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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A55053
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
3) Non-positioning fittings. a) Lubricate the packing lightly to prevent cuts by sharp threads.
b) Install the packing on the fitting so that the packing is down smoothly in the groove of the fitting (refer to A, Fig. 207).
c) Turn the fitting in the boss. d) Tighten to the specified torque value (refer to B and C, Fig. 207). 4) Install the fittings (no backup washers).
a) Turn the locknut fully on the first section of threads on the fitting (past the packing groove) and on the second section of threads.
b) Lubricate the packing to prevent cuts by sharp threads.
TUBE OD (INCH) THREAD SIZE TORQUE
POUND-INCHES N.m
PARTS ALL ALUMINUM 1 STEEL TUBE, ALUMINUM OR STEEL NUTS 2 ALL ALUMINUM PARTS 1 STEEL TUBE, ALUMINUM OR STEEL NUTS 2
1/8 5/16-24 - 40-50 - 4.5-5.6
3/16 3/8-24 30-50 90-100 3.4-5.6 10.2-11.3
1/4 7/16-20 40-65 135-150 4.5-7.3 15.2-17.0
5/16 1/2-20 60-80 180-200 6.8-9.0 20.3-22.6
3/8 9/16-18 75-125 270-300 8.5-14.1 30.5-33.9
1/2 3/4-16 150-250 450-550 16.9-28.2 50.8-62.2
5/8 7/8-14 200-350 650-770 22.6-39.6 73.4-87.0
3/4 1-1/6-12 300-490 900-1090 33.9-55.4 102-123
1.0 1-5/16-12 492-696 1340-1536 55.6-78.6 151-174
1-1/4 1-5/8-12 600-900 1600-1800 67.8-102 181-203
1-1/2 1-7/8-12 600-900 1900-2200 67.8-102 215-249
THESE VALUES APPLY WHEN THE FEMALE SEAL SURFACE IS ALUMINUM. THE MALE CONNECTOR AND THE NUT CAN BE STEEL OR ALUMINUM.
THESE VALUES APPLY WHEN THE FLARED TUBE WITH A BRAZED FERRULE AND CONNECTOR ARE STEEL. THE MALE-END FITTING AND THE NUT CAN BE STEEL OR ALUMINUM.
Standard Torque Values for Flared Tubing and Hose Fittings
Figure 206
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CFM56 ENGINES
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FITTING WITH THE O-RING O-RING INSTALLED FITTING NON-POSITIONING FITTINGS A B C THE O-RING COMPRESSED THE BOSS AND TIGHT WITH FITTINGS INSTALLED IN
FITTING O-RING AND THE O-RING INSTALLED LOCKNUT FITTING WITH THE LOCKNUT POSITIONING FITTINGS (NO BACKUP WASHERS) D E FITTING INSTALLED IN THE BOSS AND THE O-RING COMPRESSED WITH THE LOCKNUT TIGHTENED
WASHER RECESS WASHER BACKUP FITTING WITH THE WASHER PUSHED IN A RECESS AND THE O-RING INSTALLED WASHER INSTALLED FITTING WITH THE LOCKNUT AND TEFLON BACKUP LOCKNUT POSITIONING FITTINGS (WITH BACKUP WASHERS) O-RING F G H FITTING INSTALLED IN THE BOSS AND THE O-RING COMPRESSED WITH THE LOCKNUT TIGHTENED
BULKHEAD FITTING TUBE NUT LOCKNUT FITTING ATTACHED TO THE BULKHEAD WITH THE LOCKNUT TIGHTENED BULKHEAD FITTINGS I G-M56-SP-0002(1)-00-B
Installation and Tightening of Plugs and Tube Fittings
Figure 207
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
c) Install it carefully on the first section of threads and into the packing groove until it is smooth and touches the second section of threads.
d) Turn the locknut until it almost touches the packing (refer to D, Fig. 207). e) Install the fitting in the boss until the packing touches the countersunk surface. f) Loosen the fitting not more than one turn to put it in
the correct position.
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