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20-10-14
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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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