Sorry to bring up an old thread but I'm in need of some info. my super charger just had a rebuild and there was a noise that had started about 5000 miles after install. The only bearing I didn't do were the ones in the rotor pack. I'm selling the rig the charger was on so I pulled it off anyway but to my surprise all the bearings I rebuilt with looked great. oil was black though. is all this normal? I want to rebuild it completely this time and which includes the rotor bearings but iv always heard not to touch them. or the gears have to be perfectly timed. I would like more info on how you marked them when you did them or where can I get those seals behind the bearings. I am mechanically inclined and have access to a press and other useful tools. any help would be greatly appreciated. the noise was low rpm maybe 1200 sounded like dry bearings almost. like a sound a she makes. baaing