I have a sink in the second flr kitchen that makes a really loud gurgley drip sound when water drops into it. On top of that, when you let the water out of it, unless you do it really slowly, the water backs up into the adjacent bathtub in the next room. We're replacing the tub and the wall is open so I can see the plumbing. I'd like to get the problem fixed while the wall is open. The pipe from the sink leaves the trap and then is pitched quite aggressively down where it runs into a "T" with a vent pipe on top and the bottom half continues, takes a sleight turn and pitches down again. Here it connects to a "Y". One end of the "Y" leads to the trap and then trip waste of the tub, the other goes in a pipe underneath the bathroom floor that doesn't seem to have a visible pitch at all and connects I assume with the toilet and eventually the main stack.
Any suggestions on keeping the dirty sink water from backing up into the tub without having to tear up the bathroom floor?

 

juliuspetty, Welcome to the DIY Forums.
It sounds like the vent is the problem. If the vent is plugged or non-existant, the water gurgles because it need air to drain. If there is no air available it will suck the water out of the closest trap to get it. You may have a partially clogged drain also. If there is a clog after the tub drain, then the water rushing from the sink backs up and looks for a place to go....TUB. You may want to try an Enzyme drain cleaner such as Draincare. Enzyme cleaners cling to the partial clog and "eats" them. Caustic drain cleaners knock a hole in the clog and then run down the pipes and allow a foundation for future clogs. Draincare is available at Home Centers, Hardwares and even Walmart. About $8 and may take more than one treatment (lots of treatments in one jug). Good luck.

 

Thanks Majakdragon,
I thought it might be a venting problem. I'll see about trying to get the vent cleared if it's partially obstructed and I'll look for that Draicare or another enzyme drain cleaner.
Thanks Again