How can you tell if a hub is broken? | FerrariChat

How can you tell if a hub is broken?

Discussion in '348/355' started by Gimme Fuel, Apr 19, 2009.

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  1. Gimme Fuel

    Gimme Fuel F1 Veteran

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    Guys..

    I've got these two hub's from a friend of mine which had his
    hub's replaced after he heard a "crunching" noise from the rear axle.

    I took one of the hub's apart and gave it a proper clean, and I cant
    really say whats wrong with it:confused:
    Anyone who knows what to look for???

    The last pic shows you the inside of an uncleaned hub, in which was very
    greasy and messy.
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    Last edited by a moderator: Sep 7, 2017
    Gimme Fuel, Apr 19, 2009
    #1
  2. rivee

    rivee F1 Rookie

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    Who told your friend it was the hubs that were faulty?

    Did he change them because someone told him to?
     
    rivee, Apr 19, 2009
    #2
  3. Gimme Fuel

    Gimme Fuel F1 Veteran

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    To be honest, I did + someone else, I had not heard the "crunching" noise so I just
    gave him a suggestion of what it COULD be.
    I then ordered 2 new hub's for him form the UK, they got replaced - and the "crunching"
    noise was gone....hmmm
     
    Gimme Fuel, Apr 19, 2009
    #3
  4. 2NA

    2NA F1 World Champ Consultant Owner Professional Ferrari Technician

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    If there's a bearing problem you should be able to find some damaged balls or spalling of the race surfaces. I don't see your noise in any of the photos. If it's a "crunching" sound the problem should be easy to spot on a bearing.

    If the noise is gone you apparently made a good call.

    How are the CV joints? Are the rubber boots intact?
     
    2NA, Apr 19, 2009
    #4
  5. Gimme Fuel

    Gimme Fuel F1 Veteran

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    All the balls are intact, even the plastic "ball holders" are perfect, along with everything else...
     
    Gimme Fuel, Apr 19, 2009
    #5
  6. PAP 348

    PAP 348 Ten Time F1 World Champ Lifetime Rossa Owner

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    Interesting!! :):)
     
    PAP 348, Apr 19, 2009
    #6
  7. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Have look at the connecting flange.

    Some times the flange can get cockeyed inside the bearing race and wear a groove in it. At lease that is what happened to my car. Though I have an earlier 348 with a different axle hub. Anyway, with my car I was hearing a grinding sound when turning corners because of the stress place on one side of the bearing, and because of the flange being cocked. As a result, on one side the connecting bolts for my cv joint were knocking against the bolts for holding the axle bearing in place on the side face of the hub. The cause on one side was a piss poorly tightened ring nut.

    So take a good look at the shaft of the flange to see if it shows signs of wear.
     
    Last edited: Apr 20, 2009
    ernie, Apr 20, 2009
    #7
  8. Gimme Fuel

    Gimme Fuel F1 Veteran

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    Ernie.
    Do you have another word for "connecting flange". (I'm not sure what that means) :D:D
     
    Gimme Fuel, Apr 20, 2009
    #8
  9. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    It's the part in the very first picture.
     
    Last edited: Apr 20, 2009
    ernie, Apr 20, 2009
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  10. Gimme Fuel

    Gimme Fuel F1 Veteran

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    ahhh...

    I'll go out and check right away....
     
    Gimme Fuel, Apr 20, 2009
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  11. Gimme Fuel

    Gimme Fuel F1 Veteran

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    Last edited by a moderator: Sep 7, 2017
    Gimme Fuel, Apr 20, 2009
    #11
  12. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    The inside teeth look okay, but there seems to be quite a bit of rust.

    Now how about the outside of it? The part that the bearing slides over.
     
    ernie, Apr 20, 2009
    #12
  13. Gimme Fuel

    Gimme Fuel F1 Veteran

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    When I put it together, like pic 3 - I can then turn the hub around perfectly, no noises or
    resistance what so ever (but that not under preasure/load though)...and there's no gap/space between the connecting flange
    and the utter bearing.

    The balls and the brown "ball holders" also seem to be in good shape,
    think I have to clean the other hub too...
     
    Gimme Fuel, Apr 20, 2009
    #13
  14. Gimme Fuel

    Gimme Fuel F1 Veteran

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    Can the "crunching" noise be caused by lack of grease???
     
    Gimme Fuel, Apr 20, 2009
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  15. Gimme Fuel

    Gimme Fuel F1 Veteran

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    It's not rust actually, is some sort of sticky goof of some sort, there's no problem
    to get rid of that stuff...
     
    Gimme Fuel, Apr 20, 2009
    #15
  16. Gimme Fuel

    Gimme Fuel F1 Veteran

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    I've just finished cleaning the other hub, and I discovered this...
    these grooves goes all around.

    There were also a slight different color on the balls who have made the grooves in the pics.
    Maybe it's me imagine things, but something tells me the balls does not have the same size
    as the other set of balls....but it's extremely hard to really see IF there is any difference in size,
    and I havent got the tool to do the exact measure.
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    Last edited by a moderator: Sep 7, 2017
    Gimme Fuel, Apr 20, 2009
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  17. PAP 348

    PAP 348 Ten Time F1 World Champ Lifetime Rossa Owner

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    Yep yep, shes ****ed mate! :D:D

    Good call. ;);)
     
    PAP 348, Apr 20, 2009
    #17
  18. ernie

    ernie Two Time F1 World Champ Lifetime Rossa Owner

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    Pretty much what Pap said. New bearings and it "should" be good to go. But again, make sure that the axle connecting flange is in good shape before you fit new bearings to it.
     
    ernie, Apr 21, 2009
    #18
  19. gidge348

    gidge348 Formula Junior

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    May have also been a lack of grease or water in there as well..... the race is fairly blue,

    Low grease or water in there leads to overheating,

    Overheating breaks down the case hardening on the bearing races....

    The bearings then proceed to pick at the races next thing you know bearing is RS.

    Looks like you picked it up in time, change some bearings (and check the hubs) and you should have a couple of good spares.
     
    gidge348, Apr 21, 2009
    #19

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