Alex2.7T

hi, I been experiencing a weird noise underneath my car in direction of the center console. It can be heard when car is in on drive shift and at idle and a little when beggining acceleration. It is very noticeable when inside the car. When shifting to Reverse or Neutral the noise is significantly reduced and can barely be heard if you really pay attention to it. It just started doing it two weeks ago. At first I thought it could be a loose component from inside the center console. Any ideas what can be the cause? Does that sounds as driveshaft vibration?
heres is a link to video with sound.
https://youtu.be/qv69IOXHU74

clancy

Is this the center carrier bearing or driveshaft bearing that I have read about here a few times? Worth a search.

georgeb944

If the car only makes the sound while it is moving forwards or backwards, then it is most likely the front CV joint in the driveshaft or the bearing in the center.

It's a shame you have to remove the exhaust system and the heat shields to access the driveshaft.

Alex2.7T

thanks Clancy and George, the noise appears to be because the bolts on my driveshaft center carrier bearing being loosened up. I don't think I tightened these bolts enough when I replaced the flange seal. What is the torque specs for these bolts? And what can be done to avoid them from loosening in the future. Do you guys think I might have had caused any damage to driveshaft while driving car and having these two bolts being loosened? here are pictures of how my loosened bolts were looking

georgeb944

I have attached the procedure for adjusting the driveshaft from the service manual. The tightening torque is 25 Nm. I reinstalled mine without any locktite, but, if you feel that you need it, go ahead and use it.

Alex2.7T

Cool thanks man, I dont have that special tool to adjust the driveshaft, so I guess I will only eyeball it to its previous marks where the the bolt and adjustmen shim were sitting.