Auxiliary belt tensioner - 2001 Scenic 1.9dci - Page 2 - Renault Forums :: Independent Renault forum

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post #6 of 15 (permalink) Old 23rd November 2009
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Perhaps a pulley is not perfectly round or its grooves are filled with dirt or something. That would explain why tensioner pulley keeps vibrating. A mechanics Stethoscope would come handy if the problem is bearing noise, but based on your description my guess is one of the pulleys is no longer round.
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post #7 of 15 (permalink) Old 23rd November 2009
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Cool aux belt pulley noise

Check your alternator pulley im on my second
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post #8 of 15 (permalink) Old 23rd November 2009
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Quote:
Originally Posted by dav214 View Post
Check your alternator pulley im on my second
That alternator pulley is not cheap. It was fubared on my Kangoo. Went to Renault to buy a new pulley but left empty handed. Cost was 70 pounds for a small plastic pulley! Took the existing pulley off and turned it true on my lathe.
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post #9 of 15 (permalink) Old 23rd November 2009
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I strongly suspect that the pulley on this posters car has a clutch inside of it which has seized,this causes the belt tensioner to jump around on idle making a nasty vibration noise.To test,remove the belt and grab the alternator pulley,spin it with your hand clockwise and then abruptly hold it to stop it.You should feel the alternator internals run on for a fraction of a second with the pulley held still.If it doesn't then the pulley is fubar'd and it needs replacing asap as they can fail and cause allsorts of expensive damage,especially if the aux belt gets wrapped around the crank pulley and goes into the cambelt.
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post #10 of 15 (permalink) Old 24th November 2009
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Originally Posted by Lagdti View Post
I strongly suspect that the pulley on this posters car has a clutch inside of it which has seized,this causes the belt tensioner to jump around on idle making a nasty vibration noise.To test,remove the belt and grab the alternator pulley,spin it with your hand clockwise and then abruptly hold it to stop it.You should feel the alternator internals run on for a fraction of a second with the pulley held still.If it doesn't then the pulley is fubar'd and it needs replacing asap as they can fail and cause allsorts of expensive damage,especially if the aux belt gets wrapped around the crank pulley and goes into the cambelt.
I assume that Lagdti is refering to some kind of freewheel or decoupling pulley. Renewing that with a standard solid pulley is going to be more reliable.
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