Hi all,
I would like some help to make sure I get the linkage set up and whatever bench testing I can do to avoid any more adjusting than I need to after it is installed.I don't have any good pictures to refer to because the linkage was disconnected when I started, so if you have a picture of how it's supposed to look that would help.

http://i208.photobucket.com/albums/bb173/cngenghum/AirboxMP1.jpg

Fist off, does the linkage look right?
is valve (1) supposed to be open or closed when the door (4) is open? (or is there another rule for adjusting this?) The way I adjusted it so far is by fixing the rotation of (1) with nut (2)
When I tighten nut (3) it seizes up the linkage, is there supposed to be a bushing or jam nut that allows it to move after tightening?
Any tips on adjustments, bench testing or anything else that's easier to do before it's installed will be greatly appreciated.
Thanks!