What To Do If Pressure Washer Pump Oil Milky In 2021?

So, you notice that the water pump oil milky. But, what does this mean? And should you be worried about it?

Well yes, if the oil in the pressure washer is milky, it means that the oil is contaminated. Hence, it means you haven’t put proper maintenance behind your pressure washer well enough.

But, why does this happen?

At times, water can enter while you’re using the washer. Also, oil seals can leak water from the cylinder. As a result, this water can make the oil milky.

pressure washer pump oil milky

So, what should you do if pressure washer pump oil milky?

Well, you’ll need to identify the part of the pressure washer pump leaking oil and seal it. Don’t worry, it’s not that hard. In fact, we’ve compiled simple methods and their steps by which you can easily fix this issue.

Moreover, we’ve even discussed broadly why this problem takes place. You’ll also know the maintenance of the pressure washer from this article.

That being said, let’s begin.

What Are The Reasons For Milky Oil in a Pressure Washer?

By now, you’ll already know that water contributes to making pressure washer pump oil milky. But, how does water even enter into the pressure washer? And, are there other reasons too?

Well yes, almost 70% of the time, its water that’s entering and making the oil turn milky. But, there are other reasons as well that contribute to this issue. So, let’s check those out:

●    Worn Out Oil Seals

If the oil seals aren’t tight enough, they’ll leak water into the washer. Especially when you’re using the washer, water can easily enter through. As a result, this water gets mixed with the oil inside and turns the oil milky.

On the other hand, water can also enter if the drain plug, site glass, and fill cap aren’t tight enough as well. So, you’ll need to identify where the water is entering or leaking.

●    Excess Humidity

Yes, weather plays a part in getting water inside the pump oil. But, how does it happen?

Well, in places that have humid environments, condensation can happen. This causes water to enter into the oil of the pump. But, it only happens if the pressure washer remains idle for a long time.

Turns out, this condensation doesn’t create any issue if you’re using the pressure washer. So, if you’re using it continuously, the humid environment won’t have any effect on it.

●    Crack in Plungers

If you have any crack in your plungers, it can cause water to enter the oil as well. Worn out seals and cracked plungers are two main reasons why water can enter into the oil of the pump.

●    Emulsification

Normally, emulsification is letting off the water trapped in the oil. And yes, this water causes the oil to be milky. But, why does emulsification take place?

Well, it’s a natural cause. If you live in a cold environment, the water gets trapped inside the oil. As a result, when you start using your pressure washer again, the water comes out. Hence, it creates milky oil.

Turns out, if you don’t use your pressure washer for a long time in winter, this can also happen. This is mainly because of the water trapped inside the oil.

The Fixes

By now, you’ll know the reasons why the oil pump turns milky. But wait, don’t get tensed if you see the oil milky in your pressure washer. I mean, it’s not the end of the world, is it?

In fact, we’re here for you. And we’ve compiled some easy fixes that you can follow. Besides, if you can follow the steps correctly, you can fix this issue in no time. That being said, let’s begin:


Yes, you’ll require a set of tools for this. But, don’t worry as all of these tools are affordable and available. So, you can purchase them online or from the local shops without spending much. Let’s take a look at them:

After you’re done managing the tools and making all the preparations needed, let’s look at the process:

Method 1: Replacing the Worn out Oil Seals

Normally it’s the worn-out oil seals that contribute water entering. This water enters into the pressure washer. But, it’s easy to replace or fix them. In fact, the repairs don’t even cost that much. So, you won’t have to break the bank in the process.

Also, by fixing the oil seals, you’ll also fix the pressure washer pump leaking oil. So, let’s look at the step-step process:

Step 1: Purchase an Oil Seal Kit

It’s essential to get an oil seal kit for the damaged seals. So, firstly buy an oil seal from any local shop. Also, the oil seal will depend on your washer pump. So, keep in mind what model you have.

