Rod knock

[bmwmike]

Hope nobody minds sharing a link but this video is great at explaining rod knock and also a technique to diagnose the affected cylinder which I'd not seen before.

https://youtu.be/pYleKxjl0uY

[stevieturbo]

All valid, although usually by time you can feel the movement it's well fked anyway and doesnt really matter so much as it has to come apart.