I'm part way through more restoration work on the turbo and as I now have the torque tube removed so I can tackle the RMS, I'm considering if I should get the torque tube rebuilt?
I've spun the torque shaft by hand and there does not appear to be any play or grinding but there is some noise (kind of like a skateboard wheel when spun). Could this be indicative of dry bearings? Is this normal or are rebuilt torque tubes totally silent?
Next question is if I did rebuild I've heard the C5 bearings that Porsche originally used are not available and that C4 should be used. I've also seen the super bearings from the US but they are pretty expensive! Possibly £1000 after taxes and customs duty for a set of 4....
![](http://i.imgur.com/Rih1P0rl.jpg)
I've spun the torque shaft by hand and there does not appear to be any play or grinding but there is some noise (kind of like a skateboard wheel when spun). Could this be indicative of dry bearings? Is this normal or are rebuilt torque tubes totally silent?
Next question is if I did rebuild I've heard the C5 bearings that Porsche originally used are not available and that C4 should be used. I've also seen the super bearings from the US but they are pretty expensive! Possibly £1000 after taxes and customs duty for a set of 4....
![](http://i.imgur.com/Rih1P0rl.jpg)