How to fix a leaking delta bathroom sink faucet fast!?

A leaking Delta bathroom sink is usually caused by worn-out faucets, seats and springs which fail to make a tight seal. It could also be due to a defective stem assembly (a double-handle faucet), worn out cam, packing, and ball assembly (a single-handle faucet); or a worn out washer and nut (a single-handle sink).

If your Delta bathroom sink is leaking from the fount spout, the fount seats and springs are worn. If it leaks from the bottom of the handle, you probably have a bad stem assembly. If it leaks from the top of the handle, you may have a defective ball assembly.

To fix a leaking toilet faucet, you’ll need to replace the seats, washers, and springs if the leak comes from the spout. If the leak is coming from the base of the valve stem, you will need to either replace the stem assembly (for double-handle faucets), or the packing and ball assembly (for single-handle faucets.)

How to Fix a Leaking Single-Handle Delta Bathroom Faucet?

Turn off Water to the Faucet

  • Underneath your bathroom sink, you’ll see two round knobs. They’re the valves that control the flow of both cold and hot water into your sink. Turn them counterclockwise to turn on water to the faucets.
  • Turn on the tap to drain the water already inside the hoses.
  • Put a plug in the sink drain.

Remove the Faucet Handle

Depending on the type you have, you’ll either have a knob-or lever-handle. Both of these handles attach to the faucet using screws.

  • If you have a knobby handle, pry off the cap at the front using either a sharp knife or flat head screwdriver. Remove the screw using the Phillips screwdriver and pull out its knob.
  • If you have a hex head screwdriver, you’ll use it to install the handle. The screw may also have a plastic cover. Remove the screw with an Allen key and remove the handle.
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Remove the Cam, Ball Assembly, Seat and Springs

  • Take off the adjusting ring. This is a thin piece of metal that holds all the faucet parts together. Use a needle-nose plier to unscrew it.
  • Screw off the top of the bottle using the wrench or channel lock. This is the part that holds the assembly together.
  • Remove the camera, packing and ball assembly from the rocket.
  • Use a towel to absorb any water inside the valve body before removing it from the shower. It makes it easy to remove the faucet parts from the sink.
  • Remove the seat and springs using a hex wrench or screwdriver. Put the screwdriver into the hole and turn it until it lifts the screws out.

Replace the Seats and Springs

Usually, the springs and seats of a leaking Delta bathroom fau­cet are the culprits. You can however decide whether to replace the camera, packing and ball assembly.

  • If you look at these two springs, you will see that they have a wide and a narrow part. It’s very important.
  • The wide side is where the valve goes into the body while the narrow side is attached to the seat.
  • Slide the spring into the seat and use a small screwdriver or hex wrench (or something similar) to push it through the valve stem.
  • Once inside the valve head, remove the old bolts and install the new ones. Make sure you hear a click when you plug them in.
  • Insert the ball assembly into the socket. It’s important to make sure that the slot on the ball matches up with the tab on the valve.
  • Put the cam in place, making sure to line up the notch on the cam with the one on the side of the cylinder head.
  • Screw the cap on. When you do this, push down on the lever and apply pressure to keep it from moving as you tighten the nut. Tighten the cap gently with the wrench.
  • Using a needle-nose plier, screw in the adjusting ring.
  • Screw the handle into place.

How to Fix a Leaking Delta Double-Handle Bathroom Faucet

A double-handle sink has two handles instead of just one. You need to figure which side of the tank has a leak.

If either side is causing the problem, I like replacing both sides. That makes me feel comfortable that the other side won’t start to leak any time soon.

If the faucets drip from the spout, you’ll need to replace its seats. If the faucets drip, replace the stem assembly. You can as well start from scratch if you haven’t done it for a long time.

Here’s how to repair a leaking toilet tank overflow

  • Turn off Water to the faucet. Again, you will do this from underneath the sink. Turn off the cold and hot water and shut off valves.
  • Open the faucet to drain out all the water in the hoses and plug off the drain to prevent dropping anything down the drain.
  • Take off the handles. Look for a hex nut underneath the handles. Remove it using a screwdriver. If you have knobs, remove the index cap to reveal a screw. Remove it using a Philips screwdriver.
  • Remove the retaining ring from the lens. This ring holds the handle assembly in place. Use a wrench or channel locks to loosen it.
  • Remove the stem assembly. Just grab it with your pliers and pull it off.
  • Remove the screws from the bolts. You can use the screwdriver to connect the narrow ends of the springs to the seat. Insert them into the valve and once in position, use the screwdriver to remove them. Press down on them until you hear a click.
  • Install the stem assembly onto the bike. You must be very careful here. There is a small hole on the stem assembly that needs to be aligned with a groove on the head valve body.
  • Screw in the ring until it’s tight enough using the wrench or channel lock.
  • Insert the handle.
  • Do the same for both sides of the faucet
  • Check if there’s any water leaking out from under the sink.
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And that is how you fix a leaking double-handle Delta bathroom faucet.


The most common cause of leaks are worn parts. The best way to avoid these problems is by regularly inspecting the faucet and changing the parts that wear out quickly.

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