Here I press out the hub and ball-joint from my spare o/s front suspension upright ready to fit new parts. It's not a complicated job as such but you do need the right kit and the ability to hit things really hard without breaking them.
This is a basic diagram of the front suspension
:
The home made press frame which utilises a porta power hydraulic chassis repair ram.
Here's the upright in the press. I loosened the four bolts but left them in an equal amount so I could push on them all at once to start with rather than the centre of the hub. This lessens the chance of the hub going out of alignment and damaging the upright:
A clearer view of the back of the hub:
This hub came out with barely any pressure, unlike the ball-joint which was stuck so very tight:
Setting fire to it didn't help.. I cut the pin off as it makes it easier to push, hammer and generally abuse the joint.
Eventually the ball-joint let go. It took two of us, a lot of heat in the upright and lots of hammering to get it to move. Once it moved a little getting it out the rest of the way was easy.
I did the other side last year and in contrast the ball-joint was dead easy whilst the hub put up a real fight and took over 12 tons to push out. I actually prefer that it that way around because getting the upright correctly set up in a press for the ball-joint is very tricky. The upper end of the upright is right in the way and as you can see there's very little meat on the upright around the ball-joint to get a purchase on. Having anything even a little of centre is not an option, you have to be spot on with these sorts of forces involved and the consequences of distorting the alloy parts are pretty big, especially if it's your cars original one.
All in I would say that this is a doable but awkward job with many variables relating to the corrosion holding onto the hub and ball-joint. It could be easy, it could take you all afternoon. Personally I wouldn't tackle it with the original upright from my car, only with a spare one as I did here because if it goes wrong then you aren't stranded with no car and no spare upright. I have heard of them being scrap because the hub is stuck so tight..
Fitting the new hub is easy as it's not a true interference fit, just snug. The ball-joint is different. It's purely interference and the same things that make it awkward to remove in a press make it a pain to fit. I will be exploring different options and will update as and when I do it.