AN SMT HAS AN ENG FAIL INFLT. PLT DIVERTS TO CAK; OH.

Narrative

DURING CRUISE ON A RETURN TRIP FROM MGW TO TOL; THE L ENG FAILED. FIRST INDICATION WAS A VIBRATION AND SURGING OF THE RPM. I MADE ATTEMPTS TO SOLVE THE PROB BY SWITCHING FULL TANKS AND ADJUSTING MIXTURE. AFTER THE ENG QUIT; THE PROP WAS FEATHERED AND THE ENG SECURED. AN EMER WAS DECLARED AND WE REQUESTED LNDG AT CAK. LNDG WAS MADE WITHOUT FURTHER PROBS. THE ENG HAD BEEN REPAIRED BY OUR OWN MAINT DEPT PRIOR TO THE FAILURE AND HAD APPROX 100 HRS SINCE THE REPAIR. THE LOGBOOKS SHOWED CYLINDERS REPLACED. THE ENG WAS SUSPECT TO MYSELF AND ONE OTHER CAPT AFTER THE REPAIR. SOME INDICATIONS WERE AN ABNORMAL STARTING (THE ENG WOULD STOP DURING CRANKING AND THEN ROTATED NORMALLY). ALSO; INTERMITTENT VIBRATION DURING FLT; AND DIFFICULTY SYNCHRONIZING ENGS. FUEL FLOW; ENG OIL PRESSURE; OIL TEMP AND CYLINDER HEAD TEMP WERE ALL IN THE NORMAL OPERATING RANGE PRIOR TO THE FAILURE. THE CAUSE OF THE FAILURE IS YET TO BE DETERMINED; BUT INITIAL INDICATIONS ARE A BROKEN CAM SHAFT OR CRANK SHAFT. THE PROP ROTATES BY HAND WITH LITTLE RESISTANCE; AND THE VALVE IN THE #1 CYLINDER DOES NOT MOVE AFTER THE PROP IS ROTATED.