[W126 Coupe] "Whirring" noise in the engine

[Markus Meyer]

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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