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Thread: Harmonic propshaft noise

  1. 6th April 2009, 07:40 AM #1
    Scallops's Avatar
    Scallops
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    Harmonic propshaft noise

    Hello Folks,

    I started to hear a new noise in my 07 defender over the last 1000 odd kms - best described as a "Grooing" sound. It only happens below 60km/h.

    MR automotive have diagnosed this as a harmonic propshaft vibration occurring at speeds under 60km/h. I had to take it to MR to find out what was wrong as Southside LR said there was no unusual noise in the vehicle when I took it to them - but you know, when it's your vehicle and you drive it all the time, you easily pick something wrong or different.

    I'm taking it back to the dealer (Austral) later this month now that MR have confirmed an issue, but was wondering how such a noise can suddenly happen - it began in the last thousand km's.

    I've had a good look at the prop shafts and they don't appear to have been damaged in any way - and I can't see anything missing etc, nor could MR.

    Makes me wonder how such things just develop? And what can be done to eliminate harmonic noises/vibrations - balancing? replacement?
    2007 Defender 110
    2017 Mercedes Benz C Class. Cabriolet
    1993 BMW R100LT
    2024 Triumph Bonneville T120 Black
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  2. 6th April 2009, 10:30 AM #2
    mike 90 RR Guest
    Your description is familiar to my symptoms

    Can be a combination of

    Lack of grease in Uni's ... Excessive free play from the bearing of the front output shaft of the T/C box .. Twisted propshaft

    Basically ... Take the propshaft off ... see if there is a difference

    Try / borrow a known good one ..... see if there is a difference


    Are you saying that you have a noise ... but no vibration??





    By the way ... Welcome to my world
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  3. 6th April 2009, 10:38 AM #3
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    Quote Originally Posted by mike 90 RR View Post
    Your description is familiar to my symptoms

    Can be a combination of

    Lack of grease in Uni's ... Excessive free play from the bearing of the front output shaft of the T/C box .. Twisted propshaft

    Basically ... Take the propshaft off ... see if there is a difference

    Try / borrow a known good one ..... see if there is a difference


    Are you saying that you have a noise ... but no vibration??





    By the way ... Welcome to my world
    Hello mike - yes, I have a noise but no vibration. Vehicle is under warranty so the dealer can just fix it (I hope) .

    It is just annoying more than anything.

    The shaft has been fully checked and lubed - and as it is under warranty, I don't want to mess with it should I void the warranty.
    2007 Defender 110
    2017 Mercedes Benz C Class. Cabriolet
    1993 BMW R100LT
    2024 Triumph Bonneville T120 Black
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  4. 6th April 2009, 11:29 AM #4
    mike 90 RR Guest
    Quote Originally Posted by Scallops View Post
    I don't want to mess with it should I void the warranty.

    Put the car on axle stands ... all 4 wheels off the ground ... Then drive it static at that sub 60 kph and hear if the sound appears ... If it does, then you will be able to

    A ... hear all the noises of the drive train
    B ... see & hear the offending part ... and know it's not your imagination
    C ... Teach the dealer on how to find & identify faults properly

    Jerks me off when a mechanic pronounces "can't hear a thing mate" ... So hopefully this will "Checkmate" them


    Hope it helps



    PS ... I have the vibration at sub 60 ... but no noise ... and mine is RRC

    Mike
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  5. 6th April 2009, 12:20 PM #5
    mike 90 RR Guest
    ... Isn't Dave just around the corner? ...
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  6. 6th April 2009, 01:07 PM #6
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    Scallops
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    Quote Originally Posted by mike 90 RR View Post
    ... Isn't Dave just around the corner? ...
    Yep - if he sees this and volunteers I'll go see him.

    Thanks for your advice though - I can see myself up on the ramps - then, when somehow I fall off the ramps, I fly through the fence cartoon style into the neighbour's yard with the Defender shape cutout into the fence.
    2007 Defender 110
    2017 Mercedes Benz C Class. Cabriolet
    1993 BMW R100LT
    2024 Triumph Bonneville T120 Black
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  7. 6th April 2009, 01:42 PM #7
    mike 90 RR Guest
    Quote Originally Posted by Scallops View Post
    I can see myself up on the ramps
    .... CAR RAMPS?? .... ...Noooooooooooooooooooo

    I said AXLE STANDS ....

    ... Go see Dave before you .... fly through the fence cartoon style .... with the Defender shape cutout into the fence.

    Mike

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  8. 6th April 2009, 01:56 PM #8
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    Quote Originally Posted by mike 90 RR View Post
    .... CAR RAMPS?? .... ...Noooooooooooooooooooo

    I said AXLE STANDS ....

    ... Go see Dave before you .... fly through the fence cartoon style .... with the Defender shape cutout into the fence.

    Mike

    Woops! Axle stands, axle stands, axle stands...
    2007 Defender 110
    2017 Mercedes Benz C Class. Cabriolet
    1993 BMW R100LT
    2024 Triumph Bonneville T120 Black
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