(d)  
Remove the PWA 86018 adapter.

 (e)  
Install the magnetic chip detector (AMM 79-21-10/401).

 (f)  
Examine the engine oil sample for these conditions: very dark color, high viscosity, an increased Total Acid Number (TAN)

 NOTE: If you do not find these conditions, and you think
____ the oil is satisfactory, no more inspection is necessary.
 See P&W SB 238 for oil quality limits.
 S 216-087-N00
 (6)  
Examine the main gearbox for these conditions: discoloration, distortion, and burned areas.

 (a)  
If you find any signs of those conditions, remove and repair the engine.

 S 686-088-N00
 (7)  
Drain the engine oil (AMM 12-22-03/301).

 S 216-089-N00

 (8)  
Examine the No. 4 bearing shield and the cover.

 (a)  
Open the No. 4 bearing compartment (AMM 72-54-05/401).

 (b)  
Examine the packing for deterioration.
 1) Examine the bearing cover for coke.

 (c)  
Examine the bearing compartment for coke.

 1)  Remove the engine if you find coke in the bearing cover or compartment (AMM 71-00-02/401).
 NOTE: The carbon seal or oil nozzle of the No. 4
____ bearing is possibly damaged.
 2)  If you do not find coke, close the No. 4 bearing compartment (AMM 72-54-05/401).
 S 216-090-N00
 (9)  
Examine the angle gearbox for coke (Fig. 605).

 (a)  
Remove the fan exit lining that is at the 6 o'clock position (AMM 72-34-03/401).

 (b)  
Remove the angle gearbox plug (AMM 72-62-01/401) and examine the packing for deterioration. 1) Examine the gears in the angle gearbox for coke.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 7 - Oil Overtemperature Inspection/Check
____________________________________________
 2)  If you find coke, remove the engine (AMM 71-00-02/401).
 NOTE:____ The carbon seals or the oil nozzles of the
 No. 1, 1.5 and 2 bearing compartment are possibly
 damaged.
 3)  If you do not find coke, install the angle gearbox plug
 (AMM 72-62-01/401).
 a)  Install the fan exit lining segment at the 6 o'clock
 position (AMM 72-34-03/401).

 S 216-091-N00
 (10)
 Examine the No. 3 bearing breather tube assemblies for coke (Fig. 606).

 (a)  
Remove the upper breather tube. 1) Remove the lockwire and loosen the lower tube nut and the internal tube nut of the diffuser case. 2) Remove the clamp bolts and nuts that attach the tube to the

 brackets. 3) Remove the tube.

 (b)  
Remove the lower breather tube. 1) Remove three bolts that attach the tube to the main gearbox.

 2)  ENGINES PRE-PW-SB 72-211; Remove the clamp bolt that attaches the tube to the bracket which is installed at the rear mount of the oil cooler.
 3)  ENGINES POST-PW-SB 72-211; Remove the clamp bolt that attaches the tube to the bracket which is installed at the HPC secondary flow control valve.
 4)  Remove the tube and discard the packing.
 (c)  Examine the upper and lower breather tube and the inner surface of the internal tube of the diffuser case for coke. 1) Remove the engine if you find coke (AMM 71-00-02/401)
 NOTE: The carbon seals or oil nozzle of the No. 3 bearing
____ are possibly damaged.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ANGLE GEARBOX
SEE B
SEE A
(4 LOCATIONS) BOLT ANGLE GEARBOX COVER  PACKING PLUG FWD  PACKING  PLUG PWA 85518 PULLER 
　
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