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Been there, done that... still have the broken key.
BTW, the car I had this happen to has had 40,000+ more miles put on it after my fix.

Liberty, (James (st louis sho) ) My dads car was just as bad. I have a keyway and gear if you need, but you'll need serious TQ to keep it all in line...

From what I can tell, your car could probably be repaired with a new woodruff key and a timing belt sprocket, right?
Is the crank normally damaged when this occurs?
Does anyone know why this tends to happen?
Is it possible to remove the key from another crank and transfer it over?
As far as I can tell, the keys are simply friction fit?
I'm probably going to start taking the SHO apart tomorrow to determine if this is the timing issue that I'm having with this car.
How was it running when you took it off the road?
I'm crossing my fingers that it's ok. The crank pulley fit very snugly over the key when I installed it. So much so, that I don't see how anything could have moved.
Thanks,
Ian

LJRuddy said:I am getting a new woodruf key and cam sprocket
For this to happen, the sprocket would have to be loose. It may have felt tight, but the clamping force needed wasn't there. I have a few spare keys laying around.
Did you you have any slight knocking or clicking sound when the car ran? Mine made that for a month or so and couldn't pin point where the sound was coming from, so then I took everything apart and found the broken key.
I think you mean crank sprocket, right?

Not sure why it happens. You would think it would be a loose pulley bolt but mine was on solid.
For this to happen, the sprocket would have to be loose. It may have felt tight, but the clamping force needed wasn't there.