(quoted from post at 06:01:42 09/09/22) ..... So my next question is what happened?
Did the pulley slip off far enough for the key to fall out?
No. Next to impossible. The key is shared by both the crankshaft pulley AND the crankshaft gear. It is "captured" by the gear. If the key was not in position, it is unlikely to run as the crank gear could rotate on the crankshaft causing a complete loss of crank / cam timing
Unlikely. If the pulley is not engaged with the key, it is more likely that the pulley bolt came loose and the pulley moved far enough out to become disengaged. Or possible I guess, that the key slot in the pulley broke.
In either of these scenarios the pulley would most likely not be turning as it could slip on the crankshaft.
My guess is that it is just loose
Did something become unbolted?
Certainly possible that the crankshaft pulley bolt came loose. Though with the pin drive hub engaged with the pulley, I don't think the bolt could come completely out
I really have no idea how the pulley is attached o the shaft and want to learn.
Doc, I stated in your previous message:
Loose Belt Pulley
[i:69b4f60523][b:69b4f60523]"All these pulleys bolt onto the end of the crankshaft with a "skinny head" bolt"[/b:69b4f60523][/i:69b4f60523]
The exception to this bolt is the "ratchet" style bolt used as OEM. (without any type of hydraulic pump hub)
Here's a couple pics showing the crankshaft key