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DISA 0 Ring

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#61 ·
Is this guy who is selling Oring on ebay trust worthy? I've ordered the oring on 14th may and mailed him 2 times but no response or oring yet. I even didn't get any confirmation or mail from him for delivery too. What you guys think of him?
 
#62 ·
bluebee said:
makes sense. There is no filter between the disa and the pistons.

Nobody answered the question about the cross section of the replacement o-rings.

I guess that it's just fine to replace a rectangular cross-section o-ring with a circular cross-section o-ring. Right?
Click to expand...
+1
 
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#63 ·
Nittenyadhav said:
Is this guy who is selling Oring on ebay trust worthy? I've ordered the oring on 14th may and mailed him 2 times but no response or oring yet. I even didn't get any confirmation or mail from him for delivery too. What you guys think of him?
Click to expand...
this guy needs some "kick off" but finally you will get it
 
#64 · (Edited)
silicone

champaign777 said:
i really don't care 7$ or 12$
yap, red one from ebay is the way to go , match perfect

silicon is a big NO NO, you don't want to see this staff in your cylinders, don't you ?
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do you know material from which your replacement O-RING is made?
and whats wrong with silicone? how should it get into cylinders?

Silicone is acceptable for temperature applications between -65 degrees F (-54 degrees C) to 450 degrees F (232 degrees C). It has good resistance to ozone, weather, detergent, salt water, engine and transmission oil, non-petroleum brake fluid, hydraulic fluids that resist fire, vegetable and animal oils, and high molecular weight chlorinated aromatic hydrocarbons.

Silicone is vulnerable to mechanical wear and tear, water and steam over 250 degrees F (121 degrees C), aromatic hydrocarbons (benzene), chlorinated hydrocarbons (trichloroethylene), acids and bases, and hydrocarbon fuels.
Click to expand...
 
Discussion starter · #66 ·
Vacuum from the engine would pull the silicone into the cylinders. Now if your smart and use sensor safe silicone there wouldn't be any problem. The only problem with small bits of silicone getting into the cylinders would be that once burned the stuff would contaminate your 02 sensors. The stuff is so sofet that there wouldn't a problem to the combustion chamber, unless your pour huge amounts in. For the amount thats going to be used to seal off the DISA valve, only small and I mean very small particles would be pulled into the engine. I don't see where this would cause any problems what so ever.
 
#67 ·
poolman said:
Vacuum from the engine would pull the silicone into the cylinders. Now if your smart and use sensor safe silicone there wouldn't be any problem. The only problem with small bits of silicone getting into the cylinders would be that once burned the stuff would contaminate your 02 sensors. The stuff is so sofet that there wouldn't a problem to the combustion chamber, unless your pour huge amounts in. For the amount thats going to be used to seal off the DISA valve, only small and I mean very small particles would be pulled into the engine. I don't see where this would cause any problems what so ever.
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can't believe you are talking serious about it.
I'm talking abut silicone o-ring, not silicone sealant!!!
 
#68 · (Edited)
Nittenyadhav said:
But how do I contact him? I sent 2 mails from ebay but no response. Is there any phone number where I can call him?
Click to expand...
tell him negative feedback is on the way , this will help

and for people who want to use silicon as poolman said should be no issue
damage, no damage , finally its your car and your decision and if it worth 10$ then go for it
 
#69 ·
Hi champain777

Thanks for your reply. I just mailed him again so hope he will get back to me soon. Thanks again.
 
#70 ·
poolman said:
if your smart and use sensor safe silicone there wouldn't be any problem
Click to expand...
Ooops. Because I'm debugging lean-mixture pcodes, today, at about 105K miles (2002 BMW 525i), I removed my DISA unit today for a quick look.

  1. SES: P1083,BMW 202, Fuel Control Limit Mixture Too Lean (Bank 1 Sensor 1)
  2. SES: P1085,BMW 203, Fuel Control Limit Mixture Too Lean (Bank 2 Sensor 1)
  3. SES: P0174,BMW 228, System Too Lean (Bank 2)
  4. PENDING: P0171,BMW 227, System Too Lean (Bank 1)
The DISA 'looked' OK. But now I had the problem of the o-ring seal.

Looking on my shelf, I found (and used) this stuff as the sealant.

Did I use the right or wrong stuff as a sealant?

Image
 
#71 ·
go get the o-ring


if you use the sealant that is not sensor safe, you will end up like this.

