pulley failure
At Corowa Military Veh Rally approx 5 years ago, I had the shaft of the generator spin within the cast pulley chewing it our. The blades and pulley had a bit of a wobble, but the nut held it on. I think the blades started to touch the main lead to the diver helmet distributor (I have the Macs Auto modification so the coil is remote). What alerted me to the failure was the noise it made.
I think what may have caused this was multiple rebuilds over its life span and a hard shaft in a soft cast pulley.
Regards
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