As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS SPINNER BULKHEAD WAS A NEW PART THAT HAD ONLY 57 HOURS WHEN IT CRACKED. THE CRACK WAS LOCATED IN THE FRONT PLATE UNDER THE SCREW HEADS THAT HOLD THE PLATES THAT MOUNT THE BULKHEAD TO THE CRANKSHAFT. THE SPINNER WAS INSTALLED WITH THE PROPER AMOUNT OF SHIMS IN THE FRONT BULKHEAD.