The picture shown here is a silicone contaminated oxygen sensor. A contaminated O2 sensor will give you lean fuel-air mixture and the car feels very sluggish. You might not get a code but you will get a bad gas mileage.
 

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#72 · (Edited)
chemgigi said:
if you use the sealant that is not sensor safe, you will end up like this
Click to expand...
It makes sense to buy the relatively cheap o-ring if you plan on removing the DISA, so as not to risk the expensive sensors.

The good news, for now, is this response from over here:
- E39 (1997 - 2003) > Car was throwing codes....DISA valve!

uncmozo said:
According to the Permatex Ultra Copper Technical Data Sheet, Ultra Copper IS sensor safe. You're fine.
Click to expand...
Permatex Ultra Copper Maximum Temperature RTV Silicone Gasket Maker

Image
 

Attachments

#73 · (Edited)
pleiades said:
Is the O-ring on M54 DISA units just an O-ring or more complicated? Has anyone measured that one?
Click to expand...
Technically, there is no O-Ring on the M54 DISA units... and that's why there is not one shown on the realoem diagrams. The sealing is done via a built-in "lip" on the base of the unit that mimics an o-ring. Yes, you can gouge out the old sealing to uncover the grove that a normal o-ring can be fitted into, but you have to wonder why BMW made it the way they did, why it's rectangular, and the original seal is moulded and "glued" into place.

Also, and a big assumption here - the reason the DISA units may not have a traditional o-ring fitted, is, what might happen when it wears, or is mis-fitted, and gets sucked down the intake manifold and into the motor? :yikes:

Putting an o-ring onto an old worn unit might be a bit of a risk perhaps.
 

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#74 · (Edited)
Bazza-Aus said:
The sealing is done via a built-in "lip" on the base of the unit that mimics an o-ring.
Click to expand...
Doru mentioned something similar in this thread:
- E39 (1997 - 2003) > Broken DISA Valve

doru said:
The seal is flush with the lips of the groove, having only a very small rib that will seat inside the receiving end - intake manifold, and that will produce the seal.
Click to expand...
I'm not sure what this 'lip' actually is & why it disappears on the old DISA.

Q1: Does this additional lip flatten right away when a new DISA is installed; or does it take time to flatten out to nothing?
Image

Image


Bazza-Aus said:
the original seal is moulded and "glued" into place.
Click to expand...
Doru said the same thing over here:
- E39 (1997 - 2003) > Broken DISA Valve

doru said:
Once the DISA is out, and in case it's still good (fat chance), the glued O-ring seal is certainly toast.
Click to expand...
Q2: What glue should we use when installing a new DISA?
 

Attachments

#77 · (Edited)
Bazza-Aus said:
Technically, there is no O-Ring on the M54 DISA units... and that's why there is not one shown on the realoem diagrams. The sealing is done via a built-in "lip" on the base of the unit that mimics an o-ring. Yes, you can gouge out the old sealing to uncover the grove that a normal o-ring can be fitted into, but you have to wonder why BMW made it the way they did, why it's rectangular, and the original seal is moulded and "glued" into place.

Also, and a big assumption here - the reason the DISA units may not have a traditional o-ring fitted, is, what might happen when it wears, or is mis-fitted, and gets sucked down the intake manifold and into the motor? :yikes:

Putting an o-ring onto an old worn unit might be a bit of a risk perhaps.
Click to expand...
So, there is no DISA O-ring to replace on a M54 E39 530i?
What's the consensus then? Don't try to add one?

Funny how this Ebay guy is selling it for the E39.
http://www.ebay.com/itm/BMW-E39-530i-M54-Engine-DISA-valve-O-ring-replcement-/260679616897?
 
#79 ·
So, there is no DISA O-ring to replace on a M54 E39 530i?
What's the consensus then? Don't try to add one?
Click to expand...
The M54 DISA valve's seal is molded into the O-ring groove. I believe this was a cost saving decision, since they were already molding in the silicone seals for the flapper valve and frame work. The stock molded seal can be carefully scraped out with a narrow flat blade screwdriver. Once that is done a -139 silicone O-ring is a perfect fit. The ring is totally captive in the groove and could never get sucked in anywhere. I would absolutely suggest doing this if you have a DISA seal vacuum leak.
 
Discussion starter · #80 ·
Thats good info about the 0 ring--I've made gaskets to fit and have worked well for me but thats a lot of trouble to go to.Any ideas on where to find a 139 0 ring?
 
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