Replacing pulley on Bosch alternator on Volvo D5 engine (V70 2008).

Alternator pulleys have a clutch system that allows it to rotate freely on the alternator drive shaft when spinning in the opposite direction to the normal operating direction, much like a bicycle freehub. The clutch mechanism fails eventually. Mine waited until 191,000 miles before giving up!
In the video I use a special pulley extractor tool with a heavy duty impact driver. It's not possible to do this repair with the alternator mounted to the engine on a Phase III V70 (57 plate onwards). Removing the alternator is a right pain. I needed to also replace the auxiliary drive belt.

[@FrogeyeUK]

Fantastic level of detail. Thanks for putting this guide together.

[@JnJShiffler]

What is the torque spect when installing? About to install mine.

[@clintans]

85nm

[@rsobral560]

So you used the impact to clockwise position

[@BG-il2ym]

Yes, I had my impact wrench on clockwise.

[@clintans]

Opposite on my alternator, S60 petrol. 🧐