What was found
REBARRELED CYL, ECI PISTONS. LOSS OF OIL PRESSURE, 260 STOH, 1043 SMOH. CAUSE, BROKEN NR 2 PISTON, PARTS BLOCKING OIL PICKUP SCREEN. POSSIBLE CAUSES. DEFECTIVE PISTON CASTING, DROPPED PISTON OR IMPROPERLY MACHINED NR 4 RING GROOVE, SQUARE CUT BOTTOM OF GROOVE. 50 PERCENT OF BOTTOM SKIRT BROKE OFF PISTON. PISTON RING BROKE INTO ABOUT 20 PIECES.