Re: Power Steering
You don't say which 3 litre you are driving, but with a 164 the 'usual' way of restoring steering feel is to replace the strut bearings that allow the suspension struts to rotate easily. They get full of muck over time, seize up and ruin the feel. The other thing is to make sure the ball joint at the end of the wishbone is properly lubricated. You can..carefully..lift the rubber cover and regrease the ball joints and refit the cover..WITHOUT SPLITTING IT!!!!!!! Same goes for the steering ball joints as well.
When I get back from my hols I am going to do this very job and fit the new wishbones that arrived today.
If that doesn't improve matters then...have a cool beer and say.."c'est la vie" in your best Italian...but it SHOULD make a difference.