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Thread: Bad Vibrations

  1. 22nd February 2008, 04:25 AM #1
    nzoliver's Avatar
    nzoliver
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    Unhappy Bad Vibrations

    Howdy all, Something to ponder.....

    I have a harsh vibration under medium to hard acceleration at 55km/h (31MPH) and it comes in again at 100Km/h (62MPH). SO far we have tried this to no avail:

    Remove rear prop shaft - problem stays
    Remove front shaft - problem gone
    Install brand new front shaft - no difference
    Dissasemble and check centre diff - all just fine
    Dissasemble front diff - all fine
    Checked both CVs and front wheel bearings - all fine
    Changed the wheels for some from another vehicle - no difference
    Put the truck on a hoist and run it up to 55 - transfer case starts shaking - engage diff lock and the problem is almost gone.

    Where to next??
    Any clues?? It is a '98 300Tdi with 80000km.
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  2. 22nd February 2008, 05:45 AM #2
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    Blknight.aus
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    Quote Originally Posted by nzoliver View Post
    Howdy all, Something to ponder.....

    I have a harsh vibration under medium to hard acceleration at 55km/h (31MPH) and it comes in again at 100Km/h (62MPH). SO far we have tried this to no avail:

    Remove rear prop shaft - problem stays
    Remove front shaft - problem gone
    Install brand new front shaft - no difference
    Dissasemble and check centre diff - all just fine
    Dissasemble front diff - all fine
    Checked both CVs and front wheel bearings - all fine
    Changed the wheels for some from another vehicle - no difference
    Put the truck on a hoist and run it up to 55 - transfer case starts shaking - engage diff lock and the problem is almost gone.

    Where to next??
    Any clues?? It is a '98 300Tdi with 80000km.
    ding ding ding ding ding....

    WE have a winner.

    Flogged, siezed or otherwise not happy UJ, slip joints flogged out or the shaft has thrown a weight and is now out of balance.

    Its rare but it could aslo be the output flange on the Tcase is out of true, slopping on its splines or the front bearing is on the way out.

    have fun, dont keep driving it if the UJs aint happy, thrown front propshafts Aint exactly fun.
    Dave

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  3. 22nd February 2008, 05:56 AM #3
    Graeme
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    Check that the handbrake drum isn't out of round by really backing-off the shoes.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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  4. 22nd February 2008, 08:22 AM #4
    jmkoffice
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    Quote Originally Posted by nzoliver View Post
    Howdy all, Something to ponder.....

    I have a harsh vibration under medium to hard acceleration at 55km/h (31MPH) and it comes in again at 100Km/h (62MPH). SO far we have tried this to no avail:

    Remove rear prop shaft - problem stays
    Remove front shaft - problem gone
    Install brand new front shaft - no difference
    Dissasemble and check centre diff - all just fine
    Dissasemble front diff - all fine
    Checked both CVs and front wheel bearings - all fine
    Changed the wheels for some from another vehicle - no difference
    Put the truck on a hoist and run it up to 55 - transfer case starts shaking - engage diff lock and the problem is almost gone.

    Where to next??
    Any clues?? It is a '98 300Tdi with 80000km.
    800,000 km......Hmmm
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  5. 22nd February 2008, 09:07 AM #5
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    Quote Originally Posted by nzoliver View Post
    Howdy all, Something to ponder.....

    I have a harsh vibration under medium to hard acceleration at 55km/h (31MPH) and it comes in again at 100Km/h (62MPH). SO far we have tried this to no avail:

    Remove rear prop shaft - problem stays
    Remove front shaft - problem gone
    Install brand new front shaft - no difference
    Dissasemble and check centre diff - all just fine
    Dissasemble front diff - all fine
    Checked both CVs and front wheel bearings - all fine
    Changed the wheels for some from another vehicle - no difference
    Put the truck on a hoist and run it up to 55 - transfer case starts shaking - engage diff lock and the problem is almost gone.

    Where to next??
    Any clues?? It is a '98 300Tdi with 80000km.
    Quote Originally Posted by Blknight.aus View Post
    ding ding ding ding ding....

    WE have a winner.

    Flogged, siezed or otherwise not happy UJ, slip joints flogged out or the shaft has thrown a weight and is now out of balance.

    Its rare but it could aslo be the output flange on the Tcase is out of true, slopping on its splines or the front bearing is on the way out.

    have fun, dont keep driving it if the UJs aint happy, thrown front propshafts Aint exactly fun.
    Two dud front prop shafts?

    Cheers
    Simon
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  6. 22nd February 2008, 02:56 PM #6
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    Hi Graeme - Ran it without a brake drum to eliminate that!
    Hi Simon - New shaft turned 'in phase' not out of 'phase'. I wonder if it was ballanced in phase and moving it to out of phase has shifted the ballance? UJs feel just fine on the old shaft.
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  7. 22nd February 2008, 03:28 PM #7
    Graeme
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    Gearbox mounts or less likely, engine mounts?
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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  8. 22nd February 2008, 03:33 PM #8
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    Panhard or Radius bushes completely shot or all bushes??????


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  9. 22nd February 2008, 04:17 PM #9
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    Howdy
    How would you tell?
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  10. 22nd February 2008, 06:41 PM #10
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    ive posted this on another thread, and i have no idea why the front prop shaft on discos and fenders have the uni yokes misaligned. they should be aligned flat, because in a mechanical sense, unis at both ends of a shaft that have the unis misaligned causes massive vibration. Yet this is how they all come from they factory.
    I split mine at the spline, and reassembled it with the uni's aligned flat, and it drove heaps better, allowing higher top end speed, but i still had some vibration due to the flogged bearing inside the output flange.
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