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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
T L O B T U N 7/16-20 5/16-24 3/8-24 9/16-18 PART NUMBER 6-32 OR 6-40 AND STYLE PART NUMBER 4-40 OR 4-48 2-56 OR 2-64 STYLE 1-1/2-12 1-3/8-12 1-1/4-12 1-1/8-12 1-12 OR 1-14 7/8-14 3/4-16 5/8-18 1/2-20 1/4-28 10-32 8-32 OR 8-36 THREAD SIZE 0.7-0.9 0.6-0.7 1-1/8-7 NYLON NUT BACN10YJ ------1-1/4-7 1-8 7/8-9 3/4-10 5/8-11 9/16-12 1/2-13 7/16-14 3/8-16 5/16-18 1/4-20 10-24 ------------THREAD SIZE PART NUMBER AND STYLE PART NUMBER T L O B STYLE T U N ------------------------------------------LUBED BOLT DRY OR ALL ALL 1NUT TIGHTENING TORQUE 3 ---------TORQUE (N.m) TORQUE (N.m) ALL INSERTS AND TAPPED HOLES COARSE THREADED NUTS, ------1130 814 508 305 170 102 73 59 32 19 11 5 2.4 ------452-565 373-452 249-339 147-203 79-107 47-61 34-47 27-33 16-18 11-12 5.5-6 3-3.5 1.4-1.7 ------------------------4MAXIMUMDRY BOLT ALL
WHEN YOU USE THE PROCEDURE TO WRENCH THE HEAD OF THE BOLT AS YOU INSTALL IT (SUCH AS WHEN YOU INSTALL THE BOLTS INTO PLATE NUTS, CLIP NUTS, BARREL NUTS, INSERTS OR TAPPED HOLES), USE THE MAXIMUM TORQUE SHOWN IN THE TABLE FOR THE NUT |10%.
WHEN YOU INSTALL B30LE OR B30PN BOLTS WITH AN N10HR NUT, USE THE TORQUE VALUES GIVEN WITH THE N10GW NUTS.
LUBRICATED BOLTS INCLUDE DRY-FILM-LUBRICATED (MIL-L-8937) BOLTS AND BOLTS WITH ANTI-FRICTION COMPOUNDS SUCH AS EASE-OFF 990, MIL-C-11796 AND MIL-G-23827 APPLIED TO THE THREADS.
MAXIMUM TORQUE PERMITTED TO ALIGN THE CASTELLATED NUT AND HOLE WHEN YOU INSTALL A COTTER PIN OR OTHER SAFETY DEVICE.
Standard Torque Values for Bolts and Nuts (Newton meters)
Figure 203 (Sheet 3)
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70-20-02
ALL ú ú C01 Page 212 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PART NUMBER NAS1581,NAS1992,NAS1993,NAS1994,NAS1995,NAS1996 BACB30DP,BACB30EL,BACB30LL,BACB30NU,BACB30RF,BACB30UR,BACB30VF,
BOLT SIZE TORQUE 1
POUND-INCHES N.m
8-32 10-13 1-1.5
10-32 15-18 1.7-2
1/4-28 26-30 3-3.5
5/16-24 60-65 7-7.5
3/8-24 95-105 11-12
7/16-20 150-170 17-19
1/2-20 220-245 25-28
9/16-18 290-325 33-37
5/8-18 395-435 45-49
3/4-16 645-720 73-81
7/8-14 1040-1150 118-130
1-12 OR 1-14 1560-1730 176-195
WHEN YOU WRENCH THE NUT OR THE BOLT, THE TORQUE GIVEN IS FOR DRY THREADS.
Standard Torque Values for Reduced Head Bolts Figure 204
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ú C01 Page 213
ú Jul 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
BOLT OR TORQUE 1
STUD SIZE POUND-INCHES N.m
3/16-24 35-40 4.0-4.5
1/4-20 75-80 8.5-9.0
5/16-18 135-145 15.2-16.4
3/8-16 240-250 27.1-28.2
7/16-14 370-380 41.8-42.9
1/2-13 580-600 65.5-67.8
IF THE STUD HAS A DIFFERENT THREAD ON THE TWO ENDS, USE THE TORQUE GIVEN FOR THE SMALLER THREAD WHEN YOU TIGHTEN IT.
Standard Torque Values for Studs and Stepped Studs in Aluminum or Magnesium
Figure 205
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