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 (4)  S 864-015Let the adhesive dry fully (approximately 15 minutes).
 (5)  S 034-010Remove the masking tape or the mask.
 (6)  S 034-011Remove the release paper from the placard.
 (7)  S 424-012Put the placard on the center of the surface and install. you remove air pockets during installation. Make sure
 (8)  S 424-013Rub down placard fully with strong hand pressure and a cheesecloth pad.
 (9)  S 114-014If the primed surface shows around the placard, remove the unwanted adhesive with naphtha cleaner.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 O-RINGS - REMOVAL/INSTALLATION
______________________________
 1.  General_______
 A.  This procedure contains one task. The task is the installation of O-rings.
 B.  Use this procedure for the installation of O-rings over sharp edges. Sharp edges include threaded fasteners, keyways, slots, splines, and ports.
 C.  Before installation, examine the O-rings for cuts, abrasions,
 deformities, and surface defects.

 TASK 20-10-17-404-001
 2.  O-Rings - Installation (Fig. 401)______________________
 A.  Equipment
 (1)  O-ring Installation Tool - ST848-XXX
 B.  Consumable Materials
 (1)  Fluid used with component or system.
 C.  Procedure
 S 804-002
 (1)  
Use the applicable ST848 series O-ring installation tools. ~........................................... | | FLARED AND FLARELESS TUBE | | TOOL NO. |OR HOSE FITTING SIZE (INCH)| ............................................. | ST848-187 | 3/16 | | -250 | 1/4 | | -312 | 5/16 | | -375 | 3/8 | | -500 | 1/2 | | -625 | 5/8 | | -750 | 3/4 | | -1000 | 1 | | -1250 | 1-1/4 | | -1500 | 1-1/2 | | -1750 | 1-3/4 | 2...............…...........................1

 S 644-003

 (2)  
Apply a thin layer of the fluid used with the component or system on the O-ring.

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737-300/400/500MAINTENANCE MANUAL
 S 434-004 CAUTION: DO NOT MAKE THE ELASTOMERIC O-RING INNER DIAMETERS LARGER BY
_______ MORE THAN 50 PERCENT DURING INSTALLATION. DO NOT MAKE THE TEFLON AND PLASTIC O-RING INNER DIAMETERS LARGER BY MORE THAN 5
 PERCENT DURING INSTALLATION.  FAILURE COULD OCCUR.
 (3)  Put the thimble over the fitting.
 (4)  S 434-005Put the O-ring on the thimble.
 S 424-006

 (5)  
Move the expanding body over the thimble and against the O-ring and push the O-ring into the groove.

 S 034-007

 (6)  
Use the extracting rod to remove the expanding body from the thimble.

 

O-Ring Installation
Figure 401

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737-300/400/500MAINTENANCE MANUAL
 S 034-008
 (7) Remove the thimble.
 S 214-010
 CAUTION:_______MAKE SURE THE O-RINGS DO NOT HAVE PINCHES. MAKE SURE THE BOLTS AND FITTINGS ARE CORRECTLY ATTACHED. IF NOT, FAILURE COULD OCCUR.
 (8) Examine the O-ring for twists and pinches caused by installation.
 (a) Align the O-ring to remove twists and pinches.
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