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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-17-2011, 07:11 AM
poolman poolman is online now
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DISA 0 Ring

Looks like someone has brought forth the answer to the 0 ring seal problem---and it's not from BMW--go figure
http://cgi.ebay.com/ebaymotors/BMW-E...Q5fAccessories
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  #2  
Old 01-17-2011, 07:15 AM
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doru doru is offline
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Great find Poolman.
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  #3  
Old 01-17-2011, 10:15 AM
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Graham E39 528i Graham E39 528i is offline
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Quote:
Originally Posted by poolman View Post
Looks like someone has brought forth the answer to the 0 ring seal problem---and it's not from BMW--go figure
http://cgi.ebay.com/ebaymotors/BMW-E...Q5fAccessories
You know Poolman, if you ever want to replace an OEM o-ring on your car with a better one, speced out by YOU. McMaster.com sell a complete line of SAE and metric o-rings (and in all materials).

For example, I already figured out which VANOS seals to buy from them (should Beisan Systems ever stop doing business).
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  #4  
Old 01-17-2011, 10:37 AM
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I never understood the DISA (never had to yet) but this is what we have in the bestlinks thread on the problem:
- DISA VALVE FLAP BREAKS: the DISA valve flap breaks, sometimes with parts sucked into the intake manifold (1) (2) (3) (4) (5) (6) (7) (8) & recommended parts (1) (2) & brand selection (1)

The DISA system is named rather confusingly in the E39 glossary as:
- DISA = Differential Air Intake Control (multiple definitions)
- DISA = intake runner length tuning mechanism (multiple definitions)

Googling, I find that a rattling tapping sound from the DISA valve can be easily diagnosed without the need for any special tools:
- BMW E39 E49 M54 Engine DISA valve rebuild

Further googling, I find a new DISA valve goes by a few names & often comes with the o-ring:
- Adjusting Unit with O-Ring for Intake Manifold (DISA Valve) ~$215
- Adjusting Unit for Intake Manifold (DISA Valve) ~$215

And that the o-ring can easily be replaced as a DIY (if you find the o-ring):
- BMW E39 530i DISA valve o-ring replacement

So, as with the lower radiator hose thermoswitch o-ring, the hard part is finding a supplier for that simple o-ring. Thanks Poolman for giving us this link. I'm going to add it to the bestlinks along with the thermoswitch o-ring.

Can someone get us the dimensions of this o-ring when they buy a new one?

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  #5  
Old 01-17-2011, 10:45 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by Graham E39 528i View Post
McMaster.com sell a complete line of SAE and metric o-rings (and in all materials)
To add value, I just updated the bestlinks line on DISA to the following (to include Poolman's new information):
- DISA VALVE FLAP BREAKS: the DISA valve flap breaks, sometimes with parts sucked into the intake manifold (1) (2) (3) (4) (5) (6) (7) (8) or the disa valve o-ring fails (1) (2) & where to get just the DISA valve o-ring (1)

What we need now is:
  • What size is the DISA valve o-ring?
  • What material is best for the DISA valve o-ring?

Last edited by bluebee; 01-17-2011 at 11:09 AM.
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  #6  
Old 01-17-2011, 10:58 AM
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Quote:
Originally Posted by bluebee View Post
I never understood the DISA (never had to yet)
This is the clearest explanation yet (if it's correct) of what the DISA valve purports to accomplish ...

Quote:
To be exact, the DISA valve does not change the length of the intake system on the six-cylinder engines from the M52TU onwards - its function is to be open at low speeds, so feeding all six intake pipes together.

At mid-range speeds it closes, seperating the front and rear groups of three cylinders from each other. At higher speeds it opens again, joining the cylinder groups together. It therefore acts like a massive balance pipe which can be closed when required.

The effect of this is to give more mid-range torque without interfering with bottpm and top-end torque.
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  #7  
Old 01-17-2011, 11:32 AM
pleiades pleiades is offline
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Is the DISA Valve O-ring unavailable for M54 engines or no longer available in general?

It's listed for M52TU engines as a $2.21 part on RealOEM (part # 11617504543).
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  #8  
Old 01-17-2011, 12:29 PM
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Quote:
Originally Posted by pleiades View Post
Is the DISA Valve O-ring unavailable for M54 engines or no longer available in general?
It looks like there is no part number for the M54 engine in Realoem.
But that doesn't mean there isn't a similar part that BMW sells that we just don't know the cross reference to.

For example, the #4 o-ring below is an exact replacement for the lower radiator hose thermoswitch o-ring (which itself doesn't have a part number).

Maybe we can find a similar o-ring in the BMW catalogue for this DISA valve (aka #7 Adjuster Unit).

Does anyone know the size of this DISA Adjuster Valve o-ring?

Here is the link on realoem for my M54 engine.

