(i)  
Remove the upper section of the oil pressure tube from the engine and install protective caps on the tube.

 (j)  
Remove the clamps, which attach the spray shield at the tube nut, on the oil strainer housing on the engine case.

 (k)  
Remove the spray shield from the engine.

 (l)  
Disconnect the tube nut from the strainer housing.

 (m)  
Remove tube clamp which attaches the lower section of the pressure tube to Flange P.

 (n)  
Remove tube clamps on the LPT Bridge Bracket (2 locations).

 (o)  
Remove tube clamps at Flange N (2 locations).

 (p)  
Remove the lower section of the oil pressure tube from the engine.

 (q)  
Install protective caps.

 (r)  
Remove the strainer housing aft of Flange P, at the engine case. 1) Remove the strainer element. 2) Remove and discard packing from the groove in the strainer

 element.
 S 014-005-N00
 (5)  
ENGINES PRE-PW-SB 79-76; For the lower cooling air tubes, remove the scavenge oil tube for the No. 4 bearing with the steps that follow (views A and E):

 (a)  
Disconnect the tube nut for the oil scavenge tube from the internal tube for the turbine exhaust.

 (b)  
Remove the bolt and nut which attach the clamp on the aft end of the spray shield to the bracket on the flange M.

 (c)  
Remove the clamp from the aft end of the spray shield.

 (d)  
Remove the hose clamp which attaches the forward end of the spray shield. 1) Remove the spray shield.

 (e)  
Disconnect the tube nut at the flange M from the tube adapter.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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(f)  
Remove the bolt and nut which attach the tube clamp to the bracket on the flange P.

 (g)  
Remove the bolt, spacer, and nut which attach the tube clamp to the adjacent tube clamp to the rear of the flange N at the 9 o'clock location.

 (h)  
Remove the bolts and nuts which attach the tube clamps to the brackets on the flange N and to the bridge brackets for the LPT tube.

 (i)  
Remove the oil scavenge tube from the engine.

 (j)  
Install the protection caps to the openings of the oil scavenge tube.

 S 014-108-N00
 (6)  ENGINES POST-PW-SB 79-76; Remove the No. 4 bearing scavenge tube assembly (Fig. 402).
 (a)  
Disconnect the scavenge tube from the internal tube on the engine case.

 (b)  
Remove the bolt which attaches the tube clamp to the bracket on Flange P (4 locations). 1) Remove the tube clamps.

 (c)  
Remove the bolts which attach the tube clamps to the brackets on the LPT Bridge Bracket (2 locations). 1) Remove the tube clamps.

 (d)  
Remove clamps that attach the spray shield to the tube nut located aft of Flange N. 1) Remove the spray shield from engine.

 (e)  
Disconnect the tube nut aft of Flange N.

 (f)  
Remove the upper section of the No. 4 scavenge tube and install protective caps.

 (g)  
Remove the bolts which attach the tube clamps on Flange N (2 locations). 1) Remove the clamps.

 (h)  
Remove the bolt which attaches the clamp and the aft end of the spray shield to the bracket on Flange M. 1) Remove the tube clamp.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(i)  
Remove the clamp which attaches the forward end of the spray shield to the tube. 1) Remove the tube clamp and spray shield.

 (j)  
Disconnect the tube nut at Flange M from the tube adapter.

 (k)  
Remove the lower section of the No. 4 bearing scavenge tube from engine and install protective caps.
　
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