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Old 10-15-2012, 01:05 PM
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Hydraulic vs. Mechanical Tensioner

How do I know if I have a merchanical or hydraulic belt tensioner on my X5?
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Old 10-16-2012, 05:24 PM
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I just replaced both tensioners and the idler pulley on mine.

Check out realoem.com, bavauto.com, ecstuning.com, your Bentley manual, etc., to learn the difference between the two types. Bavauto has a nice video of this replacement work.

Look in your drive belt area to see which you have. I might suggest using a flashlight at night and a mirror as needed.

I replaced my hydraulic accessory belt tensioner with a mechanical one. Purrs like a kitten!

Have fun.
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