Ye Olde Wheels Bearings

[Craig 930 RS]

Is there any difference in methodology for replacing wheel bearings in a 930 vs., say my old 79SC?

[Jim2]

Same spindles, bearings, and hub bore. No difference.

[PhatA55]

I can't comment on the fronts though they do use the same parts. The rears, however, are a different story. They are a major PITA. There are inner and outer tapered bearings and seals along with a spacer that is recommended to be replaced. The races suck to get out and require special tools or if you don't have them, ingenuity. If you just try to drive them out with a hammer and drift you risk a VERY expensive trailing arm replacement. The same holds true for installing the new races. You will also need a torque wrench that goes to 325 ft/lbs and a dial indicator with mag base. The bearings are pulled together by the drive shaft inserted through them. You will have to torque the axle nut to the specified value (can't remember what it is now) and check for play with the indicator. If the play is within tolerance you torque to the next value and so on.
If you have access to a lift life will be a lot easier, if not, I would remove the trailing arms. It can be done either way but speaking from experience trying to do this while laying under the car sucks. Do some searching and you'll find some info about it but not a lot. The best thing to have is the factory workshop manual, it's arguably necessary.

[David]

I've done the rears, but I had the arms off and I had to make the drifts to press the races out and the new ones back in. Like Mark said, a major PITA.

[Craig 930 RS]

Thanks guys. New discs a pads are needed up front after a year of track use, so bearings are a logical thing to replace/repack.

[fredmeister]

Talking of maintenance on the bearings in front, how often should they need to be adjusted and regreased? The owners manual says every 30k miles.....but this seems excessive compared to other cars on the mass market, which hardly ever see a repacking.
I do alot of DE events, and wondered if others saw a need to readjust bearings quite often on the front, along with the need to replace the grease.