Vibration increase, particularly at idle…any ideas?

[360beast]

Originally Posted by AllHailKingVolvo

Thanks Dave, that’s an excellent plan-I’ll try it!

In the meantime, I found that the alternator tensioner clamp bolt was loose, so the alternator belt had lost quite a bit of tension and the alternator was rattling about whilst the engine was running-all tightened up and sorted now, and no more weird noises when pointing up/down hills!

Said bolt/nut has worked loose a couple of times now. I suspect some sort of resonant frequency is causing it to chatter itself loose. I’ll replace it with a nyloc nut at some point methinks to see if that solves the issue.

I've had this issue with one of my customers 940s, the alternator bolts worked loose a couple of times, in the end I threadlocked them in place and didn't have the issue again.