THE ACFT WAS FOUND FLOATING INVERTED ABOUT 1.5 MI FROM THE POINT OF DEPARTURE. THE TAILBOOM HAD SEPARATED & THERE WAS EVIDENCE THAT THE M/R BLADES HAD STRUCK THE TAILBOOM. THE WINDSHIELD & CHIN BUBBLE WAS BROKEN OUT. AN OIL PUMP GEAR TOOTH WAS FOUND ADHERING TO THE LOWER CHIP DETECTOR PLUG. THE OIL PUMP HAD 3 TEETH MISSING FROM A GEAR. THERE WAS EVIDENCE OF A SMOOTH ROUND OBJECT GOING THROUGH THE PUMP & JAMMING THE GEAR TEETH. THE BALL SEPARATOR GAGE FOR A BEARING (MRC P/N 6859435-G) HAD BROKEN APART ALLOWING BALLS TO FALL OUT. THE GEAR WHICH DRIVES THE FUEL CONTROL & OIL PUMP THEN MOVED SIDEWAYS FAR ENOUGH TO BECOME UNCOUPLED FROM ITS DRIVE GEAR. THE SEVEN TANGS ON ONE-HALF OF THE BALL SEPARATOR CAGE HAD SEPARATED. THE SEPARATED BEARING WAS NOT AN AUTHORIZED TYPE FOR USE IN THIS ENGINE. THE ENGINE MANUFACTURER ISSUED A COMMERCIAL ENGINE BULLETIN DATED 9/30/82 CALLING FOR ALL UNAUTHORIZED BEARINGS TO BE REMOVED FROM SPARE STOCK & SCRAPPED.