911SC Fan Grind Marks

[Jaymanbikes12]

I recently acquired a 911SC, i wanted to clean up the tired looking fan and shroud. This pic is after vapor honing. As you can see it appears someone used a grinder on the hub of the fan for some reason, any ideas as to why they may have done this?

[mepstein]

More likely the fan was loose or improperly adjusted and was damaged during use.

[E Sully]

The grind slots to create the flats sides are normal on early fans from the factory, as seen on these fans. As mepstein suggests, yours seems to have a little welding done to fix some kind of issue. You could probably have it fixed up a bit with some careful grinding. It would most likely need to be balanced.

[porschedude996]

The steel hub can be replaced. I think they are $150.