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What happens when an oil separator goes bad?

An oil separator is a critical component in various industrial and automotive systems, responsible for removing oil and other contaminants from the airflow. When an oil separator goes bad, it can lead to a range of issues that can have significant consequences. In this article, we'll explore what happens when an oil separator malfunctions and the steps you can take to address the problem.


Symptoms of a Failing Oil Separator


When an oil separator starts to fail, you may notice several telltale signs, including:



  • Increased oil consumption: If the oil separator is not effectively removing oil from the airflow, you may notice an increase in oil consumption, which can lead to more frequent oil changes and higher maintenance costs.

  • Reduced engine performance: A malfunctioning oil separator can allow oil and other contaminants to enter the engine, leading to reduced engine efficiency and power output.

  • Excessive smoke or emissions: If the oil separator is not functioning correctly, it may allow oil and other contaminants to be expelled through the exhaust system, resulting in increased smoke or emissions.

  • Clogged air filters: Over time, a failing oil separator can cause the air filters to become clogged with oil and other debris, reducing airflow and causing the engine to work harder.


If you notice any of these symptoms, it's essential to have the oil separator inspected and repaired or replaced as soon as possible to prevent further damage to your system.


Causes of Oil Separator Failure


There are several common reasons why an oil separator may fail, including:



  • Wear and tear: Over time, the components of the oil separator, such as the filter or the separator itself, can become worn or damaged, reducing their effectiveness.

  • Lack of maintenance: Failing to regularly clean or replace the oil separator can lead to a buildup of contaminants, which can impair its performance.

  • Excessive oil or contaminants: If the system is producing more oil or contaminants than the separator can handle, it may become overwhelmed and fail prematurely.

  • Mechanical issues: Problems with the compressor, engine, or other components that feed into the oil separator can also cause it to malfunction.


Addressing the underlying cause of the oil separator failure is crucial to preventing future problems and ensuring the long-term reliability of your system.


Repairing or Replacing the Oil Separator


If you suspect that your oil separator is failing, the first step is to have it inspected by a qualified technician. They can diagnose the problem and determine whether the separator can be repaired or if it needs to be replaced. In some cases, a simple cleaning or filter replacement may be all that's required to restore the separator's functionality. However, in more severe cases, the entire unit may need to be replaced.


When replacing an oil separator, it's essential to choose a high-quality, compatible unit that is designed for your specific system. Attempting to use an incompatible or lower-quality separator can lead to further problems and may even cause additional damage to your equipment.


By addressing oil separator issues promptly and using the right replacement parts, you can help ensure the continued smooth operation of your system and avoid costly downtime or repairs in the future.

What causes oil separator to leak?


Over time, however, an oil separator gasket can wear out, crack, or break due to exposure to heat, vibration, and corrosion. When this happens, it can cause oil leaks, poor engine performance, and increased emissions.



When should I replace my oil separator?


4 Signs You Need To Replace Your Oil Separator

  1. Increased Oil Content in Discharged Water. If the discharged water from your separator has an increased oil content, this may be a sign that the separator is no longer working effectively.
  2. Frequent Clogs.
  3. Leaking or Damage.
  4. Corrosion or Rust.



What happens if an oil separator fails?


When the oil separator system fails, it may fail to remove all the moisture from the oil returned to the oil pan. That moisture can gather under your oil cap, leaving a thick sludge behind. If you notice this sludge when you check the cap, it's time to immediately get to a service center.



How to check oil separator?


Signs of a Bad Air Oil Separator

  1. Visible Oil Leaks: Although less frequent, you may observe seepage or leaks near the air oil separator unit.
  2. Increased Pressure Drop: A sudden drop in pressure across the separator could be caused by a clogged filter element.



Can you drive with a bad oil separator?


Trouble with your oil separator might also lead to oil caking around the different parts of your engine. These parts include the cylinder heads, cylinder walls, and piston rings This buildup can be dangerous for your engine and can result in a loss in engine performance if left unchecked.



Can a bad oil separator cause a misfire?


A malfunctioning AOS might not separate the oil from the air efficiently, leading to decreased engine performance. You may experience rough idling, misfires, or even reduced power.



What are the symptoms of a bad AOS?


Poor Engine Performance: AOS failure can compromise engine performance, leading to rough idling, hesitation during acceleration, or a noticeable decrease in power output. These symptoms often stem from oil contamination within the intake system, disrupting the air-fuel mixture and combustion process.



How do you service an oil water separator?


Oil Water Separator Maintenance

  1. Turn off the influent water to the unit.
  2. Open the unit cover.
  3. Remove any oil and dispose of it in a way that complies with company and legal procedures.
  4. Drain the water from the separator.
  5. Measure the depth of the leftover solids and write it down.
  6. If necessary, dispose of the solids.



How do you know if your oil separator is bad?


When the oil/ air separator is bad, you will see milky/ oily substance in the air cleaner. Remove the oil separator from the engine block and check the drain back hole to see if it is restricted. If the drain is restricted, clean it out, clean both hoses out and change the engine oil.



What is the life expectancy of an oil water separator?


The life span of the oil separator is about 3500-5200h. But there are many factors that will influence its life span.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.