Hey guys, got the trans (722.369) rebuilt and installed. I started filling it with fluid when I noticed a leak. It was leaking from the Vacuum Modulator. When I installed the vac mod I did so with a thin o-ring. I have it out and looking at it, the O-ring is pretty thin. I downloaded the service manual and it called the part a "sealing ring" elsewhere
on other parts it'll say "o-ring". So, is the seal for the vac mod a rubber o-ring or a metalic sealing ring/washer like on the fluid lines?

Thanks,
Shawn

Its a o-ring, not a copper crush washer.

I don't know if you are using a old style or new style modulator. But it just slides over the end, and it gets squished in once you tighten down the retaining plate.

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Just my MB's:
1990 420sel - Winter DD - 410,000km
1990 560sel - absolutely showroom mint - 360,000km!