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High Pressure And High Temperature Flexible Rubber Air Breather Hoses. Part Type: Air Hose. Range of Size: ￠2～￠50 mm. Material Conformation: NBR+PVC.

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People also ask

Why would oil come out of a breather tube?

Oil coming out of your breather pipe is typically caused by excessive crankcase pressure from issues like overfilling the oil, worn piston rings, or a blocked or failed PCV valve. A small amount of oil can be normal, but significant amounts indicate a problem that needs attention to prevent damage.

Common causes and solutions

Overfilling the engine with oil:
This is the most common cause. Excess oil gets pushed out of the breather by the moving pistons.

Solution: Drain the excess oil until the level is correct according to the dipstick.
Worn piston rings or cylinders:
Worn rings don't seal properly, allowing combustion pressure (blow-by) to enter the crankcase and force oil out.

Solution: This requires engine repair, such as a cylinder hone and new piston rings. A compression test can help diagnose this.
Clogged or faulty PCV valve:
The Positive Crankcase Ventilation valve is designed to relieve crankcase pressure. If it's clogged or stuck closed, pressure builds up.

Solution: Clean or replace the PCV valve. You can test it by removing it and shaking it to see if the ball/valve moves freely. It should only allow air to pass through one way.
Excessive blow-by:
A general term for combustion gasses pushing past the piston rings, causing high crankcase pressure.

Solution: This is often a symptom of worn rings and requires engine repair.
Other potential issues:
Hard riding: Aggressive driving can increase oil mist in the crankcase, which can lead to more oil dripping from the breather.

Fuel contamination: Fuel can mix with the oil, making it more volatile and leading to more vapors.

Turbocharger issues: In turbocharged engines, a failing turbo can allow exhaust gas to enter the crankcase, forcing oil out.

Clogged oil screens: Debris can clog oil screens, leading to oil blow-by.

Valve issues: Leaking intake valves can contribute to oil being drawn into the crankcase.

Overheating: Extreme engine temperatures can cause oil to evaporate and smoke, which then condenses and drips out of the breather pipe.

What to do next

Check the oil level:
The simplest solution is often the right one. Make sure you haven't overfilled the engine with oil, says this YouTube video and this Quora post.
Check the PCV valve:
Locate the PCV valve and test it to see if it's functioning correctly.
Have a compression test performed:
If the oil level is correct and the PCV valve is good, a compression test can reveal worn piston rings.
Inspect for other leaks:
If the pressure is high, oil may also leak from other gaskets and seals, so inspect the engine for additional signs of leaks.

Oil coming out of the Breather hose | Access Norton Motorcycle Forums
Aug 19, 2012 — 1. The motion of the pistons must inevitably tend to pressurise the crankcase. 2. There is SUPPOSED to be air (and pos...
Access Norton Motorcycle Forums

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Jul 10, 2020 — * Is the sump overfull? You can use the dipstick to check this :-). * Is the oil on the dipstick unusually runny if o...
Quora

Why is oil coming out of my breather? - Quora
Oct 19, 2019 — * oil leaking out of the crankcase vent is an indication of excessive crankcase pressure. * Assuming the engine was a...
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Oct 13, 2024 — case i'm unclear how much wear or hours you have on this engine to rule out the possibility of intake valve issues or ...
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Jun 18, 2024 — Re: Oil coming out of the breather ! ... On starting the bike there is oil coming out of the breather , my mechanic ha...
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What causes access oil coming out from the breather pipe in a diesel ...
Apr 29, 2021 — Don't ignore an oil leak- especially if the source if exhaust. ... After overhauling my engine, it started to leak oil...
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What causes engine oil to come out of the breather of a diesel engine?
Sep 20, 2023 — This would increase pressure within the crankcase chamber thus ejecting oil via the breather. Alternatively, could be ...
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How to prevent oil leakage from breather - Quora
Jan 29, 2016 — Why is oil coming out of my breather? One of two problems. The first is very simple. the PCV valve may be clogged or s...
Quora

OK IHAVE AN OIL LEAK, ITS coming from the crankcase breather / blow by. i have 425, 000 mile on the engine. i have been
Dec 1, 2010
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Sep 14, 2023
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Jun 20, 2025 — I need some help I put new gaskets and new piston rings and honed the cylinder and it still throws oil out of that tub...
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The hoses on top of the valve covers seem to be leaking slightly. Do I just put clamps on them? New owner, not used to these old engines.
May 8, 2025 — It's normal. The one on the driver's side is the PCV, or “positive crankcase ventilation” valve. They keep pressure low...
Facebook

