If you look at the previous conversation you will see that all the referenced numbers (except those you are looking for) contain 11 digits. Below I have included a link to a site that discusses the BMW part numbering system. This site says that 39 is not used as a main group number, so please check with your mechanic.

The numbers he gave may have been for PVC valves (volume control valves according to BMW), but may not have been BMW parts.

Hope this helps, Jim
Hi Ekkehart,

Here is the conversation we had earlier on the board about PCV Valves (Positive Crankcase Ventilation valves).

Any help?
Dave from Seattle/Tacoma

>>>>>

Subject title: Does the 1988 750iL have PCV Valves?

Hi folks,

I have been hearing several different stories about the PCV valves.

From my local dealer I hear there is no PCV valves on a 1988 750iL.
Then I hear the car has volume control valves that plug into the air intake just to the inside of the air mass flow sensor. They have a little ball inside and if they become plugged you simply remove them, clean them in solvent, and put them back on the car.
Then I hear the car has check valves (pcv) and also volume control valves.
Then I hear the oil separator replaces the need for PCV Valves.

So, does the car have PCV Valves that function like a Ford or GM? Can someone explain how the crankcase is ventilated?

I welcome your comments,
Dave

==========
David:

Yes their is something similar to a pvc valve on
the 750's, in fact two. I don't know what BMW's
name is for them, but I believe they serve the same purpose.

They are located under the eml motors on the front
end of the intakes. You will see a hose going to
the valve cover and one going to the hose from the
air cleaner to the eml's.

One test to make sure they are working is to take
off the oil filler cap and see if there is a vacuum, which I am told their should, per a BMW
mechanic. There are four valves total in the system, and replacement cost is about $100 for the
parts. Or you could try cleaning them with solvent. I believe the eml's have to be taken off
to get to the valves, however I have not done this
myself, but will in the next few months.

Good Luck
BobbyG

=========
You should replace the rubber grommets that seat the valves to the valve covers as they are probably very brittle. You will need the following:

1ea 11151718642 valve for cyl\7-12 side $30.75
1ea 11151718713 valve for cyl\1-6 side $30.75
2ea 11151715844 gasket (called adaptors) $2.25
2ea 11611708475 gaskets for throttle mtr $2.10
2ea 11151720131 check valve $11.41

All of the prices are each and BMW list prices. Euarasian was much cheaper. The throttle motor gaskets are cheap insurance to have on in case you damage them when removing throttle motors. You might also consider replacing the 2 air boots for about $21 each. If they are original they will be very brittle.

Morty

==========
I should hope so- I recently paid about $AU200 to have them replaced on my dealer's advice. So if my 750iL does not actually have them, I have just been ripped off!

Let us know what you find out.

Peter E32 750iL
Brisbane

========
Here is the part numbers I was given for the PCV Valves - could some one look these parts up please?

39-111-709-29 and 39-111-700-24 and was told retail is $37.44 each.

Funny how three days prior to this when I was changing my oil there was so much vacuum in the crankcase I broke my oil filler cap getting it off. Then I go through emissions and fail at idle pass at a high rev. Then two BMW repair shops say every things is working fine when it was there and then another repair shop said that my PCV Valves are clogged and they have contaminated the mass air flow sensor that according to BMW is self cleaning. Which still did not lean the engine out at idle.

Man I hate it when I hear three different stories and pay over $2,000 to the best one.

Dave

========
Here in Australia the part number on my docket is:
11151720131 (at about $AU 35 each).

Peer
E32 750iL
Brisbane