(b)  
Remove the turbine exhaust plug (AMM 78-11-02/401).

 (c)  
Remove the bolts that attach the shield to the No. 4 bearing and the rear inner flange of the turbine exhaust case.

 (d)  
Remove the shield.

 (e)  
Remove the heat shield on the No. 4 bearing.

 S 024-032-N00
 (2)  
ENGINES PRE-PW-SB 72-385; Do the steps that follow to remove the No. 4 bearing cover:

 (a)  
Attach the Jackscrew Puller (PWA 85307) to the cover on the No. 4 bearing.

 NOTE: The Jackscrew Puller attaches to the bearing cover with
____
 six screws.

 (b)  Turn the jackscrew T handle to remove the cover from the inner flange of the turbine exhaust case.
 NOTE: For engines POST-PW-SB 79-76, it will be necessary to
____ angle the cover and heat shield to clear the No. 4 bearing oil pressure tube.
 (c)  Discard the packing.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 72-54-05
 ALL  ú ú N01 Page 404 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(d)  Remove the Jackscrew Puller from the cover.
 S 024-033-N00
 (3)  
ENGINES POST-PW-SB 72-385;
 Do the steps that follow to remove the No. 4 bearing cover.

 (a)  
Install and equally tighten eight 0.190-32 jackscrews to remove the cover.

 TASK 72-54-05-404-034-N00
 3. Install the No. 4 Bearing Shield and Cover (Fig. 401)
__________________________________________
 A. Consumable Materials
 (1)  
D00390 Engine Oil - PWA 521B

 (2)  
G00964 Antigalling Compound - PWA 586

 (3)  
G00835 Leak Check, Bubble Type

 B.
References

 (1)  
AMM 78-11-02/401, Turbine Exhaust Plug

 (2)  
AMM 78-31-00/201, Thrust Reverser System

 (3)  
AMM 70-21-00/201, Locking Methods

 C.
Access

 (1)  
Location Zone
 412 Engine 1 - Turbine Exhaust Case
 422 Engine 2 - Turbine Exhaust Case
 432 Engine 3 - Turbine Exhaust Case
 442 Engine 4 - Turbine Exhaust Case

 D.
Procedure

 S 424-035-N00
 CAUTION: YOU MUST APPLY ENGINE OIL FULLY TO THE COVER PACKING OR YOU
_______ WILL CUT THE PACKING DURING INSTALLATION. A CUT PACKING WILL CAUSE SUBSEQUENT OIL LOSS AND CAN CAUSE AN IN-FLIGHT SHUTDOWN.
 CAUTION: INSTALL THE COVER INTO POSITION USING EIGHT TO TEN WORK BOLTS
_______ EQUALLY SPACED AROUND THE COVER. TIGHTEN THE BOLTS EQUALLY IN SMALL INCREMENTS TO PULL THE COVER INTO POSITION EQUALLY. MONITOR THE ENGAGEMENT OF THE COVER TO MAKE SURE THAT THE PACKING IS NOT CUT DURING INSTALLATION. A CUT PACKING WILL CAUSE SUBSEQUENT OIL LOSS AND CAN CAUSE AN IN-FLIGHT SHUTDOWN.
 (1)  
Do the steps that follow to install the bearing cover:

 (a)  
Refer to the table that follows for the clearance between the cover of the No. 4 bearing and the inner flange of the turbine exhaust case.

 NOTE: It is not necessary to measure this unless there is a
____
 problem with the fit.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 72-54-05
 ALL  ú ú N01 Page 405 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
~.............................................................................

 |  |  |  NEW PART REFERENCE  |  CLEARANCE  |
 |  |  |  DIMENSIONS  |  LIMITS  |
 |  |  |  INCHES  |  INCHES  |
 |  PART  |  |  (MM)  |  (MM)  |
 |  NAME  | DIA  .......................... ..... ..... .......... ..... ...
 |  |  |  MIN  |  MAX  |  MIN  |  MAX  |
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 發動機 ENGINE 2(116)