mudmagnet Posted July 8, 2015 Share Posted July 8, 2015 Hi I have a 300tdi auto and recently at certain speeds there is a droning vibration when i lift off the throttle but when under power it's fine the props are ok with no play and I can't find anything loose also when almost coming to a halt there's a few clunky cracky sounds is this likely to be the flex plate Thanks Quote Link to comment Share on other sites More sharing options...
hangover Posted July 9, 2015 Share Posted July 9, 2015 Sounds like rotoflex coupling or front prop uni's , flex plate problem should be evident with engine running at all speeds. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 9, 2015 Share Posted July 9, 2015 You will hear flex plate out of gear at idle, and when revving, so doubt it is that, does indeed sound like drivetrain. Quote Link to comment Share on other sites More sharing options...
mudmagnet Posted July 9, 2015 Author Share Posted July 9, 2015 No play in prop uj's and no rubber donut on rear 200 prop fitted Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 9, 2015 Share Posted July 9, 2015 Transfer box output? Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted July 9, 2015 Share Posted July 9, 2015 Check the bushes on both axles. ... could be the front hockey stick bushes allowing the axle to rotate as you brake to a halt making the diff angle change. ....you'd be surprised how much they can move even if in good condition! ! Quote Link to comment Share on other sites More sharing options...
Boydie Posted July 9, 2015 Share Posted July 9, 2015 As per Disco-Ron's comment, replace the standard radius arm bushes with Range Rover Classic items - double core and stiffer. Oh, and start listening to the Beach Boys while you're driving - that way you get some "Good Vibrations" Quote Link to comment Share on other sites More sharing options...
mudmagnet Posted July 16, 2015 Author Share Posted July 16, 2015 It seems to be the viscous fan which is quite worn it must of been vibrating at certain revs I have taken it off for now and the bad vibration has gone what is a good replacement viscous unit as britpart/bearmach/allmakes all seem about the same price so I'm sure they are all made by the same manufacturer Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted July 17, 2015 Share Posted July 17, 2015 It seems to be the viscous fan which is quite worn it must of been vibrating at certain revs I have taken it off for now and the bad vibration has gone what is a good replacement viscous unit as britpart/bearmach/allmakes all seem about the same price so I'm sure they are all made by the same manufacturer An Electric fan perhaps as it is not needed all the time. Quote Link to comment Share on other sites More sharing options...
Sheffield Posted July 17, 2015 Share Posted July 17, 2015 Our 96 auto has not had a fan on for years. I did fit an electric fan made from an air conditioner fan and manually switched on in case it should need some thing, but I have never had to use it. I think they only need a fan if stuck in very heavy traffice on a very hot day, provided the cooling system is in good order of course. I did have a droning sort of vibration once that I could not seem to cure. I eventually found the exhaust downpipe had a number of very small holes where it had been welded along the length fo form a tube. Not big enough to make a blowing exhaust sound, but just enough to make a buzzing droning sound at certain speeds. Quote Link to comment Share on other sites More sharing options...
mudmagnet Posted July 18, 2015 Author Share Posted July 18, 2015 For the moment I'm going to run without the fan Quote Link to comment Share on other sites More sharing options...
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