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Cast iron pulley or Ali ?

Posted: Mon Oct 20, 2014 10:46 am
by rusty nuts
When i fit one of those Ali crankshaft pulleys after a time the slot open's up and then the wheel has movement. Question is this, do i have to use a Ali pulley, the car does have a Ali head on it. It did have a cast iron one on at first and even that slot had opened and a crack appeared.

I'm thinking a cast iron pulley would take a bit more before coming loose, i often wondered whether the alternator was a tiny bit out causing the slot to open.