TM  10-3930-643-34 GENERAL 13-11. SUPPORT  ENGINE,  FUEL,  EXHAUST  AND  COOLING  MAINTENANCE. Engine oil Pump. (Sheet 1 of 5) CLEANING/INSPECTION 5. Inspect housing (3), inner rotor (5), outer rotor (8) and plate (6) for nicks,  burrs,  scoring  or unusual wear. 6. Install outer rotor (8) in housing (3). 7. Check clearance between outer rotor (8) and housing (3) with feeler gage. Clearance must be 0.0055 to 0.0095 inches. ASSEMBLY 8. Install new preformed packing (7), plate (6), inner rotor (5) and outer rotor (8) on front cover. Place plastigage  strip  across  rotors  (5  and 8). 9. Using a 1/2”   socket  and  socket  wrench handle, install preformed packing (4), housing (3), six washers (2) and lock screws (1) on rear cover. 10. Using a 1/2”   socket and socket wrench handle, remove and discard six lock screws (1), washers (2), housing (3) and preformed packing (4). Discard preformed  packing  (4). 11. Measure   plastigage. Clearance between rotors (5 and 8) and housing (3) must be 0.0015 to 0.0043 inches. Go to sheet 5 13-75