Realoem clearly lists two different o-rings:
# Description Supplement Qty From Up To Part Number Price Notes
04 O-ring 8X3 1 13621743299 $1.25
06 O-ring 7X3 6 11617502761 $0.88

But neither o-ring is for the DISA valve, per se:
# Description Supplement Qty From Up To Part Number Price Notes
07 Adjuster unit 1 11617544806 $212.50

Here is the complete listing from Realoem.
*******>********>
No.DescriptionSupplementQty From Up To Part NumberPriceNotes
01INTAKE MANIFOLD
1
09/200211617502268
+core, ENDED
01INTAKE MANIFOLD
1

11617525752$615.48
02Set of profile gaskets
1

11611436631$63.30
03Temperature sensor air
1

13621739510$25.98
04O-ring8X31

13621743299$1.25
05DISTRIBUTION PIECE
1

11611440318$58.23
06O-ring7X36

11617502761$0.88
07Adjuster unit
1
04/200411617502269
+core, ENDED
07Adjuster unit
1

11617544806$212.50
08T-SHAPE IDLE REGULATING VALVEBOSCH1

13411744713$211.28
09BRACKET IDLE ADJUSTER
1

11617502271$14.98
10Rubber grommet
1

11611437453$20.65
11Rubber Mounting
1

11611432564$7.60
12Torx-bolt with washerM6X184

11611440384$1.12
13Oval head screw
4
07/200611611705032
ENDED
13ScrewK60X224

11617533331$0.75
14Hex nut with plateAM79

07129902630
ENDED
15CapD=3,5MM2

11611437560$3.39
16Cap nutM61

12421438388$0.63
17CapD=7,0MM1

11611727176$3.39

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  #9  
Old 01-17-2011, 12:41 PM
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Graham E39 528i Graham E39 528i is offline
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This is what you do:
  • Get hold of the OEM o-ring
  • Measure the inside diameter (ID) & outside diameter (OD)
  • Try to establish whether the o-ring is SAE or metric
  • Match up the size with the sizes available on an engineering vendor site (like McMaster.com)
  • If you want to use a different size or material, now is the time to decide
  • Order the o-rings

Piece of cake!

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  #10  
Old 01-17-2011, 12:42 PM
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Quote:
Originally Posted by pleiades View Post
RealOEM (part # 11617504543).
Part 11617504543 (O-ring) was found on the following vehicles:
Strangely, Realoem doesn't list the size of this specific O-ring!

However, I wonder if the size of this P/N 11617504543 0-ring is similar to the o-ring for the M54 engine DISA gasket?

*******>********>
No.DescriptionSupplementQty From Up To Part NumberPriceNotes
01INTAKE MANIFOLD
109/1998
11611439965$615.48+core
02Set of profile gaskets
109/1998
11611436631$63.30
03Temperature sensor air
109/1998
13621739510$25.98
04O-ring8X3109/1998
13621743299$1.25
05DISTRIBUTION PIECE
110/1998
11611440318$58.23
06Adjuster unit
109/1998
11611440049$252.45
07T-SHAPE IDLE REGULATING VALVEBOSCH109/1998
13411744713$211.28
08Rubber Mounting
109/1998
11611432564$7.60
09BRACKET IDLE ADJUSTER
109/1998
11611432563$8.05
10Rubber grommet
109/1998
11611437453$20.65
11Torx-bolt with washerM6X18409/1998
11611440384$1.12
12Oval head screw
409/199807/200611611705032
ENDED
12ScrewK60X22409/1998
11617533331$0.75
13Hex nut with plateAM7909/1998
07129902630
ENDED
15Compression collar
109/1998
11611440050$6.73
17O-ring7X3609/1998
11617502761$0.88
18O-ring
109/1998
11617504543$2.21

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  #11  
Old 01-17-2011, 12:48 PM
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Quote:
Originally Posted by Graham E39 528i View Post
Get hold of the OEM o-ring
I would be glad to measure the o-ring, just as I did with the lower radiator hose thermoswitch o-ring as I reported over here...
- Please measure the thermoswitch O-ring size!

If I had the o-ring in hand.

Since I don't have a problem with my DISA valve, and since I don't have the o-ring in hand, I'm hoping someone ELSE will have the o-ring handy (perhaps saved after a DISA valve replacement).

If you have an E39 DISA Valve o-ring - please measure and report back!

Also, it would be interesting to find out what the dimensions of the known DISA valve PN 11617504543 o-rings are.

I find it odd that realoem does not list the size for 11617504543 when I looked just now (at only one model) as shown above.

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  #12  
Old 01-17-2011, 03:33 PM
poolman poolman is online now
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I'm thinking that this 0 ring on Ebay is for the m54 engines that didn't come with an 0 ring--I made a gasket to fit and works fine for me--just thought someone might not want the trouble to do that--hadn't thought about it but Fastenal sells all sorts of 0 rings and has them in stock--next time mines off the car I'm gonna check and see if they might have the size that will do the job and post that back here as well.
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  #13  
Old 01-17-2011, 04:40 PM
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champaign777 champaign777 is offline
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dealer DO NOT sell M54 o-rings for DISA ( had the same question recently )

This is a Great find Poolman !! Thanks for sharing !