Normally, common washer pumps are Dewalt 4200, Honda GX 390. If you know your water pump, you can easily buy the correct oil seal for it. After you purchase the oil seal kit, replace it with the oil and water kit seal.

If your old oil seal is made of rubber, you can easily remove them. You can normally pull them out.

Step 2: Change the Worn Out Seal

An oil seal can be worn out at any time. It’s taken as one of the most common issues with washer pumps. However, once a seal gets worn out, it’s essential to replace it.

Apart from this, the seals can also expand and contract due to the effect of weather. So, always keep an eye out for that.

After you remove the worn-out seal from the pressure washer, replace it with the new seal in the same place. Also, make sure it correctly fits in place.

Step 3: Place the Right Seal

A right seal can ensure that no oil or water can leak into or out of the pressure washer. So, always use the right seal into the washer pump. Don’t put too much pressure to push the seal in its place.

Method 2: Pressure Washer Repair

If you don’t want to replace the old seals, you can also make repairs inside the pressure washer. Even though the process might take some time, it’s still simple. Also, if you can follow the steps correctly, you can do it in no time.

So, let’s look at the step-step process:

Step 1: Take off the Exterior of the Washer

Firstly, take a wrench and loosen up every bolt outside the exterior. By doing this, you can take off the exterior of the washer. But, make sure you don’t lose the bolts. So, keep them in a bowl.

Step 2: Remove the Allen Socket

When you remove the exterior, you’ll see the inside of the pump. If you see oil on the surface, remove the Allen socket to get inside the pump case. So, take the wrench and loosen the socket.

Step 3: Remove the Valve Inside

Removing the pump case, you’ll see the valve inside. Take a scissor and pull the valve out. But, be careful to not damage it.

Step 4: Split the Case

To go on the oil side of the pump, split the case in two. Using a hammer, you can do it. But, make sure you’re not damaging the case.

Step 5: Apply Re-Seal in the Oil Ring

After you split the case in two, you’ll see the oil ring. Here, the oil ring is leaking out oil and water. So, apply re-seal on the oil ring to seal it up.

Step 6: Add Oil

After you’re done, add in oil to the pump. Also, make sure that the pump is in an upright position before adding oil.

But, do you need a torque wrench to change oil?

No, you don’t need to change any oil here. You can just add fresh oil from the container. Following this, make sure that the oil is on the right level.

Step 7: Reattach Everything & Clean Oil

Lastly, you’ll need to reattach every bolt like before. By doing this, you’re securing the pump as it was before.

After this, take any roof cleaner and clean the oil that was lying around inside the pump. Wipe the cleaner off using a clean cloth.

Pressure Washer Pump Maintenance

If you can check the oil seals twice a year, it’ll be enough to maintain it. Also, if you can make sure that you’re having a look at the exterior and interior of the pump, it’ll be long-lasting.

Maintenance is the key to the lasting of a pressure washer. And yes, proper maintenance will mean that there will be no oil or water leaking from them. Let’s look at how you can maintain them:

  • Run the heat of the pressure washer to let the emulsified water come out of the oil.
  • Always change the pumping oil of the washer.
  • Drain the used oil from the washer.
  • Take the contaminants out of the pump 2-3 times a year.
  • Use cleaning fluids for the pressure washer.

Frequently Asked Questions

Why is my pressure washer leaking oil?

An oil seal inside your pressure washer might’ve been broken or worn out. This eventually leads to the leakage of oil.

What kind of oil does my pressure washer need?

Put non-detergent oil in the pressure washer pumps.

Wrapping Up

That’s all we got for you. By now, you’ll know what to do if pressure washer pump oil milky. You’ll even know why this problem exists.

In the end, we’d like to say that regular maintenance will never allow this problem to take place. So, always look out for oil or water leaks. The fixes that we taught you are simple and you won’t need a professional. However, if you’re not comfortable doing it yourself, you can always get help. Good

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