[W126 Coupe] "Whirring" noise in the engine

[Olsson_Chris]

I would bet money that it is your smog pump, sounds exactly like what I
had going on. 

 

From: Michael Ramay [mailto:mike.ramay at gmail.com] 
Sent: Tuesday, February 01, 2011 6:23 AM
To: Markus Meyer
Cc: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] "Whirring" noise in the engine

 

It's not turning and it's unplugged. 

On Tue, Feb 1, 2011 at 6:15 AM, Markus Meyer <markusfmeyer at gmail.com>
wrote:

Is your air  pump unplugged?  That's what mine sounded like till I
unplugged it.

 

Markus

On Tue, Feb 1, 2011 at 9:00 AM, Michael Ramay <mike.ramay at gmail.com>
wrote:

	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.
	- Since it sounds like it's coming from the passenger side of
the engine up high, I removed that valve cover then ran the engine - it
was louder.
	- Put in a new timing chain and new guides. !@#$%^&* - still
have the noise but the car has noticeably more power.
	
	It REALLY needed the guides since one was broken in two and a 3"
long piece is missing plus another had the hole for the retention pin
wallowed out.  I looked very carefully down the chain pathway during the
installations but no sign of the piece.
	
	Will removal of the oil pan allow me to see much of the lower
timing chain guide area? If the missing chain guide is jammed in there
and rubbing on the rotating bits, why would the noise diminish in a
minute or so of operation?
	
	Suggestions?? 
	
	Thanks,
	Mike

 

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