lubricated with engine oil, and washers.
2) Tighten the bolts that attach the nozzle to the exhaust case and bolts that attach the damper supplu tube to the nozzle to 75-85 pound-inches (8.474-9.604 newton-meters). a) Bend the tabs of the wahsers.
S 412-030-N00
(17)
ENGINES POST-PW-SB 72-472; Install a clean No. 4 bearing front nozzle assembly and the packing transfer tube (the damper tube to the front nozzle) as follows (Fig. 201):
(a)
Lubricate two packings with engine oil.
(b)
Install the packings in the grooves of the packing transfer tube.
(c)
Put one end of the tube into the port on the front No. 4 bearing nozzle.
(d)
Align the bolt holes in the flange of the front nozzle with the two retainer plate bolt holes at the 12 o'clock position. 1) Put the nozzle through the hole in the No. 4 bearing
support flange at the 12:30 o'clock position.
(e)
Put the end of the transfer tube in the port in the elbow of the No. 4 bearing damper supply tube.
(f)
Put the retaining plate, chamfered side out, on the retainer plate pad (under the nozzle flange).
(g)
Put the key washer on the oil nozzle flange, and install two bolts, with threads lubricated with engine oil.
(h)
Make sure that the clearance gap between the retaining plate and the grooves in the bearing outer race is 0.10-0.050 inch (0.25-1.27 mm). 1) Tighten the bolts that attach the retainer plate to 75-85
pound-inches (8.474-9.604 newton-meters). 2) Bend the tabs of the key washers.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
72-54-01
ALL ú ú N01 Page 215 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 412-016-N00
(18)
Install a clean No. 4 bearing scavenge (inner) tube as follows (Fig. 202, Sheet 1).
(a)
Install a new gasket in the groove in the recessed pad in the No. 4 bearing housing rear inner diameter.
(b)
Align the bolt holes in the flange of the No. 4 bearing oil scavenge tube with the bolt holes in the recessed pad.
(c)
Also align the bolt holes in the tube bracket with the bolt hole in the No. 4 bearing housing inner diameter.
(d)
Connect the tube with three bolts to 32-36 pound-inches (3.616-4.067 newton-meters). 1) Bend the tabs of the key washers.
S 412-018-N00
(19)
Install the No. 4 bearing scavenge (outer) tube as follows (Fig. 202, Sheet 3):
(a)
Remove the covers from the openings.
(b)
Install the No. 4 bearing tube guide onto the scavenge tube.
(c)
Install the scavenge tube, with the straight end first, into the opening in the exhaust case inner wall and through the strut at approximately the 10:30 o'clock location.
(d)
Connect the tube nut detail lubricated with engine oil, to the adapter in the rear inner location. 1) Tighten the nut with your hand.
(e)
Install the two bolts, lubricated with engine oil, to attach the tube guide to the inner wall of the case. 1) Tighten the bolts with your hand.
(f)
Apply air at a minimum pressure of 10 psig (68.9 kPa) to the outboard end of the tube.
(g)
Make sure that air flows through the scavenge tube in the sump.
(h)
Air leaks are permitted, because this is not a test.
(i)
If the airflow is blocked, remove and install the No. 4 bearing oil scavenge tube (inner and outer) again to find the cause. 1) Tighten the two bolts that hold the tube guide to 75-85
pound-inches (8.474-9.604 newton-meters).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
72-54-01
ALL ú ú N01 Page 216 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
2) Install lockwire or safety cable and cable safety ferrule.
(j)
Use a wrench to hold the adapter while you torque the tube nut to 320-350 pound-inches (36.155-39.545 newton-meters). 1) Install lockwire.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747-400 AMM 飞机维护手册 发动机 ENGINE 2(108)
