Today today I am going to show you how to replace a stem unit and seats and springs in a Delta bathroom faucet like this one. So, let's get to it. It's pretty simple. All you want to do is unscrew the faucet handle, set that to the side. This allows you to gain access to the little set screw here that holds this handle in place. Using an Allen wrench to turn the screw to the left, set that to the side, use a pair of channel locks to unscrew this lock knot here that holds the stem unit in place.
The stem unit will come right out. Notice the orientation when you do that, because you want to install it right back in place the way that it was, either with a new unit or if you are only replacing the seat and the spring, you still want to replace this in the same exact position. There are little plastic tabs on the side here that go into grooves on the brass fitting. So we'll set that to the side. I will show you the seat and the spring that are down in there. So the seat is the little rubber piece here and the spring is this spring.
And they go together in a specific way. There is a wide portion to this spring, believe it not. It might be hard to see here, but that wide portion needs to go down into the faucet. So if you have a new seat and spring, I advise you to put them together before you stick them down into the faucet. So you put them together, grab them with your needle nose pliers, drop them down into the hole that sits in here, press down on it firmly, make sure that the seat is down in there. Position your stem unit the way that it was before you took it out.
Put the lock nut back on, hand tighten it, maybe give it an eight of a turn with the channel lock, put your handle back on, tighten it down with the Allen wrench, screw your portion of the handle in place and voila, you are done! So that's it, that's how you replace or fix a bathroom faucet by Delta. Hope this was helpful. So have a great day, take care!