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Old 06-16-2003, 01:13 PM
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Tensioner failure E300TD

Has anybody experienced a sudden tensioner failure leaving the serpentine belt flopping around? The car is my '99 E300 TD and I wouldn't have known except for the 'battery charge' warning light which came on when the belt started flopping. Can this cause any damage by driving a few miles like that?
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Old 06-16-2003, 03:33 PM
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Join Date: Jul 2001
Location: SoCal
Posts: 1,303
It could, because the water pump won't circulate. Likely not, though. The belt tensioner will fail this way because the tension 'spring' is actually a molded-on rubber bushing that is twisted. When the rubber deteriorates, it breaks loose, and the assembly must be replaced. Don't drive until it is fixed.

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Old 06-16-2003, 05:19 PM
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Join Date: Sep 2001
Location: Wrightsville Beach NC
Posts: 1,512
make sure your mechanic replaces the entire unit as well as the adjuster....Good Luck ...we've all been there.

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Old 06-16-2003, 06:25 PM
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Do the shock while you're at it.
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