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Thread: D1 diff centralising pin

  1. 4th September 2014, 09:34 PM #1
    phibbzy's Avatar
    phibbzy
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    D1 diff centralising pin

    I pulled the rear prop shaft on a D1 today in search for a persistent (100% of the time) wobble from 90kmph up seemingly emanating from the rear end. The centralising pin fell out - which is apparently not intended...

    What are these holes on the part??

    Clearly the pin needs replacing, should the flange be replaced as well. The seal is leaking (more evidence that the wobble is from this area) so that has to be done anyway... Might just answer that one myself in the affirmative but I am curious as to what the holes are or what they indicate.

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  2. 4th September 2014, 10:39 PM #2
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    I tend to think the wear would be divided between the centralising spigot and the flange. I'd change both. It should be an interference fit.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
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  3. 5th September 2014, 08:10 AM #3
    workingonit
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    There's a spiral pattern evident. Wonder if the flange bolts were lose at some stage. Some sort of rotational stress, gradually popping metal as divots, that will eventually join up? Brinelling?

    Might be related - try this pdf link. It discusses spiral, straight and mottled wear chatter when facing grinding stones.

    [ame]http://abrasiveengineering.com/temp/Troublsh.pdf[/ame]
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  4. 5th September 2014, 08:48 AM #4
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    Haha, I recognise those marks! They are the remains of centre punch marks used to upset the metal and repair a loose fitting pin. Obviously it failed again as it fell out. The mechanic shoulda used some Loctite 620 on it too.Time for a new flange and pin.
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  5. 5th September 2014, 10:27 AM #5
    workingonit
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    Would the mechanic have been better putting on some spot welds for all the trouble of punching it?
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  6. 5th September 2014, 11:00 AM #6
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    Quote Originally Posted by workingonit View Post
    Would the mechanic have been better putting on some spot welds for all the trouble of punching it?
    Mechanic and weld are two words that don't normally go together.
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  7. 5th September 2014, 11:59 AM #7
    workingonit
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    Probably explains the ball joint welded to the swan neck of the steering rod on my RRC
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  8. 5th September 2014, 12:22 PM #8
    chopper
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    Quote Originally Posted by isuzurover View Post
    Mechanic and weld are two words that don't normally go together.
    Really ?
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  9. 5th September 2014, 01:04 PM #9
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    Quote Originally Posted by chopper View Post
    Really ?
    A mechanic generally does not do any welding as part of their apprenticeship, nor are they qualified to once they have their ticket. The parts a mechanic is trained to work on are generally bolted or screwed on.
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  10. 5th September 2014, 02:24 PM #10
    workingonit
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    ...seems they can also belt things
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