I have a dipping faucet in my bathroom tub. I

we would need a little more information but sounds like it will need replacement, The water will eat up the meatle and make a rebuild impossible sorry but no quick fix the hot water lineis usley the culprit

This is a Moen single lever bathroom faucet. The Cartridge needed is Moen 4000.

Change the gaskets.

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Replace the valve body if it is a single valve design. Replace both hot and cold valve bodies if it has separate handles. They are not expensive if you hava a faucet worth fixing. If they are not available, either your faucet is too old or not worth fixing. When in doubt, call a plumber.

Sounds like washer pieces. Your faucet has rubber parts and they can eventually fail, Look also at the shut off valves, as they break apart (the washers) eventually.

Hot on left.
Cold on right.
Some single handle faucets have bleed-over where both hot and cold enter mixing valve each time handle is turned on, even when faucet calls for just cold or just hot.
Otherwise maybe a do-it-yourself plumber got pipes backwards... or maybe the tub used to be on other side of wall, and tub was moved during remodeling but pipes were not changed.

To fix problem:
First of all, turn off shower faucet. Turn on Hot at sink and put ear against shower faucet listening for sound of water flowing through the mixing valve.
If mixing valve is working fine, you need to open wall and investigate more.
For example if you have access door, reach in and feel which pipe is hot.
Pipes might need to be reversed if problem comes up in home inspection, otherwise the problem will not harm anything.

Hello,
There is a restriction in the faucet or the piping to the faucet on the hot wtaer side...this will be very hard to find and fix... The shower uses less water so it will get hot.... the tub spout allows more water flow so you cannot get the water more then warm...

Take the faucet apart and blow out all the passage ways with air... also run some water from the piping while the guts are out of the faucet, to flush the piping...
Hopefully this will fix you up...

Heatman101

Yes - This is an easy (though not widely known) diy fix! Remove the cover of the faucet handle (may pop off if crystal type or use a screwdriver to remove the screws) inside there is a scald guard safety mechanism - using a flathead screwdriver, turn the guard some the left. There should be a guide so that you do not turn the water up too hot. If there is not, you may need to consult a plumber or supplier in order to adjust the hot to a moderate temperature.

Hope this helps! ;)

Not sure where to find the diagram, but what type of faucet is it and where is it leaking? It it's a single lever, remove the hot/cold indicator to uncover an allen set screw. Loosen it and remove the lever, then the outer bushing nut. Now you'll have access to the interior parts around the cartridge (make sure you turn the water off to the supply lines before proceeding further). If it's the two handle type, remove the index buttons from the top of each handle to uncover a screw with either a slotted or phillips head. Remove the screws and remove the handles. You now have access to the valves and seats. If it's a 12-year-old faucet, the o-rings and seats will probably need to be replaced and this will fix your problem. If it's a single lever type, you'll need to replace the seats and springs and it will probably solve the problem.