I am going to order 2 right now

Last edited by champaign777; 02-25-2011 at 04:16 PM.
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  #14  
Old 01-19-2011, 02:07 AM
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Quote:
Originally Posted by champaign777 View Post
I am going to order 2 right now
When you get the O-ring, can you measure it for us?
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  #15  
Old 01-19-2011, 10:42 AM
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Or when you buy 2, just put one in an envelope and send it to bluebee. She will take a very very precise measurement :P Then she will send it back...I think...haha.
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  #16  
Old 02-18-2011, 12:48 AM
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Does anyone have a size for the M54 DISA o-ring yet?

Also, anyone with the older DISA o-ring that "can" be bought from BMW ... please measure that too!

Then, with both o-rings measured, we can tell if they're the same (or not).

More details here.

Last edited by bluebee; 02-18-2011 at 12:58 AM.
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  #17  
Old 02-18-2011, 08:40 AM
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Me and 2 other members from Bfc ordered those DISA O-rings from e-bay - the linky posted by Poolman. They never arrived (yet) but the wait time already passed 2 weeks. It seems it's a scam....
Just so you guys are aware. I will keep you posted if there are any changes.
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Old 02-18-2011, 09:10 AM
pleiades pleiades is offline
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Quote:
Originally Posted by doru View Post
Me and 2 other members from Bfc ordered those DISA O-rings from e-bay - the linky posted by Poolman. They never arrived (yet) but the wait time already passed 2 weeks. It seems it's a scam....
Just so you guys are aware. I will keep you posted if there are any changes.
I ordered a replacement O-ring for my M52TU DISA valve; $2.50 from Pelican with the part # cited in post #7. I'll measure it when it gets here in the next day or so.

Is the O-ring on M54 DISA units just an O-ring or more complicated? Has anyone measured that one?

Per the ebay seller, I enjoyed his responses to some of his negative feedback.
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Old 02-18-2011, 11:28 AM
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i have pushed this ebay seller and he finally ( after 2 weeks ) said the o-ring was send

will see soon
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  #20  
Old 02-18-2011, 11:51 AM
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Quote:
Originally Posted by doru View Post
Me and 2 other members from Bfc ordered those DISA O-rings from e-bay - the linky posted by Poolman. They never arrived (yet) but the wait time already passed 2 weeks. It seems it's a scam....
Just so you guys are aware. I will keep you posted if there are any changes.
Can you just stop by the dealer and buy it?
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Old 02-18-2011, 12:05 PM
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champaign777 champaign777 is offline
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so who is a scammer ? Poolman ??
guy also sent me the tracking number today

Last edited by champaign777; 02-25-2011 at 04:17 PM.
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  #22  
Old 02-18-2011, 12:43 PM
pleiades pleiades is offline
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Copying from my post in another thread...

OK, just got my $2.50 version from PelicanParts.com. It measures approx. 50 mm internal diameter (with me trying to get it to stay in a perfect circle) and is 3.2 mm thick, so about 56 mm OD, give or take a few tenths ...



..... And it's green .......
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  #23  
Old 02-18-2011, 01:07 PM
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Quote:
Originally Posted by Jason5driver View Post
Can you just stop by the dealer and buy it?
Apparently they were not available for the 530? Or maybe a different size for the M54 engine as opposed to the M52? Reference
(I did not bother to check thoroughly)
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  #24  
Old 02-18-2011, 01:17 PM
pleiades pleiades is offline
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Looks like that ebay guy is selling the same O ring for every DISA-equipped 6-cyl BMW on the market. Are they all red?
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  #25  
Old 02-18-2011, 05:47 PM
HanSolofliesBMW HanSolofliesBMW is offline
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1). I ordered 2 of the DISA o-rings from the link on eBay (above) back on 2/2/11...I plan on seeing if it will fit my 525 DISA.

2). I believe it will fit, very curious. Disappointed by JDM...but they did finally send me an email and let me know, "It's on the way."

3). I am VERY curious about part # above 11617504543 to see if it would fit...it SEEMS that inded it would as Realoem shows that 11617504543 fits:

Part 11617504543 (O-ring) was found on the following vehicles:

E39: Details on E39
E39 528i Touring
E39 528i Sedan

E46: Details on E46
E46 323Ci Coupe
E46 323Ci Convertible
E46 323i Touring
E46 323i Sedan
E46 328Ci Coupe
E46 328i Sedan

Z3: Details on Z3
Z3 Z3 2.5 Roadster
Z3 Z3 2.8 Roadster
Z3 Z3 2.8 Coupe


4). Star Wars is on Cartoon Channel tonight fyi.

Last edited by HanSolofliesBMW; 02-18-2011 at 06:08 PM.
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