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Thread: Bearing shrinkage

  1. 23rd November 2013, 07:26 AM #1
    Jeff's Avatar
    Jeff
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    Bearing shrinkage

    I am turning a bearing housing for the rear wheel of my race sidecar, and want to know how much do bearings shrink if you chill them? The old housing was a loose fit and it shouldn't have been.


    Start with a billet of 7075-T6

    Make lots of swarf.

    The bearing is on the right. 1 inch inner 2 inch outer.
    Jeff

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  2. 23rd November 2013, 07:49 AM #2
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    Bearman
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    I have never measured the difference after chilling as you have to get it installed asap as it returns to original spec pretty quick, but it does make a tight bearing slip in pretty easy.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)
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  3. 23rd November 2013, 07:55 AM #3
    uninformed
    uninformed is offline ForumSage
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    I would have thought the amount that a steel bearing would shrink if put in the freezer alot less than the expansion of a aluminium housing if heated.

    I put some standard LR wheel bearing cups in the freezer to shrink for installing in the hub. IMO it did not make bugger all diference, if anything the condensation was a PITA.
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  4. 23rd November 2013, 08:10 AM #4
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    Pedro_The_Swift
    Pedro_The_Swift is offline The MOD Father
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    might help?
    Liquid Nitrogen Services
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  5. 23rd November 2013, 08:23 AM #5
    komaterpillar
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    I had to install a boss on a 5" shaft, 6thou interference fit, chilled the shaft with liquid nitrogen and got the boss to 160℃ on a hotplate and they slid together fairly easily with minimal persuasion,

    Getting the old boss off was another story, 80tonne ram on porta power and a LOT of heat.....
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  6. 23rd November 2013, 08:27 AM #6
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    Pedro_The_Swift
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    yep,,
    with interference fits you MUST be sure the first time,,,
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  7. 23rd November 2013, 08:47 AM #7
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    bee utey
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    Most shaft bearings I have met have a slight clearance in the housing. This allows the outer race to creep and equalise wear around the whole ring. If you're going for a press fit make sure your bearing is toleranced for same.
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