(2 LOCATIONS)  LOWER (2 LOCATIONS) JUNCTION BOX

Lower EGT Thermocouple Harness and Probe Installation
Figure 404 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 9 PROBE EGT SYSTEM (SOFT MOUNT) ú  77-21-01
 ú CONFIG 3 ú C03 Page 423 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(c)  
Carefully remove the probes from the engine.

 (d)  
Put protective caps on the probes and the engine bosses.

 TASK 77-21-01-404-010-C03
 9. Lower EGT Thermocouple Harness and Probes Installation
______________________________________________________
 A. Equipment
 (1)  Fork Wrench - AN8508-14, Snap-on Tools Company, 8049-28th St Kenosha, WI 53140
 B. Consumable Materials
 (1)  D00601, Grease, (CP2101) graphite - GP460, Aeroshell 8
 C. References
 (1)  
AMM 71-11-02/201, Fan Cowl Panels

 (2)  
AMM 77-21-00/501, EGT Indicating System

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 D. Access
 (1)  
Location Zones
 504 Left Engine - Left Side
 505 Left Engine - Right Side
 604 Right Engine - Left Side
 605 Right Engine - Right Side

 (2)  
Access Panels
 5738L Left Thrust Reverser - Left Engine
 5739L Right Thrust Reverser - Left Engine
 5838R Left Thrust Reverser - Right Engine
 5839R Right Thrust Reverser - Right Engine

 E. Procedure
 S 424-041-C03
 (1)  Do these steps to install the probes (Fig. 404):
 (a)  
Remove protective caps from the probes and the engine bosses.

 (b)  
Carefully install the probes in the engine bosses.

 (c)  
Install the lower probe, then the center probe, and then the upper probe.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 9 PROBE EGT SYSTEM (SOFT MOUNT) ú  77-21-01
 ú CONFIG 3 ú C05 Page 424 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(d)  
Apply a thin layer of antiseize compound to the bolts that attach the probes.

 (e)  
ENGINES WITH EGT AIR DEFLECTORS;
 Put the EGT air deflector on each probe.

 NOTE: A deflector is not installed at the No. 1 probe.
____
 (f)  Install two bolts to attach each probe. 1) Tighten each bolt to 100-110 pound-inches (11.5-12.5 N.m). 2) Install a lockwire or a safety cable on each bolt.
 S 434-182-C03
 (2)  Do these steps to attach the connector:
 (a)  
Remove protective caps from the connector and the receptacle.

 (b)  
Connect the connector (on the lower extension harness) to the lower junction box. 1) Tighten the connector with the fork wrench to

 170-190 pound-inches (19-21 N.m). 2) Install a lockwire or a safety cable on the connector.
 S 424-043-C03
 (3)  Do these steps to attach the harness:
 (a)  
Apply a thin layer of antiseize compound to the bolts.

 (b)  
Install the two bolts and the two nuts that attach the lower junction box to the engine flange. 1) Tighten the nuts to 100-110 pound-inches (11.5-12.5 N.m).

 (c)  
Install the bolt and the clamp that attach the harness to the engine bracket. 1) Tighten the bolt to 50-55 pound-inches (5.5-6.5 N.m).

 (d)  
Install the bolt and the two clamps that attach the leads of the harness together and to the engine bracket. 1) Tighten the bolt to 50-55 pound-inches (5.5-6.5 N.m).

 F. Put the Airplane Back to Its Usual Condition
 S 414-104-C03
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU CLOSE THE
　
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