Niamh Posted April 4, 2010 Share Posted April 4, 2010 Having taken the precaution of replacing the RH front 1/2 shaft and CV joint which had some rotational play the vibration is still there. It only starts at about 35MPH and is only there under power. The front propshaft UJs are plat fess, there is only the bit of pay into the transfer box & front diff. The rear doughnut is a bit cracked (see pictures ) but is it bad enough to cause a vibration? Niamh Quote Link to comment Share on other sites More sharing options...
Fantic Posted April 5, 2010 Share Posted April 5, 2010 It could be .. but it's a swap-out to check ... Cheap enough to replace and keep the cracked one in the spares box for when you (or a companion) break one while off-roading/green-laning. Quote Link to comment Share on other sites More sharing options...
sargejnr Posted April 5, 2010 Share Posted April 5, 2010 i have just over come vibration under load on my disco, i took the front prop off and took it for a run, if it was that prop it wouldnt vibrate, as it turns out it was that one and i then found slight play in one of the uj's, if it hadnt been that i would have put the front one on again and done the same with the rear prop, hope that helps Quote Link to comment Share on other sites More sharing options...
rope runner Posted April 5, 2010 Share Posted April 5, 2010 Have you checked the rear radius arm front and rear bushes movement in these under power allows the axle to run out of line giving same symptoms as prop uj Quote Link to comment Share on other sites More sharing options...
Niamh Posted April 5, 2010 Author Share Posted April 5, 2010 i have just over come vibration under load on my disco, i took the front prop off and took it for a run, if it was that prop it wouldnt vibrate, as it turns out it was that one and i then found slight play in one of the uj's, if it hadnt been that i would have put the front one on again and done the same with the rear prop, hope that helps After fixing the CV joint/halfshaft propshafts have to be the next thing to try, the question is which one to start with... Niamh Quote Link to comment Share on other sites More sharing options...
white90 Posted April 5, 2010 Share Posted April 5, 2010 Is the vibration very bad? I'll stick my neck out and say it won't be CVs or halfshafts. props/wheel balance/bushes is where I'd be looking is the car modified in any way? can you get someone else to go in the car with you to see if they can help ID it? I spent ages and money looking for it on my defender it was the castor corrected arms I had fitted that made the original prop vibrate on overrun. Quote Link to comment Share on other sites More sharing options...
Niamh Posted April 6, 2010 Author Share Posted April 6, 2010 Is the vibration very bad? No, if it was the source might be easier to locate is the car modified in any way? 2" lift, and the vibe only started 6 months after the current wheels/tyres were fitted... can't have thrown a weight as they went on unbalanced. can you get someone else to go in the car with you to see if they can help ID it? My husband's been out with me can't even roughly locate a source Niamh Quote Link to comment Share on other sites More sharing options...
Fantic Posted April 6, 2010 Share Posted April 6, 2010 I'd check wheelbearing play. Jack an axle up, undo the half shaft endcaps and see if there's any 'wobble' in the hubs. I say remove the endcaps because I had an issue in that a wheel bearing collapsed, but with the wheel on and endcap still tight there was no play at the wheel! ... Only when I undid the endcap did the hub drop revealing the problem, which I'm still working on as it only happened a couple of days ago and the half-shaft won't come out! Quote Link to comment Share on other sites More sharing options...
Wheels244 Posted April 6, 2010 Share Posted April 6, 2010 I had the same problem, but mine started at 50mph. My doughnut was cracked, probably a bit worse than yours. I changed the prop for a spare I had with new doughnut and it cured it. Top tip, buy a GKN doughnut, not a cheap one off ebay or you'll be replacing it sooner rather than later. Quote Link to comment Share on other sites More sharing options...
iandouglas Posted August 17, 2010 Share Posted August 17, 2010 I had the same problem, but mine started at 50mph. My doughnut was cracked, probably a bit worse than yours. I changed the prop for a spare I had with new doughnut and it cured it. Top tip, buy a GKN doughnut, not a cheap one off ebay or you'll be replacing it sooner rather than later. DONT FORGET THERE IS A NYLON BUSH INSIDE THE END OF PROP SHAFT . IT FITS OVER SPIGOT ON DIFF FLANGE IF DOUGHNUT HAS WORN BAD THEN THE BUSH WILL ALSO BE WORN ALLOWING PROP TO MOVE OFF CENTRE INCREASED PRESSURE ON DOUGHNUT SO WILL FAIL SOONER. DONT ASK HOW I KNOW. Quote Link to comment Share on other sites More sharing options...
western Posted August 17, 2010 Share Posted August 17, 2010 Please type with lowercase, upper case is considered to be shouting on forums. Quote Link to comment Share on other sites More sharing options...
iandouglas Posted August 17, 2010 Share Posted August 17, 2010 Sorry western. But i wished someone had shouted it from the roof tops ,would have saved me a lot of extra work.lol Quote Link to comment Share on other sites More sharing options...
scatt Posted August 17, 2010 Share Posted August 17, 2010 If your going to replace the doughnut, why not swap the prop for a 200 series prop as they have no doughnut and so no future proplems from it?? Quote Link to comment Share on other sites More sharing options...
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