What was found
ON FIRST FLIGHT AFTER MAINTENANCE (STARTER REPLACEMENT) ON 8-29-95, 25 MINUTES INTO FLIGHT, HAD SUDDEN ONSET OF ENGINE VIBRATION. HEADED TOWARD AIRPORT. WITHIN 1 MINUTE HAD COMPLETE LOSS OF OIL PRESSURE. OVER NEXT FEW MINUTES, HAD OIL TEMP PAST RED LINE AND OFF SCALE, OIL PRESSURE REMAINED ZERO, VIBRATION WORSENED, HAD PARTIAL POWER LOSS, AND BURNING ODOR. WAS ABLE TO RETURN AND LAND WITH PARTIAL POWER (ABOUT 10-12 INCHES MP). NO DAMAGE TO AIRFRAME. SUBSEQUENT INSPECTION FOUND MECHANICAL PROBLEMS RELATED TO THE RECENT MAINTENANCE.