(l)
Lubricate the threads of the bolt, which attaches the tube clamp for the oil vent tube, with engine oil.
(m)
Attach the tube clamp for the oil vent tube to the adjacent tube clamp approximately half the distance between the flange N and flange P with the bolt and nut. 1) Tighten the bolt with your hand.
(n)
Tighten the tube nuts for the oil vent tube to 200-225 pound-inches (22.5-25.4 newton-meters). 1) Safety the tube nuts with lockwire or safety cable and
safety cable ferrule.
(o)
Tighten all bolts which attach the tube clamps to 36-40 pound-inches (4.1-4.5 newton-meters).
S 414-081-N00
(27)
ENGINES PRE-PW-SB 79-76; For the lower cooling air tubes, install the oil scavenge tube for the No. 4 bearing with the steps that follow (views A and E):
(a)
Remove the protection caps.
(b)
Lubricate the threads of the tube nut for the oil scavenge tube with the Fel-Pro C-200 antigalling compound.
(c)
Connect the tube nut for the oil scavenge tube to the internal tube on the turbine exhaust case.
(d)
Connect the tube nut at the other end to the tube adapter on the forward scavenge tube at the flange M. 1) Tighten the tube nut with your hand.
(e)
Lubricate the threads of the bolt, which attaches the clamp at the flange P location, with engine oil.
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ALL ú ú N01 Page 428 ú Jun 18/99
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(f)
Attach the clamp at the flange P location to the bracket with the bolt and nut. 1) Tighten the bolt with your hand.
(g)
Lubricate the threads of the bolts, which attach the tube clamps at the flange N bracket, with engine oil.
(h)
Attach the tube clamps at the three flange N bracket locations to the brackets with the bolts and nuts. 1) Tighten the bolts with your hand.
(i)
Tighten the bolts for the tube clamps to 36-40 pound-inches (4.1-4.5 newton-meters).
(j)
Tighten the tube nut at the turbine exhaust case to 200-225 pound-inches (22.6-25.4 newton-meters). 1) Safety the tube nut with lockwire or safety cable and
safety cable ferrule.
(k)
Tighten the tube nut at the flange M to 475-525 pound-inches (53.7-59.3 newton-meters). 1) Safety the tube nut with lockwire or safety cable and
safety cable ferrule.
(l)
Install the spray shield on the forward tube connection to the inboard side of the flange M.
(m)
Attach the aft end of the spray shield with the clamp.
(n)
Attach the forward end of the spray shield with the hose clamp.
(o)
Lubricate the threads of the bolt, which attaches the aft end, with engine oil.
(p)
Attach the aft end clamp to the flange M bracket with the bolt and nut.
(q)
Tighten the hose clamp at the forward end to 15-18 pound-inches (1.7-2.0 newton-meters).
(r)
Tighten the bolt for the tube clamp to 36-40 pound-inches (4.1-4.5 newton-meters).
S 414-143-N00
(28) ENGINES POST-PW-SB 79-76; Install the No. 4 bearing scavenge tube (Fig. 402).
(a)
Put the upper section of the No. 4 bearing scavenge in position.
(b)
Lubricate the tube elbow threads with lubricant.
(c)
Attach the tube elbow to the tube nut on the exhaust case. 1) Tighten the tube nut with your hand.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
75-24-07
ALL ú ú N01 Page 429 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(d)
Put the lower/forward section of the No. 4 bearing scavenge tube inboard of the deoiler outlet tube and LPT bridge brackets.
(e)
Lubricate the tube adapter threads with lubricant.
(f)
Attach the tube adapter to the tube nut at Flange M.
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