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Thread: DISA 0 Ring
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Old 02-25-2011, 10:54 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
Not really understanding the problem at hand, I started with the measured readings provided today, and then worked backward to a standard o-ring size:
  • Measured
    • 50mm ID x 3.2mm cross section
    • 50mm ID x 3.5mm cross section
    • 51mm ID x 2.5mm cross section
  • Reference SAE Aerospace Standard 568
    • -226 50.390.46mm ID x 3.530.10mm cross section (nominal 2-1/4" OD, 2" ID, 1/8" CS)
    • -136 50.470.43mm ID x 2.620.08mm cross section (nominal 2-3/16" OD, 2" ID, 3/32" CS)
However, in the middle of the research to try to create a replacement chart, I realized (belatedly) that ECS Tuning already sells the M54 engine DISA o-ring.

So, since ECS Tuning already sells what I spent a few hours looking up, can someone summarize for me what the E39 DISA o-ring procurement problem actually is?

Is it simply that we're not sure if the M52TU & M54 DISA o-rings are the same size?

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