How to Stop Oil Coming Out of Valve Cover Breather: Tips and Tricks

Oil coming out of a valve cover breather can be a frustrating problem for many car owners. This issue can cause oil to leak into the engine and other components, leading to potential damage and safety hazards. Fortunately, there are several steps that drivers can take to prevent oil from coming out of the valve cover breather.

One of the most common causes of oil coming out of the valve cover breather is an overfilled engine oil level. When the oil level is too high, it can cause pressure to build up in the engine, leading to oil leaks and other issues. Checking and adjusting the engine oil level can help prevent this problem.

Another potential cause of oil coming out of the valve cover breather is a clogged breather filter. Over time, dirt and debris can accumulate in the filter, preventing proper ventilation and causing pressure to build up in the engine. Replacing the breather filter can help prevent oil leaks and ensure proper engine function.

Causes of Oil Coming Out of Valve Cover Breather

Oil coming out of the valve cover breather can be a common issue among car owners. There are several reasons why this may happen. Here are some of the most common causes:

Worn Valve Seals

Worn valve seals can cause oil to leak into the combustion chamber and out of the valve cover breather. This is because the valve seals are responsible for controlling the amount of oil that enters the combustion chamber. When they wear out, they can no longer do their job effectively, leading to oil leaks.

Clogged PCV Valve

A clogged PCV (positive crankcase ventilation) valve can also cause oil to come out of the valve cover breather. The PCV valve is responsible for regulating the pressure inside the engine crankcase. When it becomes clogged, the pressure can build up, causing oil to leak out of the valve cover breather.

Overfilled Engine Oil

Overfilling the engine oil can also cause oil to come out of the valve cover breather. When there is too much oil in the engine, it can create excess pressure, leading to oil leaks.

Damaged Piston Rings

Damaged piston rings can also cause oil leaks. Piston rings are responsible for sealing the combustion chamber and preventing oil from entering it. When they become damaged or worn out, they can no longer do their job effectively, leading to oil leaks.

In conclusion, there are several reasons why oil may come out of the valve cover breather. These include worn valve seals, a clogged PCV valve, overfilled engine oil, and damaged piston rings. By identifying the cause of the issue, car owners can take the necessary steps to fix it and prevent further damage to their vehicle.

How to Stop Oil Coming Out of Valve Cover Breather

Replace Worn Valve Seals

One of the most common reasons for oil coming out of the valve cover breather is worn valve seals. Valve seals are responsible for preventing oil from entering the combustion chamber. When they wear out, oil can seep into the combustion chamber and cause it to burn. To fix this issue, the worn valve seals need to be replaced.

Clean or Replace PCV Valve

The Positive Crankcase Ventilation (PCV) valve is responsible for regulating the flow of air and oil vapors from the crankcase to the intake manifold. If the PCV valve is clogged or damaged, it can cause oil to come out of the valve cover breather. To fix this issue, the PCV valve needs to be cleaned or replaced.

Drain Excess Engine Oil

If the engine oil level is too high, it can cause oil to come out of the valve cover breather. This is because the excess oil has nowhere else to go but out of the breather. To fix this issue, the excess engine oil needs to be drained.

Replace Damaged Piston Rings

Damaged piston rings can cause oil to enter the combustion chamber and burn, resulting in oil coming out of the valve cover breather. To fix this issue, the damaged piston rings need to be replaced.

By following these steps, one can effectively stop oil from coming out of the valve cover breather.

Preventive Measures

Preventive measures can help reduce the chances of oil coming out of the valve cover breather. Here are some of the measures that can be taken:

Regular Oil Changes

Regular oil changes are important to keep the engine running smoothly. Fresh oil can help reduce the buildup of sludge and other contaminants that can clog the breather. It is recommended to change the engine oil every 5,000 to 7,500 miles, depending on the manufacturer’s guidelines.

Replace Air Filter Regularly

The air filter is responsible for filtering out dirt and debris from the air that enters the engine. A dirty air filter can reduce the airflow to the engine, causing it to work harder and produce more pressure, which can force oil out of the breather. It is recommended to replace the air filter every 12,000 to 15,000 miles, depending on the manufacturer’s guidelines.

Check Engine Oil Level Regularly

Checking the engine oil level regularly can help prevent overfilling, which can cause oil to come out of the breather. It is recommended to check the oil level every time you fill up with gas, or at least once a month.

Avoid Overfilling Engine Oil

Overfilling the engine with oil can cause the oil to foam up and create pressure, which can force oil out of the breather. It is important to follow the manufacturer’s guidelines for the correct oil level.

By following these preventive measures, you can reduce the chances of oil coming out of the valve cover breather.

Frequently Asked Questions

Why is oil coming out of my breather pipe?

Oil can come out of the breather pipe due to excessive crankcase pressure or a blocked crankcase breather. The pressure can build up due to various reasons such as worn piston rings, damaged valve seals, or clogged PCV valve.

How do I fix excessive crankcase pressure?

To fix excessive crankcase pressure, you need to identify the root cause of the problem. If it is due to worn piston rings, you may need to replace them. If it is due to damaged valve seals, you may need to replace them as well. Additionally, you can check the PCV valve and replace it if it is clogged.

What causes oil to come out through the breather?

Oil can come out through the breather due to excessive crankcase pressure or a blocked crankcase breather. The pressure can build up due to various reasons such as worn piston rings, damaged valve seals, or clogged PCV valve.

What are the symptoms of a blocked crankcase breather?

The symptoms of a blocked crankcase breather include excessive oil consumption, oil leaks, blue smoke from the exhaust, and decreased engine performance.

How can I prevent oil blowing out of the valve cover?

To prevent oil blowing out of the valve cover, you can ensure that the PCV valve is functioning properly and not clogged. Additionally, you can replace the valve cover gasket if it is worn out or damaged.

What is the best way to stop oil coming out of the crankcase breather on a motorcycle?

The best way to stop oil coming out of the crankcase breather on a motorcycle is to ensure that the PCV valve is functioning properly and not clogged. Additionally, you can replace the valve cover gasket if it is worn out or damaged.