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Thanks John. I should of searched on the site before asking the question about rust as clearly that is a problem in removing the fan. If I had designed it, the motor would have had a stainless steel shaft and the fan boss would have been made of brass. Of course, Grant would have not sold as...

Did not get too far with replacing the bearings. The fan boss was rusted to the shaft and just would not budge, even with a little heat. Did not want to risk damaging the fan, so all back together and thankfully still working. There was no oil on the oil pump shaft, so will just have to put up...

Many thanks for your replies. I have had problems with leaking oil seals before - Danfoss RSA - and there was a fair bit of oil on the plate below. Sounds like a strip down, so I will replace the bearings anyway and inspect the pump.

I expect you have solved the problem by now, but I am thinking that new bearings are required on my Riello motor after it suddenly started making a whining noise. I was hoping to attach a sound file (.m4a) but if it is possible, it does not appear to be straight forward. Anyone know how long the...