Original Delta Single Handle Lavatory Sink Faucet Repair
The instructions to repair an original Delta single handle lavatory faucet are simple and
straightforward. Replacing all the internal parts of the old style Delta sink faucet at the same time will
minimize the chance of recurrent problems. Original Delta faucet repair parts and kits are readily available
at almost hardware stores and home centers. Online faucet part retailers also offer a good source of quality
Delta parts, often at discounted rates. If you order your parts online, look for retailers that offer free
1. Turn the water off under the sink. You should see two small silver shut-off valves connected
to the faucets water supply lines under the sink. Turn the faucet on halfway in-between hot and cold. Turn
the valve handles clockwise until the water stops flowing.
2. Remove the single lever handle. Under the handle, you will generally see a red and
blue button. Carefully remove the button by hand or with a plastic card; like a credit card. You will need a
1/8-inch Allen wrench to loosen the handle’s setscrew. Turn it to the left a couple of rounds, just enough to
loosen the handle and pull it off.
3. Unscrew the bonnet cap. Under the handle, you will see a dome shaped cap that holds the
interworking of the faucet together. Unscrew the cap by hand if you can. If not, use a strap wrench. Do not
use sharp edged tools to remove the cap you will damage the finish.
4. Pull out the ball assembly by the stem. It should pull out easily.
5. Remove the Delta seats and springs under the ball assembly with a pair of needle-nose
6. Clean the inside of the faucet. If you see a white or green mineral buildup inside the
faucet’s body, use a small piece of emery cloth to remove as much of the sediment as you can. Place a hand
towel behind the faucet and turn the cold-water shut-off valve on-- just enough to wash out any debris, and
then turn it back off.
7. Install the new Delta seats and springs. Slide the small open end of the rubber seat onto the
Allen wrench, followed by the small end of a spring. Insert the end of the Allen wrench into one of the
supply ports inside the faucet. Work the spring and seat into place with a finger. Repeat this step for the
second faucet supply port.
8. Set the ball assembly in place. Line up the guide slot on the ball with the guide tick on the
faucet body. Place the small open end of the bonnet cap loosely on your index finger. With your other hand,
slide the cam packing over the ball. Line up the cam guide with notch in the top of the faucet. Hold the cam
in place with your index finger and let the bonnet slide down onto the faucet. With the other hand, start
screwing the bonnet cap on the faucet.
9. Screw on the bonnet cap by hand, and then secure with a strap wrench.
Turn the water back on.
Fine-tune the adjustment ring. Use the needle-nose pliers to turn the Delta bonnet adjustment
ring. Spread the pliers open just enough to fit the slots of the ring and then turn it left to loosen and
right to tighten. This will adjust the tension on the faucet lever. You want the handle to turn freely
without falling down and shutting off by its self.
Replace the handle and tighten the setscrew. You may need to try a couple of times to get it
set just right.