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  #1  
Old 12-25-2009, 03:10 AM
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Join Date: Dec 2009
Location: Sydney Australia
Posts: 29
1989 300TE m103 engin whirr

Hi guys, i just picked this car up and it is my first Benz-i love it. I have noticed a bit of a whirring sound when the engine runs. Is this normal for one of these pups? Perhaps a normal sound due to a timing chain not a belt etc? If this is not normal then what could this be? Any pointers would be greatly appreciated. Motor runs great.
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  #2  
Old 12-25-2009, 04:10 AM
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Join Date: Jan 2008
Location: Melbourne Australia
Posts: 832
There is a vacuum leak somewhere behind the heater controls.
Ned, If you in Australia, here's some info for you.

(a) Go to http://ww.ozbenz.net/ and ask your questions there. Oz specced cars are slightly different from Euro and U.S. models.

(b) Watch out in Glenrowan
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  #3  
Old 12-25-2009, 06:02 AM
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Join Date: Dec 2009
Location: Sydney Australia
Posts: 29
Bewdy mate, thanks for that. This is the MB Aust guys isn't it? I got some gear from them the other day, great bunch of guys. I registered on the site but my activating email hasn't come through yet, perhaps a christmas shut down thing?
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  #4  
Old 12-26-2009, 10:35 AM
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Join Date: Jul 2001
Posts: 896
I would guess that the whirr is from the idler pully on the belt tensioner. I had a similar situation on an '88 300E. New pully fixed it.

Rgds,
Chris W.
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  #5  
Old 12-27-2009, 03:36 PM
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Join Date: Dec 2009
Location: Sydney Australia
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Thanks for that, i'll check it out when it stops raining. It's a pretty loud whirr and i am now starting to think it may be the PS pump. Are these a difficult/costly thing to replace? My engine is an M103 and the pump has that silver cylinder resevoir if that helps identify it.
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  #6  
Old 12-28-2009, 12:37 AM
mak mak is offline
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Join Date: Jul 2006
Location: Westfeld .
Posts: 687
AS mentioned above Most likely its the belt tensioner pulley on a failing tensioner .As the rubber in the tensioner collapses the pulley runs askew and the bearings fail . yes its quite loud and ominous sounding.suggest replacing the belt as well due to one side wear it causes
mak
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  #7  
Old 01-03-2010, 03:21 AM
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Join Date: Dec 2009
Location: Sydney Australia
Posts: 29
Hmmmm, i had a look at this wheel and it seems to run straight. The sound is quite a definate whrrr that reacts to engine speed. Man I hope it isnlt anything expensive!!!???
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  #8  
Old 01-03-2010, 08:12 AM
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Join Date: Dec 1999
Location: Utrecht, the Netherlands
Posts: 363
The easiest way to find the source of the noise is to use a car stethoscope.
They are very cheap, just a few $.

Do not use screwdrivers or sticks, if you hold them to your ear you can’t see if they touch a moving part!

Be very careful, don not touch anything moving!!
And of course do not wear any loose clothing, scarf’s etc!!!!!!!

Rob
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