In this video, I show you how to replace the alternator pulley, on a Mercedes. The car in the video is a Mercedes CLK (W209 2002-2009), but the process is the same for all Mercedes vehicles that have an OM646 diesel engine (200/220 CDI). This includes the C Class (W203), E-Class (W211), CLC Class (W203), and any car that has a clutched/overrunning alternator pulley. The alternator pulley can fail, causing the tensioner to bounce around due to increased resistance.

Tools used:
- 17mm 12 point deep/swan neck spanner
- 1/2 inch drive breaker bar or 1/2 inch drive ratchet
- Blue Print ADG05506 Freewheel pulley tool - this is an M10 spline bit, with a 33 tooth bit around the outside. You can purchase the 33 tooth bit separately and use an M10 spline bit that you already own.
- 17mm spanner to hold the alternator tool
- Small pick or flat head screwdriver, to remove the cap from the alternator pulley
- 1/2 inch drive torque wrench
- Laser Tools 7017 Wrench Extender, to attach a torque wrench/ratchet onto a spanner
- Philips/cross head screwdriver

Note: In the video, I should have reduced the setting on the torque wrench, as the wrench extender moves the head of the torque wrench away from the pivot point - meaning the applied torque was higher than indicated. If I re-did it, I would reduce the setting to around 75-80Nm.

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