I replaced a failed viscous fan and the fan turned over easily and smoothly. However, because the fan clutch plate-to-water pump flange was too thick on the replacement part, the studs were too short to safely hold the nuts (previously reported). I removed the studs and replaced them with studs 1/2" longer. Now the fan does not spin freely, and upon engine start, does not turn at all, and there is a loud squeal and "hot" smell.
I've seen or heard of this before, but cannot remember the cause.
All help will be appreciated.