Sink drain leak from overflow holes?

[kpottermn]

First time with a plumbing install so please be nice, just doing my best - and poorly, apparently.

Installed a Glacier Bay Dorset 8in widespread faucet + pop-up drain in this pre-assembled Allen and Roth sink/vanity combo from Lowes. There's a small dribble of water leaking out from between the bottom of the sink and the rubber stopper on the drain pipe.

I put teflon on the top of the drain pipe and plenty of silicone caulk to install the drain flange. If I put the stopper down it holds water just fine, so my best guess is that water is getting out through the overflow holes in the drain and seeping out.

Am I missing a step to seal the drain/sink assembly at the bottom, or do I need to get a different drain assembly?

Thanks. Photos attached.

 

[Plumber01]

The black rubber gasket on the bottom of the sink is upside down. The cone should be facing up into the sink. Flat side goes against the nut.

 

[Sponsor]

 

[kpottermn]

The black rubber gasket on the bottom of the sink is upside down. The cone should be facing up into the sink. Flat side goes against the nut.

Tried both, seemed to actually do better upside down as shown.

 

[Terry]

I squish Stainless Putty on the threads where the rubber washer sets. The water rolls down the threads otherwise.
With metal drains I sometimes use pipe dope on the threads. On plastic I use the Stainless Putty.
Block the path, block the water.

 

[hj]

we are telling you how it SHOULD be, you can do it however you want to.

 

[kpottermn]

we are telling you how it SHOULD be, you can do it however you want to.

I understand and appreciate that. I tried it how it should be twice initially and it performed measurably worse. By which I mean to say that the problem is beyond having the gasket upside down.

 

[MKS]

Nut tightened up well then?

 

[kpottermn]

Nut tightened up well then?

It's on there tight, yes. I'll try putty as mentioned above and see if that creates a better seal.

 

[Jadziedzic]

FWIW, I have an under-mount bathroom sink with a slight furrow in the material at the bottom of the drain opening; it also leaked a drip or two from above the drain washer. I eventually had to resort to a bit of silicone between the washer and the bottom of the sink to stop the leak. Next time you have the drain assembly removed look for any issues with the surface of the sink...

 

[Terry]

It's on there tight, yes. I'll try putty as mentioned above and see if that creates a better seal.

I don't put any putty on the rubber seal, only on the threads of the drain where it passes though the lav and where the rubber seal slides up and over.

 

[kpottermn]

I don't put any putty on the rubber seal, only on the threads of the drain where it passes though the lav and where the rubber seal slides up and over.

Please excuse the ignorance, but can you explain what you mean by "where it passes through the lav"? Sorry, I'm not up on plumbing lingo.

 

[Reach4]

I drew some green lines near the thread that passes through the lavatory. A lavatory usually refers to a bathroom sink.

 

[kpottermn]

I drew some green lines near the thread that passes through the lavatory. A lavatory usually refers to a bathroom sink.
View attachment 41958

Thank you. Problem is that's where the overflow drain holes are - won't that be an issue if I putty over them?

 

[Reach4]

Thank you. Problem is that's where the overflow drain holes are - won't that be an issue if I putty over them?

In that case, there are no threads at that point, right?

I am not a plumber.