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Thread: DISA 0 Ring
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Old 05-15-2011, 10:37 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
I'm confused.

The original M54 DISA O-ring apparently has a rectangular cross section.

But, if I understand the fix here, you guys are replacing the rectangular o-ring with a circular cross section o-ring. Is that right?

And, what about the 'vertical sealing strips' (which are shown in the photo I previously posted from this thread)?
- Engine code po171

Are people fixing the vertical strips also?

Originally Posted by pshovest View Post
No one had proposed an oring solution when I had the problem and I'm not convinced the oring fix is the best. The M52TU uses an oring, but the M54 DISA seal is not an oring. It is a molded part that doesn't have a round cross section. If the replacement oring is too thick, the DISA won't be properly seated and sealed in the intake manifold. Notice the two vertical sealing strips on the DISA in the photo? The Form-a-gasket fix is less likely to interfere with these seals.

It's been 15k miles and all is well.

Last edited by bluebee; 05-15-2011 at 11:00 PM.
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