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Auxiliary belt tensioner

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Old Sep 16th, 2018, 00:11   #1
calama
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Default Auxiliary belt tensioner

Just wondering if someone has had the same issue...just changed the aux belt and tensioner and all fine but the new tensioner seems to have a noticable vibration back and forth on the spring mechanism - is this normal? All other pulleys running true so seems odd that this should be happening umless the roller is sticking but seemed ok when i put in on although wasn't spinning completely free. Any advice gratefully received. Xc90 2008, 84k miles.

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Old Sep 16th, 2018, 00:47   #2
cheshired5
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A failing clutch mechanism in the alternator pulley can cause vibration in the auxiliary tensioner so check that first.
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Old Sep 16th, 2018, 00:48   #3
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Probably ok, usual cause is alternator pulley, however mine (v70 D5 163 e3) still hops intermittently after replacing alternator pulley...
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Old Sep 16th, 2018, 08:46   #4
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A failing clutch mechanism in the alternator pulley can cause vibration in the auxiliary tensioner so check that first.
Thanks - yes I did check the alternater clutch and seemed to be working ok and turning very smoothly.
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Old Sep 16th, 2018, 08:49   #5
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Thanks - yes I did check the alternater clutch and seemed to be working ok and turning very smoothly.
The pulley should slip when you flick the pulley in the reverse direction , and drive the alternator when you flick it the other way .. try it with the belt off .
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Old Sep 16th, 2018, 09:53   #6
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The pulley should slip when you flick the pulley in the reverse direction , and drive the alternator when you flick it the other way .. try it with the belt off .
Ok thanks will try check again, or could be the power steering pump? I didn't look at that.
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Old Sep 16th, 2018, 09:56   #7
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Ok thanks will try check again, or could be the power steering pump? I didn't look at that.
Highly unlikely to be the PS pump ..
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auxillary belt, pulley, tensioner


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