For ages, I have had a squeal on the Land Rover. I made the mistake of asking on the forums etc. Which is never a good idea as you always have people quoting the most expensive item to fix. I decided to let it develop so that I could finally be able to hear it easily and know that it was.
I had thought it was the Viscus Fan Pulley Bearing but as I stripped it down to get to that bearing I removed the serpentine belt and behold the two idler wheels were rather wobbly and one was crunchy. Look at the price of the parts, £45 without the postage, eek. https://www.lrworkshop.com/diagrams/land-rover-defender-engine/td5/drive-belt_53211
Hmm, they look like standard bearings, a quick call to Frome Bearings and Belts LTD and they have them in stock. Less than £20 and I had the bearings, admittedly it should be 6303LHA and I fitted 6303LLU but it will do. The only info I can find is HA is case hardened outers but not sure how that is going to make a difference.
I started to tap the bearings out but soon the shed dwelling parent turned up and using some random old sockets and a number 2 hammer managed to convince the old bearings to leave and move in the new ones. I refitted and now the Land Rover it quieter, for now. I may need to give the Land Rover a wash now.