stopping belts from squealing.
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  1. #1
    1000+ Posts jo proffi's Avatar
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    Default stopping belts from squealing.

    The multiV accessory belt on the r19 is squealing away and driving everyone nuts.

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    The car is new to me, (weeks) but I dont remember it having this problem when it first turned up. After the big wet, the noise developed.

    I carefully applied a bit of condensed lanolin onto the multi-V belt facet only which immediately helped but 20min later, the squeal returned with mates, extra loud and new harmonics.

    So I put the slightest vapour of lithium grease on which cured it for a day before the origional mildish noise came back.

    Then the flatmate, a mechanic sprayed a spray on it, which shut it up for a few more days untill a mild squeal returned.

    This is ruining an otherwise very nice car, and needs to be remedied.

    Is there a cure? A degrease and re application of a single product, or is a new belt in order??

    This type of failure is new to me as the lanolin has always worked permanently on the V belts of the older cars i'm accustomed to.


    Jo

  2. #2
    Fellow Frogger! Roland's Avatar
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    Default

    Had the same situation on a SRDT 405 recently
    Gave up on spray on stuff and fitted a new belt - problem solved!

  3. #3
    1000+ Posts Beano's Avatar
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    Squealing is due to two polished surfaces rubbing together. Putting in a new belt will work because you are re-tensioning it and making it a little tighter, plus it will not be polished on the inside like the old belt.

    As far as I know, the spray your mate used is sticky, so it will be incompatible with the lanolin.
    Degrease, dry, and re-apply sticky stuff. Also re-tension belt very slightly.
    And it really wouldn't hurt if you got some fine sandpaper (600-800 grit) and roughed up the pulleys in the direction of travel. In fact, I'd highly recommend this.

    To be extra sure, because the squealing is due to two polished surfaces rubbing together, you could even rough up inside of the belt slightly (wherever practicable) with the same grade sandpaper.
    Last edited by Beano; 30th July 2011 at 11:07 PM.

  4. #4
    Fellow Frogger!
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    Assuming the tension is correct there is the possibility that the belt is worn out!

    While the belt may look fine, if it has worn to the extent that the belt bottoms in the pulley grooves the tapered driving faces will not transmit the load they are designed for.

    Check for a polished appearance on the outer edges of the pulley grooves - if these faces are shiny the belt must be replaced.

    Overtightening to try to stop the slippage will overload the bearings on the components the belt drives - then big dollars to fix when they fail.

    Regards,

    fento

  5. #5
    UFO
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    Default

    I had a similar problem on the CX recently - it has belts that drive pulleys that drive more belts. I thought the AC belt (end of the line) was slipping and it was driving me nuts. Turned out it was the twin belts from the crankshaft pulley to the water pump were not tensioned enough and THEY were slipping under the load when the AC was turned on.
    Craig K
    2009 C5 HDi Exclusive

  6. #6
    1000+ Posts jo proffi's Avatar
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    Thanks for the reply's guys.
    Its good to know what's causing the noise.

    I'm left with the feeling a new belt would be a worthwhile investment, so wont waste any more effort on de squealing this one.


    Jo

  7. #7
    Fellow Frogger!
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    Default belt squeal

    The best way to stop the squeal ive found in the past is either a lube stick or a normal household candle. especially for fan belts etc, assuming you can reach them without doing yourself harm, is to hold the candle against the belt while the engine in running, a few mins on each side of the vee worked wonders of me in the past. but watch your fingers and arms depending on the space available.
    On a simular subject my wiper blades drag and squeal like mad any suggestions.

  8. #8
    1000+ Posts The Gonz's Avatar
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    Icon10 Wiper blades

    Rubber on glass: aim for cleanliness.

    Do all you can to get that glass as pristine as you can (polish it!) and use high quality rubber.

  9. #9
    1000+ Posts Beano's Avatar
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    I use Rain-X on my windscreen, and once I put in new wipers. I thought I'd buy silicone ones rather than rubber, but they squealed like crazy. Perhaps just buy a new pair that you KNOW are rubber.

  10. #10
    bob
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    Default Silicon blades

    G'day,

    in my experience silicon wiper blades are rubbish, go for rubber every time - metal backed and Valeo if you can find them.

    Silicon blades are noisy any tend to smear the water instead of wiping it off.

    Afterthought - install them with the clip on the inside of the arc, if the clip ever disappears, as they do, little buggers, just put a little bit of soft wire through a hole at that end to stop it sliding through. They only ever seem to come out at the outside of the arc when you loose them so you only have to stop them sliding that way.

    cheers,
    Bob

  11. #11
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    Default

    A very old trick to stop belts squealing was to use a smear of VEGEMITE on the offending belt.

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