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Thread: Diff Specifications

  1. 14th January 2011, 08:40 PM #1
    Jock The Rock
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    Exclamation Diff Specifications

    Gday

    Planning on fitting my front locker tomorrow, starting at 8 am

    With a full rebuild while I'm at it (new bearings etc.)

    Only trouble is I don't have any specifications. I have a 1996 Defender Workshop Manual, a Haynes Manual and to Rave CDs and none of them will give me specs on the front diff

    (24 spline front Landrover diff)

    Does anyone have some?
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  2. 15th January 2011, 06:11 AM #2
    Jock The Rock
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    Can anyone help?
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  3. 15th January 2011, 07:32 AM #3
    Chris Commins
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    1995 manuals

    Jock, I have the same 110 as you and have had problems finding a comprehensive manual or details for that model. So far i have just had to make do with manuals newer or older.
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  4. 15th January 2011, 10:11 AM #4
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    Quote Originally Posted by Jock The Rock View Post
    Can anyone help?
    Jock, if you dont have the specs or tools to setup the backlash and proper wear pattern take the centre to a diff specialist, it shouldn't cost too much, I'm a mechanic and I still send my diff centers off to an expert, pays to be sure, Regards Frank.
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  5. 15th January 2011, 11:07 AM #5
    wagoo
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    If your diff is otherwise in good condition and you are just fitting a difflock and not a new crownwheel and pinion, just measure the present crownwheel to pinion backlash prior to dismantling and replicate that measurement when you reassemble.Changing the backlash from previous settings on a diff in good condition is almost guaranteed to cause it to humm.Bearings these days are very precise, so fitting new ones to the pinion should not alter the factory pinion height settings.
    Wagoo.
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  6. 15th January 2011, 05:11 PM #6
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    rovercare
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    Quote Originally Posted by wagoo View Post
    If your diff is otherwise in good condition and you are just fitting a difflock and not a new crownwheel and pinion, just measure the present crownwheel to pinion backlash prior to dismantling and replicate that measurement when you reassemble.Changing the backlash from previous settings on a diff in good condition is almost guaranteed to cause it to humm.Bearings these days are very precise, so fitting new ones to the pinion should not alter the factory pinion height settings.
    Wagoo.
    Give this man a prize
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  7. 15th January 2011, 05:12 PM #7
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    rovercare
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    Quote Originally Posted by Tank View Post
    Jock, if you dont have the specs or tools to setup the backlash and proper wear pattern take the centre to a diff specialist, it shouldn't cost too much, I'm a mechanic and I still send my diff centers off to an expert, pays to be sure, Regards Frank.

    Why? its an easy job if your mechanically astute

    I do heaps of diff's, including crown wheel and pinion changes, just need a few dolly's for pinion height and a mag based dial

    And I'm just a dumb sparky
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  8. 16th January 2011, 10:53 AM #8
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    Quote Originally Posted by rovercare View Post
    Why? its an easy job if your mechanically astute

    I do heaps of diff's, including crown wheel and pinion changes, just need a few dolly's for pinion height and a mag based dial

    And I'm just a dumb sparky
    If you dont have a mag based dial and a torque wrench then the cost of these would be equal to paying the expert and I cant be bothered, my mate does mine for $50 and I have a mag based dial and torque wrench, Regards Frank.
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  9. 16th January 2011, 05:50 PM #9
    Jock The Rock
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    My front diff wasn't particularly healthy. It was turning fresh oil silver after 2000km

    We replaced all bearings and fitted the new carrier, that's why I was chasing specs
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  10. 17th January 2011, 08:44 AM #10
    wagoo
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    Quote Originally Posted by Jock The Rock View Post
    My front diff wasn't particularly healthy. It was turning fresh oil silver after 2000km

    We replaced all bearings and fitted the new carrier, that's why I was chasing specs
    If it was that bad and you are still using the old crownwheel and pinion, just give it .010'' backlash.You probably won't get a readable contact pattern anyway.
    Does your manual describe how to preload the carrier and pinion bearings ? Haynes manual s are useless?
    Wagoo.

    Edit. For what it may be worth to you,or anyone else, the pinion height, from centre of carrier bearing bore to face of pinion is a nominal 3''
    A straight ground shaft layed across the carrier bearing saddles, a block 1.490'' high sat on the face of the pinion plus a .010'' feeler gauge used to do the trick for the earlier diffs with imperial 3'' dia carrier bearings. I had an extra shim spacer for the height block for diffs with later metric bearings, but don't have access to it to measure right now, so you'll have to calculate the difference.
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