15-02-2022, 02:43 PM
There's not really much point in over-complicating the fan pulley design by adding ball or needle rollers, the original design works fine, but if it floats your boat why not. What is important though is that the fan belt is not over-tensioned - that just puts strain on the pulley, its shaft and the bearing. The only thing driven by the belt is the fan, so it doesn't have to be bowstring tight. In fact quite loose (or even not there at all) seems to work fine in most circumstances.