bwall027
Member Since: 10 Nov 2010
Location: Bristol
Posts: 46
  
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| clunk clunk clunk from drivetrain in reverse |
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having just replacing an unrepairable epb and compressor, plus needing to do cambelt, the last thing I needed was something else which sounds expensive to go wrong  .....
when reversing, I have a loud regular 'clank, clank clank' - a regular noise in time with propshaft revolving. It sounds similar to a knackered CV joint, but I don't think it is given seems to more be coming from front or rear propshaft/transfer box area and it seems to make no difference if the steering wheel is turned or not.
I actually had it roughly a year ago, but it mysteriously went away after I did a bit of fiddling when trying to work out what it was, it's a lot worse now however.
I have changed diff and transfer box oils and there was no sign of unwanted metal fragments in the oil.
it only does it under load, if you coast backwards there is nothing. It occasionally will make the same noise in a forward gear at low speed, but not so loud.
I also have the constant whirr of a bearing that's failing but has not gotten any worse over 12 months plus, I suspected a wheel bearing (there's no play) but it could be a symptom of the same problem.
the car is an 07MY, manual and has done 89K.
any thoughts other than systematically replacing diff, transfer box, driveshafts, propshafts - obviously a list of rather expensive items to try out!
thanks
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 10th Jan 2014 1:47 pm |
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nighthawk
Member Since: 24 Jul 2010
Location: Malta
Posts: 1163
 
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Have a look at the centre bearing on the rear propshaft. It is quite common for the rubber bit to part ways with the rest of the shaft leaving a propshaft which can flex in the centre. Might not be the cause of your noise but it costs nothing to check Dennis
2006 Discovery 3 TDV6 Commercial Manual Buckingham Blue
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| 10th Jan 2014 1:50 pm |
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bwall027
Member Since: 10 Nov 2010
Location: Bristol
Posts: 46
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thanks Nighthawk
I did have a look at the propshaft bearing when I had heat shield off changing the EPB just before Christmas. There was what seemed a lot of play in the rubber, but otherwise looked ok.
I do have a little fore/aft play in the front propshaft but that 'feels' as though it should be normal?
cheers
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| 10th Jan 2014 2:46 pm |
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bwall027
Member Since: 10 Nov 2010
Location: Bristol
Posts: 46
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| FIXED - replaced front propshaft |
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in case anyone else is experiencing the same issue in future... this was the bearing joint in the transfer box end of the front prop shaft, which had dried out due to a hole in the rubber boot, which was not visible until removing the prop shaft from the vehicle (when the coupling fell to pieces!) - there is a large 6 ball cage bearing inside.
Incidentally, the easiest way to get the prop shaft in/out was over the cross member by undoing the transfer box mount and jacking up the gearbox/transfer box, then squeeze it between the transfer box casing and exhaust bracket.
Also, in regard to separating the prop shaft from the diff / transfer box once the bolts were removed... Assuming you have a replacement shaft and can therefore afford to damage the existing one (although it doesn't take much) I found the easiest way to do so was to gently tap the coupling hub out of the shallow sleeve on the transfer box/diff mounting using a chisel and mallet - do a little one side, then rotate the shaft 180 degrees and tap out the other side, should come out quite easy and not need much force.
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| 27th Jan 2014 2:37 pm |
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