Question about Harley Davidson XL Sportster 883 Motorcycles

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Pressure build up in oil reservior

What is the cause as the oil get pushed out passed the o-ring on the oil cap

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  • Harley Davidson Master
  • 3,506 Answers

Most likely too much oil in the system. Check it HOT and only have about half way between add and full. Definitely not more than the full mark.

Posted on Oct 16, 2014

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: oil cap popping off

The engine breather pipe is clogged ! clean it and the problem sloved!

Good luck.

Knight (Yamaha seca XJ750 A 1981)

Posted on Apr 17, 2009

  • 5 Answers

SOURCE: 1969 triumph trident bobber has to much oil

yes! sounds like exsesive crankcase pressure. time for a top end rebuild.

Posted on Apr 24, 2009

  • 12 Answers

SOURCE: engine flooding gas building exceessive pressure

Remove the fuel cap and try it. If the problem disappears, you need a new cap as the vent has become plugged up.

Posted on Mar 21, 2010

agent91
  • 2100 Answers

SOURCE: replacing gas cap caused pressure build up in tank

The tank has to be vented, you have a drain line on the overflow that allows air to come in, but it still has to go out, there is usually a tiny hole in the cap somewhere, He may have clogged some of the lines to the tank with the sealant, what did he use?? Most tanks have a map pasted on them where all the lines go, Find one and see what is missing or wrong, if you have to seal the tank, get it off, dry it out, wash it soap and water, get some POR brand tank sealer, works great, and pour it in there , follow their instructions, hope this helps.

Posted on Apr 24, 2010

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1 Answer

200L Skyline. Why is it still smoking?


If all the plugs are getting wet are you sure you have the right rings And installed correctly, have you changed the PCV valve. A bad PCV will cause a build up of pressure and may cause you to pass through the rings. Good Luck

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How can I stop oil from coming from my dipstick?


Depends on the cause.
Blow-by is when oil blows by the rings in the cylinders into the combustion chambers or compression blows by the rings into the crankcase. It can also be caused when too much pressure builds up in the crankcase because of a venting problem.
So blow-by can cause smoke out the tailpipe from oil burning with gasoline, or oil collecting in the air cleaner, or blowing out a seal or other place like your dipstick tube.
If it is caused by worn piston rings, the rings have to be replaced.
If it is a venting problem, you need to open up the vent, like the PCV valve or the air intake port.
If you remove the cap where you add oil and there is a vacuum when the engine is running, the venting system is working. If oil blows out the hole, there is too much pressure in the crankcase.

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1 Answer

Pressure build up in oil reservior.


Most likley abswer is to much oil in the system. Try running it halfway between add and full and check it when it is HOT

May 07, 2014 | Harley Davidson XLH Sportster 883...

1 Answer

Why does oil pressure build up in oil reservior


Check for a pinched/blocked vent line.
Possible bad piston rings and over pressurizing the crank case (compression blow-by).
Overfilling the oil tank. Check with engine hot.
Also, it could be just a aged/dried up/ cracked o-ring.

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you may have broken piston rings and your sump is being pressurized and blowing the oil out

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Pressure is building up under valve cover. its pushing oil out. when opening oil cap lots of air comes out


either oil ports are clogged not allowing drainage? or compression is bypassing the rings placing it in the crankcase assy area, Meaning worn cylender or cracked ring most likely

Jun 09, 2010 | 1996 Volvo 960

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Whaen car idles its fine but when driving it sputters an when it builds boost it blows the intake pipe off the throttle body an oil comes out of the throttle body


in your car the air ventilation system is freeze up causing a build up of pressure which caused the oil to burst out. there is the mosture sludge build up under the oil fill cap . its advisable to clean everything up and then check out by starting the car. also spray crab cleaner in the throttle body and check out. as per me the problem is causing because of :-- I guess the breather vent tube was full of oil - frozen in there somehow. Must have to do with that sludge buildup on my oil fill cap. This is the one coming off the front on the left side of the oil filter. It goes down under the engine. This blockage caused a pressure buildup in the crankcase which caused oil to blow by the pistons and into the combustion chamber and out into the air intake hose and throttle body. get the spark plugs removed and cleaned up all the oil. The reason it sputter is because of all the oil in the combustion chamber. No air could get in. get the oil change and insulate the breather pipe in case of future freeze ups. This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya

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1 Answer

Pressure inside oil tankl


All air compressor will build pressure in the oil reservoir. This is caused by blow-by past the piston rings. The reason all compressors have this is due to the relatively slow rpm that the compressor crank is turning. Unlike a car's engine that is turning so fast the compressed gas doesn't have time to leak by the rings.
To deal with this problem air compressors have a special oil fill cap that alows the pressurized air to be vented out of the oil reservoir chamber.

There are three reasons that you are having this problem. The first is you have a clocked oil cap vent. Second is you have the wrong type of oil cap.
The third is the bad one. If the problem is unrelated to the oil cap then it means there is more blow-by then the vent cap can handle. This would indicate that you have worn or broken rings and/or worn cylinder wall.

If your compressor is not old (low hours), then take a close look at the cap. If it has more then 2000 hours then you will most likely need to rebuild the compressor, depending on the make and model.
Hope this helps and good luck.


Dec 12, 2009 | Air Tools & Compressors

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Craftman 3gal/1hp air compressor runs normal, but


Chek for pressure BEFORE REGULATOR,if the problem remains worn rings or valve seats most likely source of trouble.

Aug 09, 2009 | Air Tools & Compressors

1 Answer

Oil blowing out of the fill cap


u need to verify the Positive Crankcase Ventilation system is functional, if not u have this crankcase pressure problem.

Feb 09, 2009 | 1994 Volvo 850

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