Irritating squeal

Discussion in 'Engine' started by SimonsMerc, Apr 27, 2005.

  1. SimonsMerc

    SimonsMerc MB Enthusiast

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    Hey folks,

    For a long time now, I've had a really irritating 'squealing stutter' sound when my car is at a standstil with the engine running at idle. This sound disappears if I touch the gas even lightly, or if I turn the steering wheel just slightly off its rest position in either direction. Odd, eh?

    The sound is similar to that which I once had on a mark 2 ford escort when the fan belt was slightly loose, so a few weeks ago I decided to take a look under the bonnet. I found some belts which were in the general area where the noise was coming from, please see the attached photo. And then, I sprayed them with a little WD40 (just for the hell of it, to see if that's where the sound is coming from), and...blissful silence, nothing but the purr of the straight six.

    Well, for about a week, anyway - then it started again. So I sprayed it again, and it vanished for another week, and came back, and this is the third time I've sprayed it to get rid of the irritating noise ;-)

    So, help. Anyone have any idea what could be going on? My theory was that a belt (I have no idea what all these belts are for!) could be slightly loose - is there some kind of a tensioner that might not be working? How do I check for this sort of thing? Or am I better off taking it to someone sensible? I enjoy playing with things like this but I'm not very skilled at it :)

    It's very odd how it goes away not only when you hit the gas, but also just by turning the steering wheel left or right - almost as if something's rubbing on something else somewhere and moving the steering wheel just a fraction moves it away.

    Appreciate any ideas!

    -simon
     
  2. nickmann

    nickmann Active Member

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    I suspect you want a new polybelt and quite possibly a new tensioner as well.
     
  3. Shude

    Shude Hardcore MB Enthusiast

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    Mine has done this for 2 years and I just put up with it. It's seen various mechanics and no-one has ever suggested it needed fixing or anything, which is odd seeing as the stealership pretty much know I will have anything done to the car if it's needed and it'd be easy money for them!
     
  4. OP
    OP
    SimonsMerc

    SimonsMerc MB Enthusiast

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    Cool, what's a polybelt and tensioner? I guess I'll be asking George Fraser at the next service :)

    Shude - you just put up with it? Doesn't it drive you nuts sitting in traffic? It's making me crazy!

    -simon
     
  5. blicky_1

    blicky_1 Active Member

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    Basicly a fan belt and an adjustable roller that the belt runs around.
     
  6. tomtom1967

    tomtom1967 New Member

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    is the belt running good a true or is it bouncing up and down at the top when
    engine running.
     
    Last edited: Apr 29, 2005
  7. Shude

    Shude Hardcore MB Enthusiast

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    Mine's a quiet, broken-squeal which is inaudible from the cabin, so I've not really noticed it. When I've got out of the car to open a gate or something with the engine still running after a decent drive I notice it.
     
  8. OP
    OP
    SimonsMerc

    SimonsMerc MB Enthusiast

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    It seems to me to be running just fine - but then I'm no mechanic! I'm beginning to think this one is beyond me, will mention it at the service and see what they say :)

    -simon
     
  9. Dieselman

    Dieselman Banned

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    Try cleaning the belt then using some "belt dressing".

    WD 40 isn't the right stuff to use.
     
  10. uumode

    uumode MB Enthusiast

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    I have this annoying high pitched 'whistle stroke ringing' noise not so much a 'squeal' or maybe it could be (difficult to describe).

    It only starts when the engine is well warmed up, perhaps 8 miles into a trip, and the high frequency is 'just' enough to penetrate the cabin when you have no fans/music on, otherwise I can't hear it, but I certainly hear it when I get out of the car to put it into the garage.
     
  11. BaldGuy

    BaldGuy MB Enthusiast

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    I have a similar squeal on my Jag.... funnily enough though its only when the wifes in the car..... :D
     

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