belt/bearing chirp and squeal
Thread Starter
Member
Joined: Feb 2019
Posts: 96
Likes: 4
From: indiana
2008 s550
belt/bearing chirp and squeal
08 s550 had a belt squeal for first few minutes of driving I replaced the belt tensioner and it reduced to a chirp thats constant. The belt and idler pulleys were replaced 8 months ago can't seem to locate it.
Super Member
Joined: Jun 2003
Posts: 713
Likes: 147
From: Aridzona
'15 S550, '10 E350 P1/P2, '02 ML320
That squeal could be a bearing on one of the belt-driven components. You might try removing the belt and slowly rotating the Alternator, Water pump, etc. by hand. A mechanics stethoscope can help isolate the source of the noise.
Newbie
Joined: Apr 2007
Posts: 5
Likes: 4
From: Perth, Australia
W221 S350 2006 + Porsche 997.2
If you don't have a stethoscope try a short length of 13mm black poly retic pipe - works a treat; just be real careful not to get it caught up in the belt.
Speaking from experience another reason may be due to the belt and in particular the side of the belt rubbing against one of the pulleys - try rubbing a dry cake of soap on the side (again be very very careful) and see if it stops for a while. And in my case using a non genuine MB belt caused the problem - disappeared when I went genuine belt.
Speaking from experience another reason may be due to the belt and in particular the side of the belt rubbing against one of the pulleys - try rubbing a dry cake of soap on the side (again be very very careful) and see if it stops for a while. And in my case using a non genuine MB belt caused the problem - disappeared when I went genuine belt.
Thread Starter
Member
Joined: Feb 2019
Posts: 96
Likes: 4
From: indiana
2008 s550
If you don't have a stethoscope try a short length of 13mm black poly retic pipe - works a treat; just be real careful not to get it caught up in the belt.
Speaking from experience another reason may be due to the belt and in particular the side of the belt rubbing against one of the pulleys - try rubbing a dry cake of soap on the side (again be very very careful) and see if it stops for a while. And in my case using a non genuine MB belt caused the problem - disappeared when I went genuine belt.
Speaking from experience another reason may be due to the belt and in particular the side of the belt rubbing against one of the pulleys - try rubbing a dry cake of soap on the side (again be very very careful) and see if it stops for a while. And in my case using a non genuine MB belt caused the problem - disappeared when I went genuine belt.
Junior Member
Joined: Dec 2010
Posts: 47
Likes: 2
04' S600
As a note. I got the lube from that service bulletin and the noise goes away for the day but comes back in the morning like clockwork.
Last edited by bbbc78; Apr 21, 2021 at 12:38 AM. Reason: Wrong thread
