This is what happens when you dont use a hardened pulley
#1
This is what happens when you dont use a hardened pulley
Here is what happened with my ZPI pulley which is non-hardned. My car started leaking oil really badly. Turns out the light weight crank pulley got groves worn into it due to not being hardened. NST is the only company that Im aware of that makes the pulleys hardened. Here are the pictures.
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