4104 fan dreaded fan hub failing

[luvrbus]

The rubber mounting was for the vibration and flexing of that heavy fan blade. How about a lightweight fiberglass fan of same capacity without the rubber setup.
The other option is to find an old look city bus and get the hydraulic fan setup off it. It will work on the 4104. We had one on ours.

That would work but I would get a more modern setup from a wrecked rv they are smaller with more power  ,I have replaced 2 engines on the 4104 because the end of the crankshaft broke off from the PTO coupling and the damper going bad