[W126 Coupe] "Whirring" noise in the engine

[Jonathan Hodgman]

I've seen the SLS pumps make a noise that's hard to locate..


On 2/1/2011 9:22 AM, Michael Ramay wrote:

> It's not turning and it's unplugged.

>

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

> <mailto: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 <mailto: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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