Question about 2011 Harley Davidson FLHR Road King

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CRANKCASE PRESSURE IS THIS NORMAL - 2011 Harley Davidson FLHR Road King

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Hi Anonymous, not really it means your engine isn't breathing or venting properly. Take a ride over to your local dealer or reputable shop for some feedback. Good luck

Posted on May 02, 2015

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Posted on Jan 02, 2017

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Usually indicates that water is leaking past piston seals into oil of crankcase.
Remove oil plug and check for gray foamy oil in crankcase. If oil looks normal (compare to motor oil) oil may be entering pump chamber (not very likely due to high pressure, generally water will be forced into crankcase). If foamy oil is found, time for reseal kit or replace complete pump.

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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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This issue is caused by crankcase pressure issue.
Normally filtered air enters the engine, runs through the crank case and then is pulled into the intake through the PCV valve. Durning hard acceleration, the PCV valve closes (to prevent explosion of fumes in crank case and blowing valve covers and pan off) and the PCV system reverses, with fumes coming back through the filtered intake.

Usually there is minimal oil that gets back into the air cleaner.

So, when somthing goes wrong, like excessive blow by, for example, the crankcase pressure overcomes the PCV valve and intake of fumes capability, and oily starts showing up in the air filter.

Investigate the crankcase pressure and PCV system.

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My pump has pressure in the crankcase.


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Oil in air box


Yep, its somewhat normal. Your crankcase ventilation tube connects to the back of the airbox. There is a small foam to dampen the airflow and remove the droplets from the flow - but other than that the crankcase is connected to the airbox. Now the good question is that what amount is normal, i.e. under what conditions there may be excessive amounts of oil generating so much positive pressure to crankcase that the oil becomes clearly visible in airbox... one reason may be too high oil level to start with ? Other reasons may relate to some kind of piston blowby - like rings glued into the piston? Also it is sometimes possible that PAIR lets air to move back to the airbox - but have not seen that happening in a busa, just in a car. In that case rather than oil its black carbon residue which feels a bit oil'ish. You can test the crancase pressure by removing the hose from the back of the airbox and feel the pressure when engine is running. It should not be blowing air out - but some pressure, or more like pulses will be felt. (Its so long time when I have last done this test, so maybe someone could describe this better...) Anyway this reminded me about the fact that in cars there is often a PCV valve, positive crankcase ventilation valve. I am just wondering why we dont have that in busa ? The performance related desire to have negative crankcase pressure surely is not the reason...

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Oil in air box


Yep, its somewhat normal. Your crankcase ventilation tube connects to the back of the airbox. There is a small foam to dampen the airflow and remove the droplets from the flow - but other than that the crankcase is connected to the airbox. Now the good question is that what amount is normal, i.e. under what conditions there may be excessive amounts of oil generating so much positive pressure to crankcase that the oil becomes clearly visible in airbox... one reason may be too high oil level to start with ? Other reasons may relate to some kind of piston blowby - like rings glued into the piston? Also it is sometimes possible that PAIR lets air to move back to the airbox - but have not seen that happening in a busa, just in a car. In that case rather than oil its black carbon residue which feels a bit oil'ish. You can test the crancase pressure by removing the hose from the back of the airbox and feel the pressure when engine is running. It should not be blowing air out - but some pressure, or more like pulses will be felt. (Its so long time when I have last done this test, so maybe someone could describe this better...) Anyway this reminded me about the fact that in cars there is often a PCV valve, positive crankcase ventilation valve. I am just wondering why we dont have that in busa ? The performance related desire to have negative crankcase pressure surely is not the reason...

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