79-21-09
 ALL  ú ú N03 Page 414 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
c)  Lubricate the threads of the jamnut (44), which attaches the drain tube (40) to the air/oil heat exchanger (1), with engine oil.
 d) Attach the coupling on the drain tube (40) to the air/oil heat exchanger (1) with the jamnut (44). e) Tighten the jamnut (44) to 70-80 pound-inches (7.909-9.039 newton-meters).
 2)  ENGINES POST-PW-SB 79-49 AND PRE-PW-SB 79-50; Do the steps that follow: a) Lubricate the threads of the smaller adapter (34) with
 the antigalling compound.
 b)  Attach the drain tube (40) to the adapter (34) and to the hole in the tube flange on the air/oil heat exchanger (1). 1 Install the plate between the flats on the drain
_ tube (40) and the flange. c) Lubricate the threads on the coupling end of the drain tube (40) with engine oil. d) Attach the coupling end of the drain tube (40) with a washer and a jamnut (44). e) Tighten the jamnut (44) to 70-80 pound-inches (7.909-9.039 newton-meters).
 3)  ENGINES POST-PW-SB 79-49 AND POST-PW-SB 79-50; Do the steps that follow: a) Lubricate the threads of the smaller adapter (34) with
 the antigalling compound. b) Attach the tube nut for the drain tube (40) to the adapter (34).
 c)  Lubricate the threads of the bolts, which attach the drain tube (40) to the air/oil heat exchanger (1), with engine oil.
 d) Attach the drain tube (40) to the air/oil heat exchanger (1) with the bolts. e) Tighten the bolts to 32-36 pound-inches (3.616-4.067 newton-meters). 4) Tighten the tube nut for the drain tube (40) to 90-100 pound-inches (10.169-11.298 newton-meters).
 5)  Install the lockwire or safety cable and safety cable ferrule on the tube nut and, if installed, the bolts or the jamnut.
 (h)  Install the supply tube (41) and the return tube (42) with the steps that follow: 1) ENGINES PRE-PW-SB 79-49;
 Do the steps that follow: a) Lubricate the threads on the remaining adapters (36) with the antigalling compound.
 b)  Attach the return tube (42) and the supply tube (41) to the adapters (36), with the couplings on the tubes through the tube flange on the air/oil heat exchanger (1).
 c)  Lubricate the threads of the couplings with engine oil.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 79-21-09
 ALL  ú ú N03 Page 415 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
d) Attach the couplings with the jamnut (44). e) Tighten the jamnuts (44) to 70-80 pound-inches (7.909-9.039 newton-meters).
 2)  ENGINES POST-PW-SB 79-49 AND PRE-PW-SB 79-50; Do the steps that follow: a) Lubricate the threads on the remaining adapters (36)
 with the antigalling compound.
 b)  Attach the return tube (42) and the supply tube (41) to the remaining adapters (36). 1 Put the couplings on the tubes through the plate and
_
 the flange on the air/oil heat exchanger (1). c) Lubricate the threads on the couplings with engine oil. d) Attach the couplings to the tubes with the washers and
 the jamnuts (44). e) Tighten the jamnuts (44) to 70-80 pound-inches (7.909-9.039 newton-meters).
 3)  ENGINES POST-PW-SB 79-49 AND POST-PW-SB 79-50; Do the steps that follow: a) Lubricate the threads on the remaining adapters (36)
 with the antigalling compound. b) Attach the return tube (42) and the supply tube (41) to the adapters (36). c) Lubricate the threads of the bolts, which attach the tubes to the air/oil heat exchanger (1). d) Attach the return tube (42) and the supply tube (41) to the air/oil heat exchanger (1) with the bolts. e) Tighten the bolts to 32-36 pound-inches (3.616-4.067 newton-meters).
 4)  Tighten the tube nuts for the return tube (42) and the supply tube (41) to 200-225 pound-inches (22.597-25.422 newton-meters).
 5)  Install the lockwire or safety cable and safety cable ferrule to the tube nuts and, if installed, the bolts or jamnuts.
 (i)  
Lubricate the threads of the bolts, which attach the drain tube (40) and the supply tube (41) together, with engine oil.
　
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