I am just getting started with overhauling the engine of my BX, and a thing that has been bothering me is this oil leak. I think it is coming from under the starter actuator, but I could be wrong. (indeed I was, check PS)
Me and another chap who are working on the car don't have a clue on how to fix it, so any suggestions would be greatly appreciated!


Notice how the yellow vacuum line is coated with oil. I suspect the insides of the advance are also gummed up.
EDIT:
Also, ignore the fact that there is oil on the advance itself. This is from the fuel pump which started leaking recently.
PS;
I have since learned that this isn't a "started actuator", but is instead the timing advance on the distributor.