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Thread: FWD rear stub axles

  1. #1
    I definitely ain't a Chief Engine Builder wagonist's Avatar
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    Default FWD rear stub axles

    I replaced the rear wheel bearings on my car this morning.
    They are from an ST184 Celica.

    I came across something which I think is a real & am wondering if its the same of other Toyotas.

    The stub itself presses into the inner race of the bearing from the outside, which then has a nut on the inner side to secure it.
    The outer race presses into the fixed part of the hub from the inside (which is then bolted to the car), but doesn't have a circlip or anything to stop it moving laterally inwards again.
    But I hear you say that the stub axles is on the other side of the fixed part, which is true, but it has a 5mm gap.

    Therefore, under some kind of heavy load (say hitting kerbs or cornering really hard), entire wheel, brake rotor, assembly can move inwards as its only held there by the pressure of the interference fit.

    This causes rubbing of disc on caliper (which I had machined down because they were rubbing $$$) & now the disc is rubbing again, so I've got to put non modified calipers back on again.

    I feel this is a really bad design.

    Would it be worthwhile getting a custom slot machined into the hub so I could fit a circlip?

    Sorry I've no pics to explain what I mean, it wasn't an issue until it was all back together again.
    Last edited by wagonist; 24-06-2006 at 01:01 PM.

  2. #2
    Junior Member Grease Monkey BigBadBenny's Avatar
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    Default Re: FWD rear stub axles

    With out pics I don't think I'll be able to help you.
    throw me some pics and I'll work it out
    Ben

  3. #3
    Junior Member Conversion King whatthe?'s Avatar
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    Default Re: FWD rear stub axles

    How crappy were the old bearings BTW? As bad as you thought?
    Project megap00 - Gave up and sold up. Money tree died

  4. #4
    I definitely ain't a Chief Engine Builder wagonist's Avatar
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    Default Re: FWD rear stub axles

    The old bearing weren't too bad.
    I did discover while pressing the new ones in, that you actually over-press the inner race so that it wold bind up.
    Maybe they'd worn enough to cause movement. It's pretty hard to replicate a sideways g-force loading of a 1300kg weight on the bench by hand.

  5. #5
    Junior Member Grease Monkey BigBadBenny's Avatar
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    Default Re: FWD rear stub axles

    sometimes there is a spacer washer that goes in the middle of both races, this can sometimes get left out when reassembling?....

  6. #6
    I definitely ain't a Chief Engine Builder wagonist's Avatar
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    Default Re: FWD rear stub axles

    The bearing is a genuine Toyota part, no washer. I think the overtightening is taking up the slight space in the bearing itself, as its not a sealed unit.


    Here's a quick CAD drawing I knocked up

    Red is the stub axle which spins with the wheel
    Blue is the bearing
    White is the fixed part of the hub
    Pink is the nut securing the stub axle to the bearing.

    See how theres a gap between the red & white, & then nothing on the right of the blue. That's how I think movement can occur.

  7. #7
    I definitely ain't a Chief Engine Builder wagonist's Avatar
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    Default Re: FWD rear stub axles

    Yep, its moved again.
    I must admit it had a bit of help from a kerb, but its still a crap design.

    2 options I've thought about for fixing this problem.
    1. machine a groove into the outer part so a circlip can be fitted. Though this will weaker the outer case.
    2. get a ring machined up that will fit between the bearing & the plate that the entire assembly bolts up to.

    Number 2 seems the best option, but I've got no idea how hard this would be to do. It'd have to be a press fit & the correct width.
    Last edited by wagonist; 20-07-2006 at 11:06 AM.

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