Trying to tighten loose kitchen faucet

Question

The faucet rocks around a little on the countertop. I got a basin wrench and I cannot turn the nut. From the picture, does it look like the nut is corroded on? Is that a typical occurrence? Any suggestions?

Answer 1

Here are some random shots in the dark.

• That you cannot turn the nut, even to loosen it, does not help. Look through this site and do everything you can to free the nut. If you can't do that, you may be able to carefully saw off the nut and rescue the faucet with a replacement nut, or to destroy the faucet and replace it. There's really no hope of reducing play if you can't move the nut.
• Some Delta faucets like yours require an optional spacer between the nut and the U-shaped metal gasket. If the counter is too thin the nut bottoms out. Maybe (and I emphasize this is a shot in the dark) your installation requires a spacer but it was not installed.
• Some Delta faucets are secured by two screws from the top and then the faucet body is secured from on top. I don't think yours is one of these (you would see the ends of the screws underneath) but you would need the model and manual to be sure.
• Maybe the metal gasket having one of its fingers over the undermounted sink flange is a problem? Probably not the problem but I would try anyway to turn it so it's entirely in contact with the counter. But first you need to be able to move the nut!