richardthestag Posted January 23, 2008 Share Posted January 23, 2008 Driving home last night in my 93 3.9 auto RR I noticed that it was growling and vibrating between 45 and 55mph, It was worse on overrun and was consistent with road speed rather than engine speed. The vibration was not harsh but could definately be felt through the foot rest and throttle pedal. After a quick check around I couldn't see anything obvious so drove home (about 20miles) The problem got a lot better as the car warmed up and by the time I had got off the m40 and onto the back roads it had all but gone. I did notice that at the end of my journey there was a noise like something touching a prop (but nothing was touching the props) that occured occationally but mainly on over run. I had a look underneath but couldn't see anything wrong it was cold and dark so I gave up. This morning the grumble is back and seems to be vibrating harder, it is no louder with the windows open but then there is sooo much road noise that it would have to be pretty loud to hear it. I took the car home and used the Stag for work today. Tonight I plan to check the viscous diff is working as it should, last night I jackup up the front end and was dissapointed to feel the slightest play in the top swivel pin (these were replaced last July) is this normal. Other than wheel bearings what else could be causing this? do I test front wheel bearing by driving on a full lock and listening for nasty noises? I am hoping that flex plate issues would be consistent with engine speed and would go away if gearbox is in neutral (or do I have to kick the transfer box into neutral?!) Ta for reading Richard Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 23, 2008 Share Posted January 23, 2008 Check wheel bearings by jacking the wheel up and spinning it (it shouldn't rumble) and rocking it top-to-bottom (it shouldn't have play). Quote Link to comment Share on other sites More sharing options...
Jon White Posted January 23, 2008 Share Posted January 23, 2008 Propshaft U/j? Jon Quote Link to comment Share on other sites More sharing options...
bishbosh Posted January 23, 2008 Share Posted January 23, 2008 Being worse on overrun would say propshaft to me too.... Quote Link to comment Share on other sites More sharing options...
Roverdrive Posted January 26, 2008 Share Posted January 26, 2008 Would also add my tuppance for propshaft U/J. You need to park on level ground and securely chock the vehicle, and then put in neuttral and handbrake off to locate any free play in the props. Quote Link to comment Share on other sites More sharing options...
clbarclay Posted January 26, 2008 Share Posted January 26, 2008 Might just be me, but from the time I first noteced the symtoms whilst greenlaing to checking in a car park there was enough wear in the UJ (front of transphere UJ is usually the one to go) that I could just grab the propshaft and shake it, its was that obvious. Quote Link to comment Share on other sites More sharing options...
richardthestag Posted January 27, 2008 Author Share Posted January 27, 2008 Many thanks chaps, it was indeed the propshafts. I had a second set in the garage which came of my last RR which I scrapped but that had recent UJ's fitted. The front prop had slight play in one UJ but more than enough to cause the vibration. The back prop had one uj semi seized i.e. it would swivel in one direction but was totally solid in the other. Problem fixed in one hour under the car Quote Link to comment Share on other sites More sharing options...
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