Postby rgripp » Fri Feb 10, 2006 12:33 am
For reasons I won't go into, I have had a little experience of these, and it has been all unpleasant. XJS subframes seem worse than XJ6 subfames - less oil contamination?
The design is such that even if you were to remove the head of the shaft completely, it still can only come out one way. The shaft is carried within a metal tube inside the subframe and the slightest corrosion on the surface seizes it a treat. You can't get to this tube to heat it without destroying the subframe.
Turning the big bolt head at the end is a waste of time, it will just rotate around the shaft if you apply enough pressure.
If you actually get it to move, then you can have trouble getting a shaft behind to drift it all the way without it jamming.
Loads of penetrating oil - Plusgas better than WD40.
Using a lump hammer, hit the head of the shaft TOWARDS the subframe several times - hopefully you will hear a change in note when it frees up. Then drift out the shaft from the other end. Do not use a sledgehammer, as you might miss in temper and clout the steering rack mountings.
Heat might help, although one's inclination would be to suggest that it would tend to cause expansion of the shaft in its constraining tube. I think that when it is successful, destroying the bushes in the process has reduced some of the bind.
To summerise: releasing fluid, patience and skill. Then go back the next day and give the bloody thing a real clout in blind rage, and it will loosen nicely.
WARNING - the above is the opinion of a biologist, not an engineer.
Good luck with it. Robin.