Thread: M90 Rotor Bearings

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  1. #1 Re: M90 Rotor Bearings 
    Donating Users GR8racingfool's Avatar
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    If thats what you want to replace, then yes, those are the case needle bearings.

    You have to remove the blower from the car, tap two already drilled holes, thread in a modified bolt/zert tool thats usually self made, and press them out using pressure from a grease gun.

    Most likely this will not solve your problem.

    There are two bearings ON the rotor assembly them selfs that wear out, and will cause massive play in the rotors causing them to "knock" together when they run. These will need to be replaced most likely, where you remove the drive and driven gear from the ends of the rotor shafts, press out the rotor shafts with the rotors being careful to keep them in time, and then press out the bearings and seals and press in new and then put it back together again, making sure you keep the rotors in PERFECT time and you should be good to go.

    Many cannot rebuild the rotor assembly them selfs, or find ny shop willing to do it so thats why they find a good used set with low miles and install those.

    But you can always email or PM Brian and see what he says.

    ~F~
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  2. #2 Re: M90 Rotor Bearings 
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    Would it be easier to just goto a U-Pull-It yard and just get a whole new blower with low miles, and swap everything out of it? Cone and coupler and internals and everything? I've seen 'em at UPullIt yards not far from here for pretty cheap.
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  3. #3 Re: M90 Rotor Bearings 
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    Unless your case is ported, I wouldn't worry about swapping the internals. If you find a low mileage blower, just use the whole thing.
    2004 Impala LS - got some mods sold!!!
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  4. #4 Re: M90 Rotor Bearings 
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    Quote Originally Posted by Cyko View Post
    Would it be easier to just goto a U-Pull-It yard and just get a whole new blower with low miles, and swap everything out of it? Cone and coupler and internals and everything? I've seen 'em at UPullIt yards not far from here for pretty cheap.
    It's not really necessary to get an entire blower, but if you can find one cheap enough you can pull everything out without breaking the seal and swap it....I would be interested in any blower cases you run onto though, since they make good porting candidates.

    Scour the classifieds, it seems that there's always someone selling rotors.
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