A two-handle Delta bathroom faucet started leaking from the spigot recently. Rather than calling a plumber and spending triple digits for a simple repair, I decided to tackle it myself. I first did some research on the Internet and concluded that the mostly likely solution is to replace the seat and spring in the affected handle unit assembly. Apparently these will start failing with repeated use.
I didn’t find a good online step-by-step guide for fixing two-handle Delta faucet leaks so I decided to document my repair. It only took me about 15 minutes to do the repair.
Before tackling this repair, you’ll need an adjustable wrench (or gripping pliers), a small screwdriver, a set of hex wrenches, and a replacement set of seats and springs.
Tip: Take photos of the faucet assembly as you take it apart so you remember how it all fits back together.
1) First determine if the leak is in one handle unit or both. You can so this by alternatively shutting off the hot and cold water supply beneath the sink. In my case, the dripping stopped when I turned off the hot water supply so I knew this handle unit was affected.
2) Turn off the water source at the affected handle unit. Obviously very important if you don’t want to get wet!
3) Close the sink stopper and cover sink with towel. Before you take anything apart, close the sink stopper and/or cover the sink with a bath towel so that any little pieces do not fall down the drain.
4) Remove the handle. Unscrew the handle counterclockwise.
5) Remove the handle housing. Unscrew the set screw with a hex wrench. You’ll need to try several sizes to find a fit. Mine was 3/32″.
6) Remove 1/4 turn stop. Remove this small plastic piece by hand.
7) Remove bonnet nut. Use an adjustable wrench or pliers to unscrew the nut.
8.) Remove the stem unit assembly. Use your hand or pliers to pull this out.
9) Remove the seat and spring. Use a small screwdriver to lift out the black rubber seat and spring underneath. Note the orientation of the spring underneath the seat.
10) Replace the seat and spring. If the spring is not symmetrical, make sure it is oriented correctly. Carefully place the new seat and spring into the small hole.
11) Reassemble the faucet parts in reverse order.
Congratulations, you just saved the cost of a plumber’s house call.