In article <Pdydnc7IbMxQwFzenZ2dnUVZ8qidnZ2d@pipex.net>,
> Michael Pardee wrote:
> > "Mungo "Two Sheds" Toadfoot" <email@example.com> wrote in message
> > news:t4ednfA96dKeo1zeRVnyig@pipex.net...
> >> Hi all,
> >> 1989 740 - the power steering is heavy when the engine is first
> >> started,
> > The power steering is all hydraulic - no vacuum. What you describe is
> > a cold weather phenomenon that is usually called "morning sickness."
> > The seals in the rack shrink and don't let the pressure develop until
> > they warm up a bit. It will gradually get worse, lasting longer and
> > happening at warmer temperatures. Rack rebuild or replacement is the
> > real cure, I'm afraid. Not cheap.
> > Maybe somebody has had good results from a power steering additive
> > that is supposed to revive seals. At this point, it isn't likely to
> > hurt.
> Thanks Mike, I'll see what I can find to pour in there!
It was a common problem for many mfrs throughout the 80's and 90's. The
technicak name is morning sickness. The internal seals swell jus a
little bit when the oil is cold and shrink back down against once the
oil warms up. The cure was to replace the rack with newer type seals
that were less low temperature sensitive. If you turn the wheel all the
way from stop to stop a few times before driving off you'll force the
pump to produce maximum pressure and heat up the oil as it bypasses.
The goal when driving is to miss the maximum number of objects.