|
We need to know more about the material. Was it heat treated, and if so, was it a through-hardening steel or was it only surface hardened? It has discoloration of a pretty uniform depth around the diameter, which appears to follow the contour of the keyway as well, indicating it may only be surface hardened.
The keyway itself does not appear to be an issue. The bottom corners are well radiused for the size of the keyway. I only see one little crack propagating from the keyway, from the left side, and it appears as though it way have been a result, not the cause, of the failure.
__________________
Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
|