Originally Posted by
E34-520iSE
There's two ways to repair that. One is to remove the head and fix it with the head off, the other way is to loosen the engine mounts, jack the engine up, remove the bonnet, rad, cam belt & pulley wheel etc,slacken all the rockers off on that shaft, pull the locking t-piece out of the slot and attempt to slide/pull the rocker shaft out of the head. They are a tight fit in the head and won't come out without a fight though, so be aware you may need to find a good rocker shaft to replace the old one that could be damaged. It's up to you which way you do it, but if it was me doing it I would just take the head off.
HTH,
Shaun M