Oil Filler Cap R11000RT

[cptss67]

Odd filler cap, just plastic and O-rings (almost always had threaded metal with rubber gasket). It was suggested that I take out the insert and clean it and cap, which I did.
The whole setup does NOT seem to allow any way to make the seal a close and tight fit. I am getting some oil blowback; seepage around the filler cap and drizzles on the cylinder head.
I am pretty sure NO oil should leak or seep out around the filler cap.

What's up with mine"?

[glennhendricks]

I'm not sure what you mean. Did you remove the fixture from the cylinder head?

I haven't had any trouble with mine. Is the blowby from the filler cap itself? Might need to replace the o-ring

[PGlaves]

There are two O rings. One between the plastic ring and the valve cover, and the one on the filler cap itself. Carefully lever out the black ring and replace that O ring - along with the one on the filler cap and you should be good for another 25,000 miles or so.

[rdsmith3]

The neck itself has an O ring underneath. You can usually pry out the plastic neck with your finger, without removing the valve cover.

I periodically replace all four pieces -- cap, neck, and two O rings -- because it is a poor design and it eventually leaks. The sum of the four parts is cheap by BMW standards, at about $5.

[sriverag]

I have the same problem with my oil cap (R1150RT 2002). After a trip to Daytona and when refilling the oil in a gas station, it started to leak. I tried to rotate the cap but I had the same results. I may have lost one of the O rings since I don't remember having two O rings but just the one on the cap.
I'll check again and will buy the one missing or will replace the 4 items in order to be sure.
Cheers!:thumb

[JimMoore]

You have to pry the plastic insert out of the valve cover to see the lower o-ring. I'm willing to bet that it is your problem. You need a new one.

[cptss67]

Thanks for the input. I'll get the replacement parts needed.