That's the one, thank you. However mine is plastic, not sure if that makes a difference.

Hi all,

I've got our bongo in the garage at the moment to investigate an annoying whirring noise coming from the engine.

After much digging around it turns out to be the bearing in the aux belt pulley

Aux belt pulley bearing thing https://imgur.com/gallery/LvOdZHg

Now the plastic is 18 years ...