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See...that's why the original spec sheet would be nice.

Thanks again for the suggestions, a big part of working on these vehicles is to get close to the originial on this kind of detail, since the design goals are not often exactly known. It now looks like the O-rings are in fact supposed to be flat on the contact surfaces, just down a little from...

:-)

Thanks for the offer Mike! Measuring it, I come up with: OD=3.400 ID=2.950 Cross sectional height=0.186 Cross sectional width=0.225 Perhaps it was never circular in cross section, but if that's all that's easily available, that will have to do for the time being. The O-rings help seal the...

Thanks, I'll keep that in mind.

I need to replace 8ea O-rings on the 757, they are about 3 inches in dia and seem to have been flattened from use after 38 years. NAPA measured one of them and came back with a "discontinued".... I need the exact spec on them to go any further, so if someone has access to the right data base...