the bottom of the stopper itself will be wrapped with masses of hair. That's normal. Clean it up and reinsert it, put the nut back on & snug it down, then readjust the stopper.

If that's not enough, you may need to open the trap (the gooseneck-shaped piece of drain pipe under the sink) to clean it out.

yes and no. Find hot water heater and insure cold water supply valve is open all the way. check to see if there is a hot water supply value and that its open all the way. If you replace shower value over iron pipe on the hot side it is corroded up replace pipe and value. If copper, find hot side, find value and open it up.

probably have a kink on how water line feeding valve..if possible to cut drywall bhind tub valve and inspect pipe at bottom plate...moen faucets are equipped w/ anti scald device, pressure balanced (newer models) and this could cause cold water to overwhelm hot water...

The faucet was installed upside down.
The shower riser pipe in the wall is to short( the distance between the faucet and shower head).
One of the biggest problems is if your shower faucet was installed with Pex pipe to the tub spout. Pex pipe will restrict the flow and force the water back up and out of the shower head.
The tub spout must be piped with at least 1/2 brass pipe nipples and fittings, or 5/8 OD. copper pipe and fittings.
Hope this helps, if you further questions please let us know.

This is almost always caused by debris in the plumbing from the pipes or the water heater.

Sometimes it is caused by a defective OEM cartridge. Always buy genuine Moen parts.

Remove and inspect the cartridge. While it is out, briefly turn the water to the valve back on to insure the valve is free of particles and then reinstall. If the drip persists you will need to replace the cartridge again. Always flush the valve before installing new parts.

those are just trim kit numbers those do not show the valve.

Yes you need to remove the valve befor you solder the copper pipes on it. If you do not remove the valve you will melt it to the valve body and then it will not be useable.

it is used for keeping the valve from coming thru the big hole when you tighten up the main cover,...it's to go on the back of the shower wall,..you don't have to use it if your valve is secured enough via pipe clamps and/or the like. good luck

Gain access to wall where valve is located and with a copper cutter if copper pipe or pipe wrenckes if galvinized, and remove.