E-Class (W211) 2003-2009

serpentine belt

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Old 04-30-2018, 04:08 PM
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e320 cdi
serpentine belt

When should the tensioner on the serpentine belt be replaced?
Old 04-30-2018, 07:16 PM
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1999 E300TD
When the tensioner is faulty-----have you tried to decrease the tension and does the tensioner spring back to position when you reduce the force??----if it does---wada you think?
Old 05-02-2018, 08:29 AM
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W211 E320 CDI Sportpackage With Carlsson CD32 Chip 2004
Just spray it with some lubrication and it will ring forever.if these metal ballbearings will drie out then it dies.
Old 05-02-2018, 12:48 PM
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1922 Ford Model T / no OBD
What engine?
I think most tensioners those days are lifetime item (again) but idler pulleys bearings are still weak. You can inspect them easy with belt removed. If they don't spin smoothly- replace. Cheap enough and I think carry spare one in trunk would be good idea.

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