(g)
Connect the upper and lower sections of the No. 4 bearing scavange tube at the bracket attached to Flange N. 1) Tighten the tube nut with your hand.
(h)
Tighten the bolts, which attach the tube clamps on the No. 4 bearing scavenge tube, to 36-40 pound-inches (4.1-4.5 newton-meters).
(i)
Tighten the tube nut at the exhaust case to 200-225
pound-inches (22.6-25.4 newton-meters).
(j)
Safety the tube nut on the exhaust case with lockwire or safety cable and safety cable ferrule.
(k)
Tighten the tube nuts at the Flanges M and N location to 475-525 pound-inches (53.7-59.3 newton-meters).
(l)
Safety the tube nuts with lockwire or safety cable and safety cable ferrule.
(m)
Do the steps that follow to install the spray shield: 1) Put the spray shield to the inboard side of the No. 4
bearing scavenge tube at the tube nut on Flange N. 2) Attach the upper end of the spray shield with a clamp. 3) Tighten the clamp to 15-18 pound-inches (1.7-2.0
newton-meters).
4) Lubricate the threads of the bolt, which attaches the tube clamp on the spray shield to the bracket on Flange N, with oil.
5) Attach the tube clamp to the Flange N bracket with the bolt and nut. 6) Tighten the bolt to 36-40 pound-inches (4.1-4.5 newton-meters).
S 414-144-N00
(29)
ENGINES PRE-PW-SB 79-76; Install the oil pressure tube for the No. 4 bearing with the steps that follow (Views A and E):
(a)
Remove the protection caps from the tube fittings.
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(b)
Lubricate the tube nut threads of the center section of the oil pressure tube with the antigalling compound.
(c)
Install the center section of the oil pressure tube at Flange P at the 10:30 o'clock position and forward of Flange M at 10 o'clock position. 1) Tighten the tube nuts with your hand.
(d)
Lubricate the threads of the bolt, which attaches the tube clamp to the oil scavenge tube, with engine oil.
(e)
Install the clamp which attaches the oil pressure tube to the oil scavenge tube with the bolt, nut and spacer.
(f)
Lubricate the threads of the bolts, which attach the clamps to the brackets on Flanges M, N, and P, with engine oil.
(g)
Install the tube clamps on the oil pressure tube to the brackets on Flanges M, N, and P with the bolts and nuts.
(h)
Tighten all bolts which attach the clamps on the oil pressure tube to 36-40 pound-inches (4.1-4.5 newton-meters).
(i)
Tighten the tube nuts at each end of the oil pressure tube to 450-500 pound-inches (50.8-56.5 newton-meters). 1) Safety the tube nuts with lockwire or safety cable and
safety cable ferrule.
(j)
Install the spray shield to the inboard side of the connection for the oil pressure tube at the 10:30 o'clock position at Flange P.
(k)
Attach the spray shield with the hose clamps.
1) Tighten the hose clamps to 15-18 pound-inches (1.7-2.0 newton-meters).
(l)
ENGINES PRE-PW-SB 79-54; Install the spray shield at Flange M with the steps that follow: 1) Install the spray shield to the inboard side of the front
connection for the oil pressure tube at Flange M with the hose clamps. a) Tighten the hose clamps to 15-18 pound-inches (1.7-2.0
newton-meters).
(m) ENGINES POST-PW-SB 79-54; Install the spray shield at Flange M with the steps that follow:
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
1) Install the spray shield to the inboard side of the front connection for the oil pressure tube at Flange M with the hose clamp.
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