So I took the DIsa valve Out of the car to inspect it because there was a noise being made under the hood. The noise is not the valve but I also noticed it needs some attention. The flap is fine but when I do the vacuum test by holding my thumb over the whole the flap should stay put until you take your thumb off the hall which then it should open up. Mine does not state it just opens all the way up. What a repair kit help this or do I need to buy a new valve?
DISA rebuild kits do not and will not solve the issue if the DISA fails a vacuum test. Once the vacuum is gone, it's time for a new one.
He's right. I have seen one thread somewhere that a guy rebuilt the vacuum chamber, but he cannibalized another DISA to get the little rubber bell that serves as the seal for the vacuum.
I don't think holding your thumb over the vacuum port is a valid way to test it. There would be no vacuum present until the flap opened, which is is spring loaded to do. There has to be enough vacuum to close the flap against spring pressure.
I would bet it's fine. I have never seen the actuator portion of the DISA valve fail. It is quite uncommon.
Actually, this is EXACTLY how you test a DISA for vacuum. You hold the flap CLOSED, plug the hole with a finger, release the flap. The flap should open a slight amount and then hold until you release your finger.
It's always best to not provide information unless you know what is you are talking about.
If your disa failed the vacuum test just go find one at a junk yard that does pass the vacuum test and rebuild that one.
You can get a replacement diaphram here: https://www.ebay.com/i/252829435229?chn=ps
and a complete DISA valve kit with diaphram here: https://vanos-bmw.com/disa-bmw-repair-kits
Both come from Russia and take forever to clear customs but the quality of the parts is good IMO.
I went with the Vanos-BMW kit because both the vacuum pot and valve were bad.
Last edited by All2kool; 10-23-2018 at 10:44 AM.
SO is this the way to go? My DISA fail the vacuum test, although flapper still works fine. Before I did a vacuum test, I was going to do a regular rebuild. Although from what I'm reading here. A normal rebuild for a new flapper and o-ring, will not fix the vacuum. The correct way is a new OEM DISA or a rebuild kit with new vacuum port?
SO is this the way to go? My DISA fail the vacuum test, although flapper still works fine. Before I did a vacuum test, I was going to do a regular rebuild. Although from what I'm reading here. A normal rebuild for a new flapper and o-ring, will not fix the vacuum. The correct way is a new OEM DISA or a rebuild kit with new vacuum port?
I buoys used oem one. Check eBay
Rebuild kits DO NOT, let me repeat that DO NOT fix a DISA that no longer holds a vacuum. Your best option is to replace the DISA with a new OEM unit or find a good used one. Personally, I would not trust any used DISA that I could not personally perform a vacuum test on first.
Let me add that I am not saying you cannot rebuild a DISA and address the vacuum failure at the same time but you would need a working diaphragm from a DISA that is good. As far as I know, you cannot purchase a new diaphragm.
I may have one for you.
Opening the DISA to replace the diaphragm without damaging the chamber?
I don't think it's possible.
Well I obtained and replaced the vacuum diaphram. Opening and closing the vacuum chamber wasn't easy but it can be done -carefully-
I carefully took it apart, taking care not to pry so hard that parts break, and used a bit of silicone grease on the new diaphram so it would seat easily and not tear.
https://vanos-bmw.com/disa-bmw-repai...llation-manual
It seems like I also saw a You-Tube video showing how to do it but I can't remember for sure:
https://www.youtube.com/watch?v=5ZnFHzvXhJo
https://www.youtube.com/watch?v=ilnIgfXWjMU
You can get a replacement diaphram here: https://www.ebay.com/i/252829435229?chn=ps
and a complete DISA valve kit with diaphram here: https://vanos-bmw.com/disa-bmw-repair-kits
Both come from Russia and take forever to clear customs but the quality of the parts is good IMO.
I went with the Vanos-BMW kit because both the vacuum pot and valve were bad.
Last edited by BasilRathbone; 11-01-2018 at 03:53 PM.
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