[W126 Coupe] "Whirring" noise in the engine

[mavris2]

My sel does the same thing. Smog pump.  Warms up and the garbage disposal noises stop.  Ha.   How the economy guage on the dash when its running at idle? Is it hard left. 

Jason

-----Original Message-----
From: Olsson_Chris <Olsson at lumber.com>
Sent: Tuesday, February 01, 2011 9:21 AM
To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
Subject: Re: [W126 Coupe] "Whirring" noise in the engine

You may be tearing up your car and missing the problem, Does the whirring noise go away after it warms up? If so, then most likely is your Smog pump, fairly common in older Mercedes. Mine is an 84’ 500 sec. Does not harm the car necessarily, but sounds awful, for the first 60-90 seconds. Mine has been this way for 2 years, as it costs a good amount of $$$ to replace. I had a mechanic check mine out, and he told me as long as the bearings were OK, which was the case with mine, that it was fine to continue the way it was. I plan to fix, but have had it like this for some time
 
From: Michael Ramay [mailto:mike.ramay at gmail.com] 
Sent: Tuesday, February 01, 2011 6:00 AM
To: Mbcoupes
Subject: [W126 Coupe] "Whirring" noise in the engine
 
My '87 560SEL makes a "whirring" noise when it's first started. Sounds almost like a bad bearing in the alternator and loud enough that my wife is commenting on it but in a mile or so it goes away.

- I removed all the V-belts on the front of the motor, still have the noise