looks like it is coming from the passenger axle shaft carrier bearing housing.

Seems to be a flange screw M8 x 35mm, pn: 988983

https://www.fcpeuro.com/products/volvo- ... lvo-988983

BlackBart wrote: ↑28 Jan 2024, 14:41 Was this assembled by Boeing?

LOL

Those 3 plugs we can see the ends of look not too terrible, but worn on the electrodes.

The 2 bolts are for the spark plug cover as you have probably figures out by now, and you have the answer for the cap.

Neil.