putting a journal bearing at each end of the turbine rotor or shaft would be to support it.
I am assuming by rotor bearing you mean a wheel bearing, to see if a wheel bearing is bad there are two was to do this, first is to move the wheel in a up and down motion (with your hands) and see if there is any play, the other way (if it is the front wheel bearings this will only worth with an awd or fwd vehicle) you can lift the car and put it in drive and listen for any noise coming from the bearing itself, you may need a pair of electronic ears or a stethoscope to do this, if there is a grinding or rumbling noise at all, you have yourself a bad wheel bearing
Wheel imbalance, bad wheel bearing, bad rotor(s).
I would start checking spark plugs and wires, if they are good I would then check the distributor cap and rotor bug. I would start checking spark plugs and wires, if they are good I would then check the distributor cap and rotor bug.
How are your calipers an wheel bearings looking. i had a bad wheel bearing and actually blew and warped my rotor.
Check the bearing and wheel lugs.
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I would recommend checking for codes before you do anything else.
If you have a bad rotor, when you turn a corner sharply it will make a humming noise kind of a wah wah wah (if you will). If you have it apart, the bearing would probably look visibly worn, rusty, dry, ground down etc. Hope this helped.
3 asses
I would recommend checking the dist.cap and rotor .It could be carbonized which quite possibly could be the problem. Also check all of the spark plugs and wires while your at it.