How to Fix a Leaking Delta Single Handle Kitchen Faucet

Delta faucets are some of the best and long-lasting faucets in the market. That notwithstanding, they will leak from time especially in areas with hard water but debris can also play part in it.

So, why is your Delta kitchen faucet leaking and what can you do to fix it? Well, the solution to that will depend on where you are seeing the leak.


A leaking Delta kitchen faucet is caused by worn out seats and springs, O-rings, Cam or the ball assemblies. Although you can fix the leak by only replacing the worn out part, buying a complete kit and replacing all the parts is a sure way to solve the problem and keep it that way for a long time.

If your Delta kitchen faucet is leaking from the spout/aerator, the faucet springs and seats are faulty. Replacing both seats and faucets is a sure way to stop the leak.

When your Delta kitchen faucet is leaking from the base of the spout, it is a sign that the O-rings are not sealing properly therefore causing leaks as the water goes up the spout. Replacing the O-rings will fix the problem.

If your Delta kitchen faucet is leaking from under the handle, you have a problem with the Cam and ball assemblies. To fix the problem, replace the Cam and ball assemblies but you can replace the seats and springs as well.

Over the time, I have found out that buying a Delta kitchen faucet complete repair kit is the best option to deal with leaky faucets. By replacing all the parts, you will have the peace of mind that you will not need to fix the faucet again for a few years.

The good thing is that Delta faucets have a lifetime warranty so all you need to do is pick the phone and contact them. If you qualify for the warranty they will send you a replacement kit free of charge.

If you decide to buy your own replacement kit, I recommend that you buy original parts by Delta. There are third party parts in the market but are not as good as the original ones. Check out this replacement kit on Amazon.

Delta Single Handle Kitchen Faucet

How to Fix a Leaking Delta Single Handle Kitchen Faucet

For this repair you will need the following parts:

  • Replacement kit
  • 1/8-inch hex wrench
  • Plumber’s grease
  • Adjustable wrench/pliers
  • Flathead screwdriver
  • Wd-40 (optional)

When you have gathered all the items together, this is how to proceed:

1. Turn off Water to the Faucet

You cannot repair the faucet with water still flowing to it. Duck under the kitchen sink to turn off water to the faucet.

  • You will see 2 oval-shaped knobs connected to 2 hoses. The 2 knobs are the cold and hot water shut off valves. To turn off cold and hot water to the faucet, turn the shut off valves clockwise.
  • Turn on the faucet to drain out the water already in the hoses.
  • Once the water is drained out, plug off the kitchen sink drain. You do not water to lose any part to the drain.

2. Remove the Faucet Handle and Spout

  • The faucet handle is connected to the valve using a hex screw. Turn the handle to the open position to reveal the screw underneath it. Remove the hex screw using a 1/8-inch hex wrench.
  • Grab the handle and try to pull it out as you wiggle it at the same time.
  • The handle could however be corroded and therefore not come off easily. In that case, spray some WD-40 to dissolve the corrosion and try again after 15 minutes.
  • Remove the cap assembly. This is the ‘nut’ which holds the spout in place. Grab it with a wrench or pliers and gently turn it counterclockwise. You can wrap tape around it to avoid scratching it with the wrench.
  • Grab the spout and pull it out as wiggle it as well to detach it from the O-rings.

3. Remove the Cam, Ball Assembly, O-rings, Seats and Springs

  • Use a flathead screwdriver to pry off the Cam assembly. This is the black rubber piece at the top of the valve.
  • Lift off the ball assembly. Whenever you have a leak from underneath the faucet handle, most often it is caused by dents on the ball assembly. Run you finger gently on the ball assembly look for any signs of rough edges.
  • With the Cam and ball assemblies out, you can now clearly see the faucet seats and springs. These are usually the culprits any time your Delta kitchen faucet is leaking from the spout.
  • Use a flathead screwdriver with a narrow head to remove both sets of seats and springs.
  • Remove the O-rings with the same screwdriver. When these O-rings are worn out, your faucet will leak from the base of the spout.

One thing you will notice after removing these parts is that the valve body is likely to be badly corroded both inside and out. Take you time to scrape off the corrosions before replacing the faucet parts.

4. Install the New Faucet Parts

  • Start with the O-rings. Slide in both the upper and bottom O-rings into their grooves (start with the bottom one). Do not use any tool to force them down the valve to avoid pinching them.
  • Once the O-rings are sitting nicely in their grooves, apply a generous amount of grease all around them.
  • Install the faucet springs and seats. You need to be very careful here. If you look at the springs, you will notice that they have a wider and a narrow side.
  • The wide side is the one which goes inside the valve while the narrow side is connected to the seat. Slide in the springs inside the seats.
  • Use a 1/4-inch flathead screwdriver to direct the seat and springs assembly inside the valve. Once inside, remove the screwdriver and use your finger to press down on the assembly.
  • As a confirmation that the seat and springs are properly installed, you should hear a click. Do the same for the other set of seat and spring.
  • Apply some grease on both seats.
  • Slide in the ball assembly. Do not forget to grease the ball as well but most importantly, make sure that the slot on the ball coincides with the nub inside the valve . This is very important to make sure you ball is engaged to the valve.
  • Push in the Cam assembly. Again, make sure that the notch on the Cam assembly coincides with the notch on the valve body.

5. Install the Spout and Handle

  • Clean the inside of the faucet spout to remove all mineral deposits and debris.
  • Apply grease inside it especially where the O-rings will sit.
  • Put the O-ring on top of the spout and apply grease on top of it as well.
  • Slide in the spout and screw in the cap assembly. Tighten it gently with a wrench.
  • Install the handle. Slide in the handle and secure it with the hex wrench. I like to apply some grease on the hex screw as well.

While doing this repair, it is always a good idea to remove and clean the faucet aerator from the spout to improve the faucet’s water pressure. More on that in this post.

6. Test the Faucet

Turn on water at the shut off valves and open the faucet. Check for leaks when the faucet is running and when the faucet is turned off. If you did everything right as outlined in this post, you will notice that the leak will have disappeared.

To see all the above steps, watch the video below.

And basically that is how to fix a leaking Delta single handle kitchen faucet. I hope this guide was helpful.

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