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Originally Posted by Duke2.6
The problem is that using a torsionally strained rubber bushing to maintain belt tension is just a piss-poor design architecture, and I'm utterly dumbfounded that Mercedes used a rubber bushing instead of a mechanical spring tensioner, which, if properly designed, should last virtually forever.
Duke
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Duke,
You summed it up beautifully! How they get a few things like this so wrong on what are otherwise well designed cars amazes me. I have learned to replace these tensioners as a matter of course whenever I have removed them for other work (eg. water pump replacement). Even the simple action of removing and replacing the belt can be enough to cause an ageing tensioner to fail. Whilst they are not cheap to buy, it saves a lot of hassles in the long run to simply replace them when you are already working in that area.
Greg
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