They did, its called bolt stretch and the bolt stretch (preload) is what is driving the timing set.

 

fixed that...the timing gear is keyed...

my post was sarcasm...no way id do that...i guess it would work but its not for me...may as well beat the balancer on and weld iot to the crank

 

Actually, my post was correct. If you speak with Cloyes (OEM manufacturer) the key is not there to drive the crank sprocket, it is there for alignment and that is how they get away with a 1/4" thick crank sprocket on their Hex-Adjust system. It is the crank bolt driving it into the crank that is providing the driving for for the timing set. I asked this question specifically to them when I ran the numbers on shearing of the key with the aftermarket timing set crank sprocket.

 

so it doesnt play any role in driving the accesories......

 

Yes, those as well. I just wanted to point out this is a critical piece and needs to be installed correctly.

 

interesting theory that makes a lot of sense. Under those high loads, shearing a key will be quite common with those sprocket thicknesses if it wasn't for the friction created between the crank and the hub.

 

So did the OP ever get his **** fixed?

I drilled through the broken bolt in the back of the crank, I cant get an extractor to stick in it though.

 

How large did you drill it...is there still material left? See if you can find a left handed drill bit thats larger than the hole you already drilled...sometimes with a broken bolt I have good luck with a left handed drill bit starting to drill...then binding up and bringing the bolt out.