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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8072
  
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By “very tight” one assumes you mean the centre bearing, if that’s so slacken it off very slightly or better still can you make some very thin shims(0.010”) to pack the centre bearing away from the body and try it, it seems to me when you torque it up you are putting pressure on the rear UJ and diff bearing.
The other alternative is to return the prop shaft as faulty if you can. It can when others can't,
It will when others won't,
It goes where others don't.
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 27th Sep 2022 3:46 pm |
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Astor
Member Since: 06 Apr 2016
Location: Stockholm
Posts: 10
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There is a slight difference in vibrations due to the play in the center bearing mount. I can move it about 5 mm towards and away frpm the body. Max away makes less vibrations. In that positions the rear (longer) parts of the prop is more in line with the frame, less angle to the rear diff.
I have kept the old prop shaft. Thinking of a new center bearing and replace the old prop. But then I am back with old joints in back and front.
it´s hard to tell if the new prop is unbalanced, but it will sure stress the bearings.
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| 30th Sep 2022 2:03 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8072
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Surely there shouldn’t be any play in the centre bearing mount? It can when others can't,
It will when others won't,
It goes where others don't.
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| 30th Sep 2022 4:00 pm |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
  
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Astor wrote:There is a slight difference in vibrations due to the play in the center bearing mount. I can move it about 5 mm towards and away frpm the body. Max away makes less vibrations. In that positions the rear (longer) parts of the prop is more in line with the frame, less angle to the rear diff.
I have kept the old prop shaft. Thinking of a new center bearing and replace the old prop. But then I am back with old joints in back and front.
it´s hard to tell if the new prop is unbalanced, but it will sure stress the bearings.
I will bet you a pint that the rear u/j on the old prop will be notchy and this makes it scrap, why they ever used a std u/j on a fixed joint I have no idea.
It sounds to me like your new prop has issues.
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| 1st Oct 2022 1:32 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8072
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I’ve no idea why they don’t fit a grease nipple in the centre of the UJ like they do on most agricultural UJ joints.  It can when others can't,
It will when others won't,
It goes where others don't.
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| 1st Oct 2022 8:31 am |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
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It is not that simple, a u/j needs to move through a certain minimum arc otherwise (cannot remember the correct terminology) it sort of gets stuck in that one position, and as the d3/4 diff does not move the only movement it gets is from the centre bearing rubber.
Same as 3rd angles are meant to be bad for the prop life expectancy, much the same as prop phasing.
There is a whole science to props and the u/js, which I confess to knowing very little.
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| 1st Oct 2022 7:46 pm |
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Astor
Member Since: 06 Apr 2016
Location: Stockholm
Posts: 10
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The prop shaft went from bad vibrations to bad noise and then broke after just a few miles. It was the front end joint throwing out grease and the jammed. I am done with aftermarket products, it´s OEM from now on.
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| 10th Oct 2022 3:46 pm |
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Jabba6602
Member Since: 25 May 2015
Location: Exeter
Posts: 20
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I had the same issue, found watery oil in the rear diff had damaged drive shaft support needle bearing fitted a new diff, no noise!!!
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| 27th Feb 2023 5:26 pm |
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