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Old 04-22-2004, 01:10 PM
Ray Galetti
Posts: n/a
Angry Another belt tensioner question 1998 E320 gas engine

The belt tensioner on my E320 is making a loud clacking sound while at idle speed, you can see the tensioner oscillating. As soon as you increase the rpm, the noise goes away and the oscillating stops. Do you all think I may need to replace the tensioner??
Thanks for the information, great site, and great people.
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Old 06-06-2011, 04:39 PM
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Join Date: Jun 2011
Posts: 1
Did you ever figure out what this was? I've got the exact same problem and am wondering the same thing.
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Old 06-06-2011, 05:08 PM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
It could be the tensioner or just the pulley on the tensioner (the idler pulley if you want to call it that).
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Old 06-07-2011, 08:49 PM
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Join Date: Oct 2004
Posts: 3,008
Replace the tensioner, it is a crap design and the new part will be an updated version.
90 300TE 4-Matic

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T04B cover .60 AR
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A2W I/C, 40 LB/HR
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Underdrive Alt. and P/S Pulleys,
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3.07 diffs, 1st Gear Start

91 300CE parting

90 300CE 104.980
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