ARMY TM 9-2805-257-14 AIR FORCE TO 38G2-103-2 NAVY NAVFAC P-8-612-14E 4-16. Lower Air Duct and Upper Air Duct. This  task  covers: a.  Removal b. Repair c.  Installation INITIAL  SETUP Tools Materials/Parts General  Mechanic’s  Tool  Kit  (Item  1,  Appendix  B) Rags, Wiping (Item 6, Appendix D) Solvent,  Drycleaning  (Item  7,  Appendix  D) a. Removal.  (figure 4-5) (1) Remove four screws (1) and washers (2) securing lower air duct (3) to oil pan (4). (2) Remove screw (5), washer (6) and nut (7) and remove lower air duct (3). (3) Remove three screws (8) and washers (9) and remove upper air duct (10). b. Repair. (figure 4-5) WARNING Drycleaning  solvent  PD-680  used  to  clean  parts  is  potentially  dangerous  to  personnel  and property. Avoid repeated and prolonged skin contact. Do not use near open flame or excessive heat. Flash point of solvent is 100°F–138°F (38°C–60°C). (1) Clean lower air duct (3) and upper air duct (10) with dry cleaning solvent and dry thoroughly. (2) Repair all dents and repaint as necessary. c.  Installation. (figure 4-5) (1) (2) (3) 4-16 Install upper air duct (10) and secure with three screws (8) and washers (9). Install lower air duct (3) and secure with screw (5), washer (6) and nut (7). Secure lower air duct (3) to oil pan (4) using four screws (1) and washers (2).