smokinv8 Posted September 17, 2013 Share Posted September 17, 2013 Have just fitted a new (BM)rear prop to my 90 and I now appear to have a vibration when the accelerator is applied, but it disappears when coasting. Prior to fitting this new prop I have been around each wheel doing/checking wheel bearings brake pads/discs etc, so no known issues there, and it drove fine on the old prop. The only reason I replaced the prop is because the UJ cup had been spinning in the yoke and I had ran it long enough like that to not risk it anymore. Before I take this prop off and either refit another, what else should I check? I'm going to start off with making sure the transfer box end (where it sits on the x-brake) is clean and no debri is in the way of the mounting and check gearbox/engine mounts. I know the front prop is good as well so no issues there. I'm kind of stumped and can only think that there must be an issue with the prop being out of balance, and I need to get this sorted quickly as I am at 7 sisters with Shires this weekend. Any other pointers fellas? Quote Link to comment Share on other sites More sharing options...
daveturnbull Posted September 17, 2013 Share Posted September 17, 2013 Only other thing I can think to try is the alignment. Some props work better with the UJ's aligned, some not. Take the short end off and turn in 45 degrees, or a couple of splines and give it a try. I do however feel you shouldn't have to do this with a brand new prop, only really when making up something from the pile of propshaft bits in the corner of the garage, so I'd be sending it back. Quote Link to comment Share on other sites More sharing options...
landroversforever Posted September 17, 2013 Share Posted September 17, 2013 Any play in the rear diff pinion bearings? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted September 17, 2013 Share Posted September 17, 2013 need to get this sorted quickly as I am at 7 sisters with Shires this weekend. Good man! See you there! Look at prop phasing, that can be wrong and seems to vary front or rear and with different vehicles, I've no idea where to find the correct answer, part numbers forum might know! Another possibility is that the old one had a stiff sliding joint and the new one doesn't, and is allowing something else to wobble that the old one forced to stay still. It could also be out of balance. Quote Link to comment Share on other sites More sharing options...
dailysleaze Posted September 17, 2013 Share Posted September 17, 2013 I had a rear prop with a seized UJ which wore the pinion bearings. I only noticed when I took the prop off and felt it, and the diff only started making a noise when I put a new prop on. The new prop may be unearthing a new symptom? As above AKA Tbox or diff Quote Link to comment Share on other sites More sharing options...
smokinv8 Posted September 17, 2013 Author Share Posted September 17, 2013 Any play in the rear diff pinion bearings? Some play in the diff but not a huge amount out of tolerance. Quote Link to comment Share on other sites More sharing options...
smokinv8 Posted September 17, 2013 Author Share Posted September 17, 2013 Have just picked up another new prop that I will fit tonight and see if there is a difference. Might end up coming down the M4 with just one prop on at this rate, and fitting the second one on site at 7 sisters then removing for homeward journey! Quote Link to comment Share on other sites More sharing options...
steve b Posted September 17, 2013 Share Posted September 17, 2013 I fitted a new prop for someone earlier this year , which they had bought mailorder , which had a tight uj before fitting . This vibrated first time up the road , so I popped the tight uj out to find the end of one of the cups had broken away. When I tried to fit a new HS uj it turned out the yoke was misaligned on one side on the prop itself. All I can think is the prop was dropped after machining and before assembly . It was returned and after much emailing was replaced. Faulty new stuff does happen .. cheers Steveb Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted September 17, 2013 Share Posted September 17, 2013 Have just picked up another new prop that I will fit tonight and see if there is a difference. Might end up coming down the M4 with just one prop on at this rate, and fitting the second one on site at 7 sisters then removing for homeward journey! Wouldn't be the first to do that! Tap me up if you're on site in need of a propshaft tool. Quote Link to comment Share on other sites More sharing options...
smokinv8 Posted September 17, 2013 Author Share Posted September 17, 2013 Wouldn't be the first to do that! Tap me up if you're on site in need of a propshaft tool. Thanks for the offer Fridge, but I always carry one! Fitted the other new prop tonight and took it out for a test drive and was a totally different beast. No vibration whatsoever, so must of been the prop at fault. 7 sisters here we come!! Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted September 18, 2013 Share Posted September 18, 2013 That's a good result but a bit disappointing for the BM prop. Quote Link to comment Share on other sites More sharing options...
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