Timing gear fatigue failure

[Audiowner@aol.com]

Spent all today tearing into my 86 5KS NA KZ engine to replace the head
gasket.  This January thaw in NY is a real blessing.

When I took off the cam gear,  I ran into an interesting problem-

At the tip of the keyway on the gear, I have a nice crack which has propagated
about half the length of the key.  The cracked portion has started to peel
back along the crack plane.  I never suspected to run into anything like this
on an Audi engine.  

Part number is 049 109 111B- gear is stamped "England" .

Obviously I'll be replacing this.  I'm just curious if there are any BTDT's on
this one.

L8R

Jerry