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Old 02-09-2012, 04:40 AM   #51
Registered User
Join Date: Dec 2009
Location: Australia
Posts: 387
My Ride: 325ci
Quote from original post:
For those that cannot find the O-ring, the measurements are as follows for possibly match up:
Thickness - 3.5 mm
I.D. - 48 mm
O.D. - 55 mm
Preferred material - silicon, however, rubber may substitute

THIS IS NOT CORRECT FOR M54 ENGINES!! I bought this size O-ring and it was to small. However I stretched it on but the O-ring thickness (3.5mm) did not allow me to put the DISA back into the intake with ease.
As I needed to get the car back on the road (late at night) I found my self using emery paper on the O-ring to reduce the diameter and now I need to get a new DISA as the plastic cracked at the area where the bolt goes through the DISA in trying to bring the face of the DISA up to the manifold. In reality I should have measured up the part and put the DISA back in and purchased the correct size O-ring.

See photo for the size... (I'll let you be the judge)

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