What was found
SHORTLY AFTER DEPARTURE FROM SIOUX, THE PILOT NOTICED THE LEFT ENGINE MANIFOLD PRESSURE DROPPING OFF AND THE ENGINE LOSING POWER. ALL OTHER ENGINE INDICATORS SHOWED NORMAL BUT, AS A PRECAUTION, THE LEFT ENGINE WAS SHUT DOWN AND SECURED. THE PILOT RETURNED TO THE AIRPORT AND MADE AN UNEVENTFUL LANDING. UPON INVESTIGATION BY MAINTENANCE PERSONNEL, IT APPEARED AS THOUGH THE TURBINE WHEEL OF THE TURBO CHARGER HAD RUBBED AGAINST THE HOUSING. THIS WAS A NEWLY INSTALLED TURBO CHARGER WITH ZERO HOURS ON IT.