As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE NR 1 CYLINDER STUD BACKED OUT OF THE ROCKER BOX ASSY, ALLOWING OIL TO EXIT ONTO EXHAUST. THE OIL LIT ON FIRE AND ACTIVATED THE FIRE WARNING. TAKEOFF WAS ABORTED BELOW 50 KNOTS. THE ENGINE WAS NEWLY O/H, WITH 59.3 HOURS. DURING BUILD UP, THE .3750 STUDS THAT EXTEND INTO THE ROCKER BOX ON ALL 18 CYLINDERS WERE SECURED BY WASHER AND LOCKNUT. IN THIS CASE THE STUD, WASHER AND NUT BACKED OUT IN ONE PIECE AND WAS RECOVERED.