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How does the crankcase breather work and what does it do?

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A crankcase ventilation system is a one way passage for gases to escape in a controlled manner from the crakcase of an internal combustion engine.
This is necessary because internal combustion inevitably involves a small but continual amount of blow-by, which occurs when some of the gases from the combustion leak past the piston rings (that is, blow by them) to end up inside the crankcase, causing pressure to build up in the crank case. For control of the pressure inside it, a PCV is used to vent the crank case.

For full details, check this link:
Crankcase ventilation system

Posted on Nov 21, 2014

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Posted on Jan 02, 2017

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SOURCE: crankcase breather

If the bike sits for a while, and then you run it and shut it off, it will drip.. run it more often.

Posted on Apr 28, 2010

wd4ity
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SOURCE: 89 Harley FLTCU oil coming from the crankcase breather tube and

This is an age old problem for the Harley engine. In you 89 model, the crankcase breaths from behind the oil pump through a tube that runs to the backside of the air filter assembly. Most people that I know, simply remove the tube coming up to the air filter and block the hole in the air filter assembly backing plate. At the breather, they run a short hose to just behind the transmission and cut it off there. This is similar to the earlier Shovelhead engine and the way it breathes. In 1994, Harley went to the "head breather system" which was better but it still gets oil into the air filter assembly.

There is one thing I saw on the aftermarket assessories market once called a "CatchCan". The breather tube ran to it and it seperated the oil from the air and the held it in a small container to be emptied on a regular basis. I have never used one nor have I ever seen one so all I can tell you is what the book said. Matter of fact, I cannot remember where I saw it now. Custom Chorme catalog, maybe. Good Luck, Steve

Posted on Apr 30, 2010

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Where is crankcase breath in pulsar 150. And how it works


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crankcases breath through a PCV valve attached to the inlet manifold as a requirement by pollution laws . Look for a hose attached to the rocker cover with a non-return valve in line ending at the inlet manifold.

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My Gravely 2011 0 turn model number 915146has a briggs and stratton engine smokes like it is burning oil. I change the oil religiously with good 30 weight oil.


in dusty conditions the crankcase breather will clog , in which the crankcase builds excess causing oil to be forced by the rings.
clean the crankcase breather.

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Oil is coming out of the air beather


This is a common problem. Now the heading says your bike is a 1979 Sportster. Regardless of what it is, there is a crankcase breather that is routed to your air cleaner. This was done to satisfy the EPA regulation that crankcase fumes must be run through the engine to be burned. With the crankcase air come a mist of oil. This oil builds up in the air breather and runs out. You have to clean the air filter out periodically. You can find the crankcase breather hose and re-route it somewhere else so the oil won't go into the air filter.

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Oil cap and dipstick covered in creamy sludge, is this breather prob as not losing any water


Yes, it could be that a plugged up Positive Crankcase Ventilation (PCV) valve or engine crankcase breather (with filter) is the cause allowing moisture to condense in the crankcase. However, if the valve and breather are okay, a cylinder compression test should be done to verify that the cylinder head gasket is not leaking. Regardless, the engine oil should be drained and the engine flushed with clean oil and an appropriate crankcase flush additive. Entrained water in the oil (the creamy sludge) will damage engine bearings quickly.

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I have changed pcv valve twice and still getting oil in breather


The PCV valve does not control the oil situation, it just keeps the pans and valve covers from blowing off during a backfire. Excessive Oil in the breather is a result of excessive crankcase pressures, usually due to a worn engine, specifically rings.
SOME oil is normal, especially if you are loaded heavily and hard on the throttle.
There is a tester that measures crankcase pressures, but usually some other manifestation shows, like excessive oil consumption.

the PCV system draws crankcase fumes into the intake at idle and lower throttle situations. air going into the crankcase is filtered by the small PCV filter, where the oil shows up....

At highter throttle and lower intake manifold pressures, the system reverses, the PCV valve closes, and the fumes exit the crankcase VIA the breather filter. All of this is normal.

It costs tons less to periodically clean or replace the PCV filter.

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Oil is getting on air breather 2004 ram hemi


Hi,
oil getting on a breather can indicate excessive crankcase pressure. Check all the `crankcase breathers and the valve cover breathers.

if the crankcase has been overfilled with engine oil. The crankshaft has to "beat" it's way through the oil and thus acts as a pump and sends oil all over the internal surfaces of the crankcase.

If the engine cylinders have developed 'blow-by" they will also contribute to an increase in crankcase pressure which will be evident by oil in the breathers. The fumes / pressure in the crankcase are designed to be removed by the engine breather system, and drawn through the engine etc.

I hope this info helps.

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If the bike sits for a while, and then you run it and shut it off, it will drip.. run it more often.

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Start with making sure your oil lever is not over full. If it is it may be getting into the crankcase breather hose that goes to the carburetor hence the white smoke. Sometimes also you can blow a gasket in the breather system and it will do the same. Check for oil leaks in the breather system. Hope this helps. donnyb60

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