Front to back it runs: Ex In In Ex Ex In In Ex Ex In

Not sure what motor you have, exhaust clearance is supposed to be .30mm for non-turbo and .35mm for turbo.

Roughly, my technique is:

1 - Loosen bottom nut (CW) while holding top one steady, if possible. May have to slightly turn top one very slightly (CCW) to get them apart.

2 - Adjust top nut to just a hair tighter clearance than I ultimately want it at, and bring bottom nut up to just touch it.

(2b) - You may want to ensure the clearance stays steady when the valve is rotated. If not, set clearance at tightest spot.

3 - Hold top nut steady and start tightening bottom against top (CCW), then give top nut a slight snugging down (CW) as they get to final togetherness.

4 - If all went well, the clearance is now correct and the nuts are tight.

The play between the threads that gets taken up when you tighten the two nuts together is where the weirdness happens. Get a feel for that and you're all set.

If someone has a better way, I'm all ears too!

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1984 300D Light Blue/Blue
2006 C280 Silver/Black