Before I replace the wheel bearings... | FerrariChat
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Before I replace the wheel bearings...

Discussion in 'Technical Q&A' started by DANCER308, Dec 14, 2011.

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  1. DANCER308

    DANCER308 Formula Junior

    Oct 24, 2009
    935
    KY
    Full Name:
    Dan
    #1 DANCER308, Dec 14, 2011
    '79 308 GTS I just finished my first timing belt change. Went pretty smooth, but that AC unit, wow. Dropped all shims, had to realign, that was fun. Finished everything and was putting the wheel back on. Tightened the lug bolts, and for some reason decided to grab the wheel at the top and bottom, noticed movement. Obvious bearing problem. Took the wheel hub out and over to the bench. I would like to sincerly thank the last person that was in there. IT'S CALLED A RING NUT TOOL DUDE, GET ONE! OK, I feel much better know. The ring nut looked like it was taken out and put back in with a hammer and chisel. It only took a couple of light taps with a chisel to loosen the nut. Two questions, Does the inner bearing fit loose on the shaft, and could the loose ring nut be causing the movement?? OK, three questions, should the bearings fit tight against the bearing spacer? The bearings look new.
     
  2. DANCER308

    DANCER308 Formula Junior

    Oct 24, 2009
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    Dan
    #2 DANCER308, Dec 14, 2011
    Last edited by a moderator: Sep 7, 2017
  3. DANCER308

    DANCER308 Formula Junior

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    #3 DANCER308, Dec 15, 2011
    Clearance between inner bearing and shaft .006 .152mm
     
  4. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,673
    San Carlos, CA
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    Mitchell Le
    #4 yelcab, Dec 15, 2011
    torque spec for Axle shaft to flanges is 80 Nm. Did it feel loose?
     
  5. ernie

    ernie Two Time F1 World Champ
    Lifetime Rossa Owner

    Nov 19, 2001
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    The Bad Guy
    #5 ernie, Dec 15, 2011
    OUCH!!!!

    That looks awful.
     
  6. plugzit

    plugzit F1 Veteran
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    Dec 1, 2004
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    Bruce Bogart
    #6 plugzit, Dec 15, 2011
    ....or 4 whacks with a 4lb sledge and a cold chisel?....
     
  7. DANCER308

    DANCER308 Formula Junior

    Oct 24, 2009
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    #7 DANCER308, Dec 15, 2011
    It took a light tap with a claw hammer and chisel and it came loose.
     
  8. plugzit

    plugzit F1 Veteran
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    Dec 1, 2004
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    Bruce Bogart
    #8 plugzit, Dec 15, 2011
    If the bearings look good, no heat or galling, no visible wear, you can probably just put on a new ring nut properly tightened and let it eat.
     
  9. DANCER308

    DANCER308 Formula Junior

    Oct 24, 2009
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    KY
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    Dan
    #9 DANCER308, Dec 15, 2011
    Does the clearance sound about right for the inner bearing to shaft... .006 .152mm
     
  10. DANCER308

    DANCER308 Formula Junior

    Oct 24, 2009
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    #10 DANCER308, Dec 15, 2011
    If you are refering to the ring nut, it came loose easily with a tap from a hammer and chisel.
     
  11. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    #11 Steve Magnusson, Dec 15, 2011
    Last edited by a moderator: Sep 7, 2017
    No, that would be much too loose, but the shaft is stepped-down so make sure that you are measuring the shaft in the right area as shown in this jpeg:
    Image Unavailable, Please Login
     
  12. DANCER308

    DANCER308 Formula Junior

    Oct 24, 2009
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    #12 DANCER308, Dec 15, 2011
    Thanks Steve, I always appreciate your expertise. I will measure it again, I didn't know the shaft was tapered. Maybe a new nut is all I need.
     
  13. DANCER308

    DANCER308 Formula Junior

    Oct 24, 2009
    935
    KY
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    Dan
    #13 DANCER308, Dec 16, 2011
    Just found another result from this, the brake pads are worn unevenly. One pad is thicker at the top than the bottom, and the other pad is just the opposite. Too bad too, they only had 3k miles on them. This is the result of the disc being at an angle to the hub carrier. All because someone didn't have a ring nut tool.

    For the want of a nail... the kingdom was lost.
     
  14. Corsa308

    Corsa308 Formula Junior

    Apr 22, 2007
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    Steve D
    #14 Corsa308, Dec 21, 2011
    Re-built mine a short while ago with new hub shafts coz one of them sheared off.
    Torque it up as above to 80nm, believe me when you do that you will really know how tight it should be. Certainly shouldn't come off that easily. Also there should be a lock washer with lugs to lock it off once torqued up.

    Steve
     
  15. Martin308GTB

    Martin308GTB F1 Rookie

    Jan 22, 2003
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    Martin N.
    #15 Martin308GTB, Jan 1, 2012
    Hello from Germany,

    the ring nut has to be torqued down with 220 Nm not 80.
    80 Nm is the torque for the M10 bolts flange to axle drive shafts.

    Best Regards

    Martin
     
  16. DANCER308

    DANCER308 Formula Junior

    Oct 24, 2009
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    Dan
    #16 DANCER308, Jan 3, 2012
    Thanks, yes I caught that.
     
  17. White Knight

    White Knight Formula 3

    Aug 22, 2011
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    Todd S.
    #17 White Knight, Jan 3, 2012
    Car repair...so easy, a caveman...wait, I think that already happened.

    At least you caught it now; could have been much worse.
     

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