What could be causing oil in the intercooler piping of my Audi TTS after replacing the turbo?
Jul 16, 2025 — Jordan Bowman did you recently put any oil in the car? If you overfill it will do this as well.. my car smoked like cr...
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Jeep Wranglers - Oil leaking from engine cover bolt hole?
Aug 29, 2025 — If it was squirting out the hole as you say, you've got pressure building inside the engine forcing the oil out which ...
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AI responses may include mistakes. Learn more

Oil coming out of the Breather hose | Access Norton Motorcycle Forums

Aug 19, 2012 — 1. The motion of the pistons must inevitably tend to pressurise the crankcase. 2. There is SUPPOSED to be air (and pos...

Access Norton Motorcycle Forums

How to Fix Oil Leaks: Crankcase Breather Edition

May 8, 2019 — uh came out to it it was parked came outside and it was just there was oil all over the ground there was a 5 foot wide ...

YouTube ·

TJ BRUTAL CUSTOMS

oil coming out of the breather pipe..

Aug 28, 2021

The Nuffield Tractor Forum

Crankcase Breather Hose Oil Leak

Oct 21, 2024 — 4 LHDTE four-cylinder inline marine diesel engine it's a turbocharge unit as you can see i'm just about to get the air...

YouTube ·

White Hat Marine Surveying

How to stop the oil coming out of my valve cover breather - Quora

Jul 10, 2020 — * Is the sump overfull? You can use the dipstick to check this :-). * Is the oil on the dipstick unusually runny if o...

Quora

Why is oil coming out of my breather? - Quora

Oct 19, 2019 — * oil leaking out of the crankcase vent is an indication of excessive crankcase pressure. * Assuming the engine was a...

Quora

Motorcycle Tech: Does Blowing Oil Out the Breather Call for a Cylinder ...

Oct 13, 2024 — case i'm unclear how much wear or hours you have on this engine to rule out the possibility of intake valve issues or ...

YouTube ·

Motorcycle Tech and Travel

Oil coming out of the breather !

Jun 18, 2024 — Re: Oil coming out of the breather ! ... On starting the bike there is oil coming out of the breather , my mechanic ha...

Unofficial Royal Enfield Community Forum - Index

What causes access oil coming out from the breather pipe in a diesel ...

Apr 29, 2021 — Don't ignore an oil leak- especially if the source if exhaust. ... After overhauling my engine, it started to leak oil...

Quora

What causes engine oil to come out of the breather of a diesel engine?

Sep 20, 2023 — This would increase pressure within the crankcase chamber thus ejecting oil via the breather. Alternatively, could be ...

Quora

How to prevent oil leakage from breather - Quora

Jan 29, 2016 — Why is oil coming out of my breather? One of two problems. The first is very simple. the PCV valve may be clogged or s...

Quora

OK IHAVE AN OIL LEAK, ITS coming from the crankcase breather / blow by. i have 425, 000 mile on the engine. i have been

Dec 1, 2010

JustAnswer

Oil Dripping from the Breather Tube

Sep 14, 2023

Vintage Honda Twins

Why is the dipstick spitting out 15w30 engine oil in a 4jj3 engine?

Jun 20, 2025 — I need some help I put new gaskets and new piston rings and honed the cylinder and it still throws oil out of that tub...

Facebook

The hoses on top of the valve covers seem to be leaking slightly. Do I just put clamps on them? New owner, not used to these old engines.

May 8, 2025 — It's normal. The one on the driver's side is the PCV, or “positive crankcase ventilation” valve. They keep pressure low...

Facebook

What could be causing oil in the intercooler piping of my Audi TTS after replacing the turbo?

Jul 16, 2025 — Jordan Bowman did you recently put any oil in the car? If you overfill it will do this as well.. my car smoked like cr...

Facebook

Jeep Wranglers - Oil leaking from engine cover bolt hole?

Aug 29, 2025 — If it was squirting out the hole as you say, you've got pressure building inside the engine forcing the oil out which ...

Facebook

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HPS Performance Red 3-ply Reinforced Silicone Breather ...

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Breather tube education

Van's Air Force

https://vansairforce.net › ... › Main › General Discussion

Van's Air Force

https://vansairforce.net › ... › Main › General Discussion

Feb 25, 2012 — Standard dogma is that the exit end of the breather should be in a location such that there is no negative or positive pressure relative to the case pressure.

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Jan 3, 2019 — As long as the pressure in the case is equal or higher than ambient, or the pressure at the end of the breather, it'll flow out. But as one ...