New guy with new to me 08 Mini Cooper s. Purchased the car with the head off because of bent valves seared off sprocket because of a seized up brake booster. I rebuilt the head and now I’m trying to put this ride back together with the couple boxes of random bolts and parts that came with it.

 

No clue, but try here https://www.realoem.com/bmw/enUS/par...S&mg=&q=o+ring

 

mmmmm...I think it might be the o-ring for the thermostat breather.

 

Second that, the bleed screw on the thermostat has one of these tiny o-rings

 

Thanks guys.. I’ll go check it out!

 

Update.. this o-ring does not go to the thermostat breather or the a/c expansion part.

 

Fuel injector?

 

Yep, possible. I would check every part that has a notch for possible o ring . It could be a number of things/