What was found
ON DISASSEMBLY FOR ITS 1ST OVERHAUL, DAMAGE FOUND ON 2 OF THRU STUDS. DAMAGE APPEARS TO BE DISPLACED STEEL UNDER THREADED PORTION ON SHOULDER OF THRU STUDS. ON 1 THRU STUD. DAMAGE IS SEVERE WITH DISPLACED METAL FROM SMALLER NECKED DOWN PORTION OF STUD UP TO THE THICKER PORTION OF STUD UNDER THREADS. OTHER STUD IS LESS SEVERE BUT HAS DAMAGE IN SAME AREA. LT CRANKCASE OF ENGINE ALSO HAS DAMAGE TO INSIDE OF THRU STUD BORE LOCATIONS. A 2ND FIRST RUN ENG WAS DISCOVERED TO HAVE SIMILAR DAMAGE TO 1 THRU STUD BORE LOCATION & 2 OF THRU STUDS. PREVIOUSLY A REPORT HAD BEEN SUBMITTED IN DECEMBER ON A THIRD ENGINE FOR THE SAME LT CRANCASE DAMAGE TO ALL 4 OF THRU STUD BORES. UPON CLOSER INSPECTION OF THIS 3RD ENG, HAVE FOUND SOME MINOR DAMAGE TO 1 OF THRU STUDS IN SAME LOCATION.