Re: A6 quattro vibration at 60MPH after replacing L axle & rear diff seal
Posted: Sep 13, 2006 8:09 PM
Reply
Port fellamy,
Thanks for the coments, I did take the car back, he put up on the lift spun all wheels and said the vibration was from one ot he tires. I had 4 new tires installed today and balanced, 500.00 later the vibration is still there. Called him and made an appointment for Saturday.
I think you are right, it is the drive shaft flange, we'll see.
Thanks
Re: A6 quattro vibration at 60MPH after replacing L axle & rear diff seal
Posted: Sep 13, 2006 9:12 PM
Reply
I think I just found out what the problem could be from reading the bently manual.
When removing the yoke from the final drive the big nut distance to the flange needs to be measured with a depth gage. When reinstalling the nut it needs to be put back at the same distance. I know he didn't do that, in fact he torque the hell out of it with an impact gun. The noise and vibration I'm hearing must be the improper load on the pinion bearing. The question is how is this fixed now? This mechanic is a friend of mine and thought he was saving me money.
Re: A6 quattro vibration at 60MPH after replacing L axle & rear diff seal
Posted: Sep 14, 2006 12:24 AM
Reply
I think it's the driveshaft not being replaced the way it was originally. Reason I say this is because I have the same problem after doing mine. I was under the car, saw the rear was marked with yellow paint per the Bentley, and began removing the front end of the driveshaft (I didn't remove the entire piece, just the front).
When I was removing the front, I didn't mark its position thinking about the marks on the rear and assuming they would be on the front too. Since I was in such a rush I didn't even realize the front wasn't marked at all. Now I have the same exact vibration, except mine is a little sooner. Did the tire thing, road force balanced, etc., etc.
I think I have to have the driveshaft rebalanced, but don't know how I would go about having someone do it since I imagine it has to be done on the car with all 4 wheels moving to balance it as it rides.
Re: A6 quattro vibration at 60MPH after replacing L axle & rear diff seal Posted: Sep 10, 2006 11:26 PM
Reply
boknows20,
Thanks for info, what does balancing the axles actually involve. I did speak to my mechanic and he said that he marked the flange position prior to removing final drive shaft for the seal replacement. The only thing it could be is the front axle that he also replaced. I still have the old one with the ripped boot, I wonder if I should just repack and replace the boot and put it back in the car.
I'm going to see him again tomorrow and put the car on the lift with the wheel spinning maybe we can pinpoint it.
thanks for your help, I'll post results.
Re: A6 quattro vibration at 60MPH after replacing L axle & rear diff seal
Posted: Sep 11, 2006 1:28 PM
Reply
Front axles don't need balancing. They don't turn fast enough to cause a vibration.
There must be some other issue. I had my front axles replaced a couple of weeks ago and my car drives smoothly at any speed.
Re: A6 quattro vibration at 60MPH after replacing L axle & rear diff seal
Posted: Sep 11, 2006 1:40 PM
Reply
THX...
The did an alignment and balanced the tires. they also "broke" the Dynamic headlight sensor somehow.
Re: A6 quattro vibration at 60MPH after replacing L axle & rear diff seal
Posted: Sep 13, 2006 12:50 AM
Reply
I think if the noise continues that the mechanic may have not marked the shaft location properly, and is feeding you some excuses. It's a little tricky if he's not familiar and doesn't have the factory manual, he probably didn't do a good job with it. Even if you mark it, you have to be sure you marked it at the right locations when lining it up. Often times the drive flange rotates upon seal removal so putting a mark on just the outer drive cv joint won't help to verify location.
Re: A6 quattro vibration at 60MPH after replacing L axle & rear diff seal
Posted: Sep 13, 2006 8:09 PM
Reply
Port fellamy,
Thanks for the coments, I did take the car back, he put up on the lift spun all wheels and said the vibration was from one ot he tires. I had 4 new tires installed today and balanced, 500.00 later the vibration is still there. Called him and made an appointment for Saturday.
I think you are right, it is the drive shaft flange, we'll see.
Thanks
Re: A6 quattro vibration at 60MPH after replacing L axle & rear diff seal
Posted: Sep 13, 2006 9:12 PM
Reply
I think I just found out what the problem could be from reading the bently manual.
When removing the yoke from the final drive the big nut distance to the flange needs to be measured with a depth gage. When reinstalling the nut it needs to be put back at the same distance. I know he didn't do that, in fact he torque the hell out of it with an impact gun. The noise and vibration I'm hearing must be the improper load on the pinion bearing. The question is how is this fixed now? This mechanic is a friend of mine and thought he was saving me money.