What was found
CYLINDER REMOVED DUE TO HEAD SEPARATION FROM THE CLYINDER BARREL. SUBMITTER NOTES THE CYLINDER WAS RE-MANUFACTURED IN JANUARY, 1994 (HEAD STAMP 1-94 AND THE OEM NUMBER IS OF A LATER DESIGN THAN CLYINDER P/N DESCRIBED IN SB M86-7 AND AD 86-13-04R3 RELATING TO CERTAIN OEM CYLINDERS). SUBMITTER NOTES CYLINDER WALLS HAD BEEN RECONDITIONED BY CHROME-PLATING AND NEW HEAD PARTS HAD BEEN INSTALLED AT THIS TIME OF RECONDITIONING. SUBMITTER SUGGESTS POSSIBILITY OF AN UNDETECTED CYLINDER HEAD CRACK BETWEEN CYLINDER FINS PROGRESSED TO SEPARATION AFTER PROLONGED HEAT AND CYCLE.