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Belt Tensioner or Idler Pulley

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Old 03-13-2019, 10:33 AM
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2011 S550 4Matic
Belt Tensioner or Idler Pulley

I'm getting a bit of a squealing noise from the belt drive area. I've got just under 60k miles on it, bearings might be starting to go out.
Do I need a puller tool to get the Idler Pulley off?
Do I need to remove any accessories to get either of these replaced?
Any tips would be great, Thanks
Old 03-13-2019, 11:03 AM
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2010 CL550
Originally Posted by supralance
I'm getting a bit of a squealing noise from the belt drive area. I've got just under 60k miles on it, bearings might be starting to go out.
Do I need a puller tool to get the Idler Pulley off?
Do I need to remove any accessories to get either of these replaced?
Any tips would be great, Thanks
17mm socket and a pin(Allen wrench would work fine) to remove the tension from the belt, the tensioner is spring activated. Then it’s just a T10 or 12 socket I believe for either pulley..replace sooner rather than later as mine exploded and almost ruined my water pump
Old 03-13-2019, 11:43 AM
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'15 S550, '10 E350 P1/P2, '02 ML320
And no you don't need a puller to remove the idler pulley (assuming you mean the pulley(s) not on the tensioner.) They both have a central bolt with a Torx head on it.
Old 03-27-2019, 02:25 PM
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I replaced the tensioner & two idler pulleys today. Easy job, less than an hour start to finish.

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