Thread: DISA 0 Ring
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Old 09-30-2011, 07:58 PM
Bazza-Aus Bazza-Aus is offline
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Location: Australia - Kalgoorlie
Join Date: Sep 2011
Posts: 44
Mein Auto: 2002 530i
Originally Posted by pleiades View Post

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

Putting an o-ring onto an old worn unit might be a bit of a risk perhaps.
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Last edited by Bazza-Aus; 09-30-2011 at 08:41 PM. Reason: Attached pics of old DISA Vs new DISA
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