What was found
DURING LEVEL FLIGHT AT 8,500 FEET, PROPELLER SURGE OCCURRED. OBSERVED ZERO RPM, ZERO OIL PRESSURE. SHUT DOWN ENGINE. STOPPED PROPELLER. GLIDE TO NEAREST AIRPORT 9.8 MILES. LANDED ON RUNWAY, ROLL OUT TO RAMP AREA. TEST, NO OIL PRESSURE, NO TACHOMETER. SUBMITTER SUSPECTED DRIVE GEAR. TEAR DOWN, REMOVED AND REPLACED. LEAK CHECK TEST RUN. TEST FLY OK. PART APPEARED OVERTORQUED BY ASSEMBLER AT OVERHAUL.