strange drumming noise?

ss

Registered User
:uhm:the car is 2010 audi a4 2.0 tdise technik.with with 40k on the clock
i noticed this strnage drumming noise coming from the engine while it is idling.
is this normal or is it some sort of pump ?
i tried locating the source of thse drumming with a stethoscope but could not hear it where it was coming from.
 

benjie

Registered User
I'm not familiar with this engine, but the older diesels had problems with the bearings in the alternator pulley.
 

ss

Registered User
did alternator bearings cause a drumming sound in the older diesel audis?

(i do know from personal experience that in the older vw 1.9tdis it caused a different sort of sound-(high pitched) when the bearing failed)
 

benjie

Registered User
When mine was on its way out, it was a low rumbling sound when driving and on idle it drummed a little bit, I expect that would have happened more if I didn't replace it as quickly as I did.
 

Stonefish

Registered User
Could be worth using a mobile phone to record the sound and post a short mp3 attachment. There are apps that can record sound or shoot a video and then use software like Microsoft's free Windows Movie Maker to extract the sound file. When my water pump bearing went I posted a sound file and I got some good feedback.
 
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