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  1. #1
    Join Date
    Feb 2007
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    West Sussex
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    XJ6 Front wheel bearings

    Does anyone know how to tell the difference on hubs from pre/post '77 XJ6, or am I down to checking serial numbers on the existing bearings once everything is pulled apart?
    This is in preparation for fitting a set of Simon hubs - assuming I need a wheel bearing kit to do this.
    Last edited by KevinW; 19-02-20 at 05:03 PM.
    Crendon Chassis No.49
    Huddart FE428 + toploader

    Not listed in the Shelby Register.

  2. #2
    Join Date
    Jan 2004
    Location
    Southwest, Somerset, U.K.
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    35
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    3,233
    Early ones have a smaller stub axle and bearing. Later ones are larger.

    Can’t remember measurement but I have one of each in the garage I could measure and let you know dimensions tomorrow.

  3. #3
    Join Date
    Jan 2006
    Location
    Chelmsford Essex
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    1,050
    Hi Kevin,

    The stub axle is thinner on the earlier version and the castle nut is a different size. The stub axle is thicker on post '77 bearing od 45.2 mm. The stub nut size is also different. I have seen comments that the castle nut is on the early versions and non castle on later ones. But I would not just go off by the type of nut as people do change things!

    LM12749/10 Tapered roller bearing LM12749/LM12710 22*45.237*16.637mm is post '77.
    Dax 351 Cleveland T5 2.88 PL

  4. #4
    Join Date
    Feb 2007
    Location
    West Sussex
    Posts
    8,728
    Many thanks for the replies - need to have a look see, but at least I know what I'm looking for now!
    cheers,
    Kev
    Crendon Chassis No.49
    Huddart FE428 + toploader

    Not listed in the Shelby Register.

  5. #5
    Join Date
    Mar 2017
    Location
    Alton, Hampshire
    Posts
    65
    Hi Kev,

    I've just started exactly the same project.

    I didn't know which age of front hubs I had either, but now that I've taken off the hubs and bearings I am able to measure the bearing size. In my case, the outer bearing has an internal measurement of 19mm, this turns out to be a pre-77 hub. I think the post-77 hub outer bearings are quite a bit larger.
    Jon LR

    Magnum with Ford 302ci & 4 speed Toploader

  6. #6
    Join Date
    Feb 2007
    Location
    West Sussex
    Posts
    8,728
    Thanks Jon.
    Haven't actually pulled mine apart yet, as my dash re-wire is taking ages to finish.
    But might start it this w/e as the Mrs is away.
    Crendon Chassis No.49
    Huddart FE428 + toploader

    Not listed in the Shelby Register.

  7. #7
    Join Date
    Jan 2006
    Location
    Chelmsford Essex
    Posts
    1,050
    Yes if they are later post-77 internal bore is larger 21.986mm and the stub axle is larger to accommodate.

    Bore: 0.8656 inch / 21.987mm
    Outside Dia: 1.7810 inch / 45.237mm
    Width: 0.6100 inch / 15.494mm

    They usually stamped LM12749/LM12710

    Also best to use quality bearings like Timken or SKF .

    https://simplybearings.co.uk/shop/ad...ywords=lm12749

    These bearings are still readily available as they are used on fairly recent Mercedes.

    The adjustment in the Haynes manuals suggests an end float 0.003 and 0.005 inc (0.08 and 0.13mm). I have always found a slight play rocking the top and bottom of the wheel when set as suggested possible MOT failure.
    Another suggested method from Jaguar forum is pre-load the bearing by tightening to a set torque ( 25 ft lbs)and rotate the wheel at the same time. This loads and moves the grease. Then back off one flate and fit split pin. This method appears to work better.
    Dax 351 Cleveland T5 2.88 PL

  8. #8
    Join Date
    Feb 2007
    Location
    West Sussex
    Posts
    8,728
    Quote Originally Posted by jon1d View Post
    Yes if they are later post-77 internal bore is larger 21.986mm and the stub axle is larger to accommodate.

    Bore: 0.8656 inch / 21.987mm
    Outside Dia: 1.7810 inch / 45.237mm
    Width: 0.6100 inch / 15.494mm

    They usually stamped LM12749/LM12710

    Also best to use quality bearings like Timken or SKF .

    https://simplybearings.co.uk/shop/ad...ywords=lm12749

    These bearings are still readily available as they are used on fairly recent Mercedes.

    The adjustment in the Haynes manuals suggests an end float 0.003 and 0.005 inc (0.08 and 0.13mm). I have always found a slight play rocking the top and bottom of the wheel when set as suggested possible MOT failure.
    Another suggested method from Jaguar forum is pre-load the bearing by tightening to a set torque ( 25 ft lbs)and rotate the wheel at the same time. This loads and moves the grease. Then back off one flate and fit split pin. This method appears to work better.
    Thanks Jon - very useful information.
    Crendon Chassis No.49
    Huddart FE428 + toploader

    Not listed in the Shelby Register.

  9. #9
    Join Date
    Mar 2017
    Location
    Alton, Hampshire
    Posts
    65
    Help please.

    I have successfully fitted my first of Simon's hubs on the front stub axle. All went well with new bearing, etc, but I do have one problem I don't understand. How on do I get the split cotter pin through the castle nut and stub axle???
    Jon LR

    Magnum with Ford 302ci & 4 speed Toploader

  10. #10
    Join Date
    Jan 2006
    Location
    Chelmsford Essex
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    1,050
    From the forum. Hope this helps. Looks the standard way of the castle cover and split pin.
    Attached Images Attached Images
    Dax 351 Cleveland T5 2.88 PL

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