RobIsaacson Posted December 14, 2006 Report Share Posted December 14, 2006 Hi All Where shall I start.... Replaced both rear hubs and lowered springs all round (1" lower). Replaced trailing arm brackets and bushes. Lots of new nuts and bolts. Checked wheel alignment with Daniel (in Hemel) yesterday (really nice bloke), all sorted. Got bad vibrations!?!? Appears to be coming from the rear When i refitted the diff I lined up the marks I put on the shaft but thinking about it - were there any other marks I could have mistakenly lined up? will need to check this as well! Not got it on the ramps yet but is there anything obvious I should look at first? All thoughts / comments gratefully accepted Gives me something to do over xmas (as if I didn't have anything else to do) Many thanks Rob Quote Link to post Share on other sites
daniel p Posted December 14, 2006 Report Share Posted December 14, 2006 ok check the obvious first, are the tyres round with no bulges in the tread, run your had over the tread any vibration inducing buldges will feel like mountains, altenitavly any fast fit centre can whip the wheels off and spin them up on a ballencer to see if they are nice and round Quote Link to post Share on other sites
marvmul Posted December 14, 2006 Report Share Posted December 14, 2006 Maybe the flanges of the new hubs? Quote Link to post Share on other sites
Peter Vernon Posted December 15, 2006 Report Share Posted December 15, 2006 Just in case, have you checked the nuts are tight including the diff. May be a stupidthing to say but we have all done it! Quote Link to post Share on other sites
robgeev Posted December 15, 2006 Report Share Posted December 15, 2006 Sounds like UJ problems to me. Rob. Quote Link to post Share on other sites
RobIsaacson Posted December 15, 2006 Author Report Share Posted December 15, 2006 Thanks guys I forgot to mention the speeds involved... Vibration starts at about 50mph, reduces around 60mph and is undriveable at 70mph - didn't go above that as it's illegal Will get it on the ramps at the w/e but all suggestions gratefully received (even if they do state the blindingly obvious) I'm not ruling anything out at the moment. I'm going more towards UJ's at the moment but I don't know why. Regards Rob Quote Link to post Share on other sites
Guest caine62 Posted December 15, 2006 Report Share Posted December 15, 2006 I had a similar problem, turned out to be a perished UJ. Vibrations started at c.40mph, but then again my speedo is broken! Eli Quote Link to post Share on other sites
davehop Posted December 15, 2006 Report Share Posted December 15, 2006 Hi Rob Sounds like a UJ thing. It could be to do with lowering the car as this changes the angle that the ujs are used to operating at. There have been a few threads relating to uj vibration when cars are loaded up for touring - worth an archive search. Dave Quote Link to post Share on other sites
Tom Fremont Posted December 15, 2006 Report Share Posted December 15, 2006 Rob, Also make sure your UJs are in phase; i.e. the yokes and crosses should align. Theoretically these could be re-assembled incorrectly at the slip joints. You can also check the wheels for runout using a pointer touching the vertical face of the rim while turning. Should be very little gap variation on this test. I once found this condition to be caused by a bent hub, which elastically distorted the alloy wheel and gave visible runout. Quote Link to post Share on other sites
foster461 Posted December 15, 2006 Report Share Posted December 15, 2006 When I refurbed my rear end this summer I painted the hubs with POR15. The thickness of the paint on the inner edge of the hub center hole was enough to stop the hub from sitting square on the axle and there was a lot of vibration and visible runout when I examined the hub with the wheel removed. So I would also check that the rear hubs are on square and attached firmly. Stan Quote Link to post Share on other sites
RobIsaacson Posted December 29, 2006 Author Report Share Posted December 29, 2006 Thanks Guys, have now had a look underneath and unless there is supposed to be more play in a UJ than I've had in my underwear this year - it is looking very much like it's the UJ at the back of the prop shaft. Need to remove the gearbox to replace the clutch so shouldn't be too hard to sort while i'm there. Thought I'd make a note for anyone else who may encounter a similar problem in the future. Best Wishes to all in 2007. Rob Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.