Can anyone please tell me where this o-ring goes? I cannot tell from the exploded view diagram. It is part of the E39 540i/6 Crankcase-Ventilation/Oil Separator.
I looked at the OEMbimmerparts diagram as well, and it gave no hint of where it goes, except that it was next to the pipe that goes to the back of the manifold.
When I copied the part nbr you listed...then opened up my browser and went to realoem.com...then pasted the part nbr into the part nbr application search box...then got the list of BMWs that use that O-ring...I then clicked on the e39 (other BMW models showed up in the search)...and clicked on the first diagram...this is what I found (#8 in the diagram):
If this is the part you're asking about...just follow the "lines" in the illustration to see where it goes. You can also look at the connecting "brackets" in the illustration which indicates a part that also includes the other items in the illustration. If a part (like #7 in the diagram above) has another item included in a bracket...it means if you purchase #7, item #8 is included. But if the item (#8 in this instance) also has its own line item in the part nbr index below the diagram...it means that it can be purchased SEPARATELY (as well) from item #7.
Sine O-ring (#8) is connected to item #4 in the diagram...I would say that it is located either internally in #7...or it meets up with O-ring #5 as item #7 & #4 are hooked together.
In this diagram below ...I have no clue as to why the O-ring (#6) doesn't have any indication of where it goes. :dunno:
QSilver7-------------Thank you very much for all of your work. Ours is the post-98 model, with the mystery location of the #6 o-ring. However, you have answered my question, because I didn't realize that all of the parts in a bracketed item were included. We just finished the Valley Pan and the Coolant System Jobs, and we were concerned about the dreaded "part leftover," but we had actually ordered that part separately in addition to buying the pipe. So thanks again, and thank you to everyone for helping!!
I've puzzled over the same thing, having recently done the valley pan, cooling system, valve covers and vent pipe connecting the oil separator to CCV.
Check out the descriptions on the post 9/98 Realoem page, there are:
#3 - two 17x2,65 o-rings. One fits inside a groove in the oil separator, the other on the end of the pipe which goes into the separator. I can't recall whether the o-rings end up adjacent to each other or if there is a shoulder in the separator/vent pipe opening.
#7 - is a 20,0x3,55 which fits over the nipple on the CCV and pushes out against the large end of the pipe.
#6 is a 16x3,55. It can't fit in any of the aforementioned places. I originally installed it as a "crush" washer inside the large end of the pipe pushing against the CCV nipple. After completing the job, one of the $%#*%$ knock sensors decided it was no longer going to work. So I pulled the IM, replaced both knock sensors, and took #6 out thinking it was a duplicate. (before I had noticed the size difference in the specifications)
Now I'm battling an intermittent P0170 code, only in cold weather. I did not get this code after the initial repair, but I only drove about 50 miles and may not have completed sufficient drive cycles to trigger it. This P0170 code could very well be unrelated to the mysterious #6, but after I get my DIY smoke tester built (thanks Bluebee!), if I don't find avisible vacuum leak I'm going to go back in through the CCV and re-install #6, and will report back.
I just did some more research----
On the AutohausAZ site, if you bring up Part #5 on the diagram, which is the Vent pipe/Oil separator to rear cover, it says "Also need one each of oring seals, 11151747978 and 11151736140. 1 per car."
For O-ring #6, pn 11151747978, it is called the "O-ring for intake manifold vent pipe at oil separator."
For O-ring #7, pn 11151736140, it is called the "O-ring for rear intake manifold cover."
So I think that the #6 gasket goes to the oil separator at the same location as the oring #3 in the diagram, but I don't understand the two #3 orings, unless perhaps they are on the oil separator. Aaaaaarghhhh!!!
It wouldn't be the first time that there was a mistake in the illustration. I do question why there are two #3 O-rings in that diagram that would be right next to each other when the parts are assembled. And when you look at the non VANOS M62 diagram...there are two O-rings as well...but one is the same as our "mysterious" #6...and the other is the smaller O-ring like #3 in the diagram for your car.
I can answer as to why are there two #3's. Refer to post 9/98 illustration.
One goes in a the groove on the pipe, and seals to the inside of the oil separator.
You will never see the other one unless you hunt for it. There is a groove on the inside of the top part of the oil separator where the vent pipe inserts. The old o-ring will stay in that groove unless you remove it with a pick. It seals to the outside of the vent pipe.
The easiest way to see this little booger is to hook your butt up to an engine hoist, raise yourself to the top of your open hood, then rotate headfirst and downward until your head is on the valley pan. Can't miss it in this position!
I, too, am hoping that the illustration is not correct. I would gladly throw the #6 I purchased in the trash. But there is that troubling reality of a separate part number and a distinctly unique size...
Hey JVCDFW, do you have a photo of you on the engine hoist? (sorry, couldn't resist!!!)
The other O-rings make sense....just the #6 is still a big question mark... I just sent an email to Pelican for this O-ring....they have a "Do you have a question about this part?" link. I put in a link to this forum. Maybe they will be able to shed some light on this mystery.
We need to take our intake manifold back off tomorrow, so we will be looking at that as well....Man, do I miss driving the 540!!!
Rick pulled the pipe today----the mystery o-ring is inside!! The pipe consists of 2 pieces--the metal pipe, and the plastic section that compresses. The plastic section goes into the metal section a couple inches, and the metal tube is flanged, where the mystery o-ring would be inside sealing against the plastic pipe. Yippeeee!!!!!
This is my first attempt at the photo attachment---I hope it works.
So one would only need to order this o-ring if they were going to r&r the tube, but not if it will be replaced. :dunno:
Here is the other end of the pipe:
There is one oring shown here, and the other one is in the oil separator.
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