I would like to add that getting the tensioner properly tensioned is one of the keys to its longevity: Too tight and the tension stresses the bearing and bearing assembly, too loose and the motion of the belt seems to tear the inner rubber section.

I would suggest following everyone's advice and become familiar with how the setup works.

Regarding the bearing in the idler wheel, make sure the plastic dust cover cap is in place. If missing it will allow dust, dirt and water in and it won't last long at all.....

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)