Oil Pump Assembly: Inspection

Check seal rings and "O" rings for breaks or damage. Check oil pump housing and cover for dents or damage. Install inner and outer rotor gears into oil pump housing. With rotor gears facing each other, measure crest-to-crest (tip) clearance. See Figure . Using a depth micrometer, measure side clearance. Ensure both clearance measurements are within specification. See OIL PUMP COMPONENT SPECIFICATIONS  table. If either measurement is not within specification, replace with appropriate selective rotor. See SELECTIVE OIL PUMP ROTOR  table.