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Discussion Starter #1
Hello

This may or may not be a regular problem for 520d owners, I'm not sure.

Has anybody else had this annoying problem? If you have, how was it resolved.


The annoying thrumming only happens on tickover and goes as soon as you touch the throttle, no other known issues on the car, no warnings, nothing.

Any help would be appreciated as I called my local dealer ref the service bulletin 18/2/2008 and they knew nothing about it and had never stocked the parts before.
 

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Thrumming or ticking? front or back? there is a known issue with early N47 engine with the timing chain, BMW used to replace the engines but now rebuild
 

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Discussion Starter #3
Just a thrumming. On start you don't get it( CSD = higher tickover), only when it's warm.




"Service Bulletin 18 02 08

Customer may complain of a slight vibration and/or droning noise when the vehicle is idling in park, neutral, drive and reverse when engine is at operating temperature.


CAUSE
Insufficient vibration dampening of the exhaust system.


PROCEDURE
1.Verify the complaint. Vibration/droning is most prevalent when engine is at operating temperature.

2.Remove the lower bracket for the exhaust system. If droning/vibration is gone, proceed to step three. If vibration/droning still exists with the lower bracket removed; continue troubleshooting exhaust/driveline for other causes or conditions

3.Remove complete bracket assembly and replace it with the bracket (1) PN 18 20 7 521 346 using two new ASA bolts (PN 07 12 9 905 417. Tighten to 21Nm.
Install front pipe bracket (1) PN 18 20 7 521 347 with four rubber bushings (2) (PN 18 20 7 546 579) to the new 346 bracket with two ASA bolts (PN 07 12 9 904 559) and two nuts (PN 07 12 9 904 580). Tighten down to 21Nm
 
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