As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT AND INSTRUCTOR EXPERIENCED AND ENGINE FAILURE ON FINAL. UPON INVESTIGATION NR 2 CYLINDER STUDS BROKE OFF THE CYLINDER WHERE THE CYLINDER MOUNTS ON TO THE ENGINE CASE. THE PISTON SKIRT WAS FOUND BROKEN AND THE CYLINDER SEPARATED FROM THE ENGINE. THE CAUSE OF THE DAMAGE AT THIS POINT IS UNKNOWN.