What is the diffrence between a hydraulic & a mechanical pulley?

Asked by Malimalcs Jan 17, 2016 at 05:03 PM about the 2003 BMW 3 Series 325xi Sedan AWD

Question type: Maintenance & Repair

I need to replace my upper idler pulley and lower tensioner I have a little squeaking going on after I start my car, and I was wondering how would I know if its a hydraulic or mechanical tensioner?

1 Answer

Malimalcs answered 8 years ago

Ok I had to twist it with a rachet wrench and socket is that a hydraulic or mechanical? I need to replace them there squeaking.

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