S 374-012
 WARNING:_______ DO NOT BREATHE THE VAPORS OF FINISHES AND SOLVENTS.
 THEY CONTAIN TOXIC AND FLAMABLE COMPONENTS.  USE APPROVED
 RESPIRATORY PROTECTION AS NECESSARY.  DO NOT GET IN EYES OR ON
 SKIN AND CLOTHING.  KEEP MATERIALS AWAY FROM SOURCE OF
 IGNITION.  INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 CAUTION:_______ DO NOT APPLY FINISHES WHEN AMBIENT TEMPERATURE IS LESS THAN
 50 DEGREES FAHRENHEIT OR RELATIVE HUMIDITY IS MORE THAN 85

 PERCENT.
 (4)  
Spray apply paint and make sure you have a sufficiently wet layer to get uniform flowout but not to cause runs and sags.

 S 354-011

 (5)  
After the marking is dry, remove rough edges from the markings with BMS 3-2 solvent or a burnishing tool.

 NOTE: Another procedure to remove rough edges is to remove masking
____ tape while paint film is still wet. This permits paint to flow out.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 20-10-15
 ALL  ú ú 01 Page 405 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 RECESSED BOSS SEAL FITTINGS - REMOVAL/INSTALLATION
__________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of the fitting from the boss. The second task is the installation of the fitting into the boss.
 TASK 20-10-16-004-001
 2.  Remove the Fitting from Boss (Fig. 401)____________________________
 A.  Procedure
 S 034-002
 (1)  
Loosen the jamnut.

 S 034-003

 (2)  
Disconnect the elbow fitting from the hose or tube, as applicable.

 S 024-004

 (3)  
Loosen the fitting from the boss and remove.

 TASK 20-10-16-404-005
 3.  Install the Fitting into Boss (Fig. 401)_____________________________
 A.  Procedure
 S 434-006
 (1)  
Install the jamnut on the fitting and turn to the stop.

 S 644-007

 (2)  
Lubricate the O-ring and backup ring with the applicable system lubricant.

 (3)  
Install the O-ring and backup ring on the fitting.

 S 424-009

 (4)  
Turn the fitting into the boss until it touches bottom, then loosen until the elbow is aligned with the hose or tube (one turn maximum).

 (5)  
Hold the fitting stable and tighten the jamnut.

 (6)  
Connect the elbow fitting to the hose or tube.

 S 434-008
 S 434-010
 S 434-011
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 20-10-16
 ALL  ú ú 01 Page 401 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

STRAIGHT (STYLE E) FITTINGS

ELBOW (STYLE S) FITTINGS
A 45` OR 90` ELBOW MAY BE USED JAMNUTS NAS 1410 DD, AN 6298, OR MS28773 ARE OPTIONAL

Recessed Boss Seal Fitting Installation
Figure 401

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 20-10-16
 ALL  ú ú 01 Page 402 ú Mar 15/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 TEFLON BACKUP RINGS - REMOVAL/INSTALLATION
__________________________________________
 1.  General
 A.  This procedure contains one task. The task is the installation of teflon backup rings.
 TASK 20-10-17-404-001
 2.  Install Teflon Backup Rings___________________________
 A.  Procedure
 S 424-002
 (1)  Install the teflon backup rings with the direction of the spiral clockwise and the scarfed edges as shown in Fig. 401.