Poropshaft Rebalancing

Discussion in 'Mercedes' started by Gman1969, Oct 11, 2012.

  1. Gman1969

    Gman1969 Read Only Funster

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    Hello Everyone,

    I am slowly getting all the issues fixed with my 410D base! My next issue I think is related to an out of balance propshaft. I get a low vibration when accelerating from say 10mph to 30mph depending on the revs and get a judder through the pedal, floor and steering column which feels like it is coming from behind me. When I take my foot off the gas it goes away and when I am freewheeling down hill, but comes back in again when I put my foot on the gas. I also have a point when slowing down that I can hear/feel a slight vibration behind me, i.e. no foot on the gas but it is at a pretty narrow speed range say 10-15mph. At speed say over 50mph I also have a high speed buz which seems to excite the table and the hob cover to vibrate and generally gets on my nerves. I have checked the temperature of the prop shaft after a long run and it is not hot to the touch so I guess the CV joints are ok but I can see that some of the weights or strips of metal on the prop shaft have come away and others are peeling off. I also have an auto gearbox. Does this sound like a prop shaft out of balance probem?

    Thanks for any help!v:Sad:

    Gareth
     
    Last edited: Oct 11, 2012
  2. jhorsf

    jhorsf Read Only Funster

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    It is usually the uj's that need replacing
     
  3. vwalan

    vwalan Funster

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    hi you could try playing with a jubilee clip where you think the weights have come off . sometimes the thread bit tricks the balance . or try small coins under the clip.
    we used a place in balham for staked in vw propshaft joints they balanced them there as well .but explained about the coin, clip system it can work . trial and error though.
     
  4. jhorsf

    jhorsf Read Only Funster

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    I have read that the flywheel will give you these symptoms
     
  5. Gman1969

    Gman1969 Read Only Funster

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    Hi jhorsf/vwalan,

    a flywheel that sounds like an expensive remedy. I have no idea how I would go about proving if it was balance, uj or the flywheel. All I can see by inspection only are the missing welded weights along the propshaft. How would we find out or is it a case of balance the propshaft first and during that process if the uj's are buggered replace them and then finally by elimination the flywheel?

    I wonder how we fault find and remedy without fixing something unnecessary. I have had this problem since I bought the van 6 years ago but the vibration has got worse these last few months.

    I guess the obvious question is how do I check the UJ's first? I could try clipping on coins with a jubilee clip to see if it the vibration changes and that is a good idea :RollEyes:

    Cheers,

    Gareth
     
  6. pappajohn

    pappajohn Funster Life Member

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    as it is more pronounced under load then i would say the UJ's are worn.

    if it was the shaft it would vibrate whether under load or not, moreso at a particular speed.

    easiest way to check UJ's at home is remove the shaft and feel the joints for play when twisting, pulling and pushing in a straight line and roughness when moved around its axis....there should be none of either in a healthy joint
     
    Last edited: Oct 11, 2012
  7. Gman1969

    Gman1969 Read Only Funster

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    thanks pappajohn, how do I check the uj's?
     
  8. Gman1969

    Gman1969 Read Only Funster

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    Another thing. When I put my foot rapidly on the accelerator I do get a clunk as the transmission engages. I also get it when in reverse. What could that be?
     
  9. pappajohn

    pappajohn Funster Life Member

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    UJ's taking up the play.
     
  10. pappajohn

    pappajohn Funster Life Member

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    checking UJ's...see my previous post :thumb:
     
  11. vwalan

    vwalan Funster

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    that clunk could be the diff needs adjusting . or could be uj,s . a good garage will soon find the fault .
    it startedwith you being able to see where weights had dropped off . it could be that you just need to play putting some back. you could take the prop off get it to an engineering works and say balasnce or fix it . if weights are off they will spin it up and tell you yes it needs weights or it needs uj,s .
    if the joints are clipped in its possible to do it yourself . but if you havent ever done one might be easier to let them .
    heres doing it on the free camp in morocco. dodge 50 bus . cost 12 quid for new hardy spicer joints there .for both . luckily we knew how to do it.
     

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  12. pappajohn

    pappajohn Funster Life Member

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    [​IMG]


    thats one hell of a way to do repairs Alan........

    prop shaft, 'spicer' bearings, tools and vice sat in sand and dust :Doh:

    the least they could do was lay down a blanket and work off that.
     
    Last edited: Oct 11, 2012
  13. vwalan

    vwalan Funster

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    that s me .bob ,and gary that lives next to me here. bob was very gratefull we could do it . it worked . beggers cant be choosers in the desert .
    bob bust his wrist the next year . had it plastered up in dakla for hundred quid . i cut the plaster off in spain 6 weeks later . we can fix most things if we have to .
    survival is all you need . :thumb:
     
  14. vwalan

    vwalan Funster

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    dont know what was worse fixing bobs propshaft or welding my springs up that year.
    bobs prop was fixed in the south later we took the track up dardes gourge . i bust my springs on the way down . but we made it . welded two in tinerhir .anotherup by al hoceima.
    got 4 new ones made in malaga . what a year that was . life isnt easy.
     

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  15. Gman1969

    Gman1969 Read Only Funster

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    Wow that is what I call on the job repairs! I will take it to my local garage and have them check the Uj's for me. I will also take the mechanic for a spin so he can hear it and let him have a go at fixing the problem.

    I will keep you all informed and I hope it is UJ's :Eeek:

    Thanks,

    Gareth
     
  16. vwalan

    vwalan Funster

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    yes ever one is always interested . might help someone else one day . we try to be helpful .
     
  17. jhorsf

    jhorsf Read Only Funster

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    UJ's are a common problem on the merc and are easy to test

    [ame="http://www.youtube.com/watch?v=dlnAbshguZI"]Replacing a Rear Axle U Joint : How to Inspect U Joints - YouTube[/ame]

    [ame="http://www.youtube.com/watch?v=2exhpLxmlgA&feature=related"]Bad U-Joint - YouTube[/ame]


    if replaceable joints this may help

    http://www.youtube.com/watch?feature=endscreen&v=rOEdul7nscY&NR=1
     
  18. pappajohn

    pappajohn Funster Life Member

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    the clunk you hear is shown in the second video clip...the two 'yolks' banging together.......but that is a real bad one and would be noisy well before its that worn.
     
  19. rainbow chasers

    rainbow chasers Read Only Funster

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    Defo sounds like U/J's - they are easy to fit.

    Hold the prop and joint in each had and try to rotate against each other, there should be no 'play' in the joint itself. Check the donut also, as if you have a seized joint, then it usually wears the donut (centre bearing) as well.

    Joints should be greased weekly using a grease gun when in daily use, get away with monthly on a motorhome.
     
  20. Gman1969

    Gman1969 Read Only Funster

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    Thanks everyone all the information and especially the youtube vids have been very useful. Anyone know of any good garages that can do this in the Gwynedd area?

    Thanks,

    Gareth
     

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