My R-spec 6374 makes weird noises when i turn it with my hands. Sounds like a stone or something but it wont fall out from spinning or blowing air in. Sound a bit like metal scratching on metal Could it be that one magnet broke? I saw somewhere a post with a broken magnet in enertion motor.
To open the motor you need to take off the pulley and remove all the C-clips from the motor shaft there should be 2 c-clips holding on the pulley an on holding the motor shaft in front of bearing. Once you have taken out the c-clips the rotor or Outside part of the motor should simply slide out, it may require some force to pull it out due to the strong magnets. A pair of C-clip pliers would be ideal but I have done it without them using a flat head screw driver, just remember to be careful of the c-clips as they can fly off so it might be a good idea to put the motor in a zip lock bag while taking off the c-clips.
Thanks i will try it!
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Also while you have to motor apart use an old toothbrush to clean out all the dirt 
Im finish now, i actually found a rly little magnet splinter nothing big. Now its spinns free. thx 
Same thing just happened to me. How long did it take you to get it open and did you replace the magnet
I didnt had to replace a magnet. There was a really small magnet splinter. but nothing big or broken. I needed araund 20-30mins to open, clompletely clean out (A old toothbrush is perfect for it) and close/mount.
Thanks. Ill have to do that this weekend