1) In some cases, where gaskets or other parts cause a slow permanent set, make sure to measure the torque at the necessary value after you engage the material.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(e) Do not tighten to the last torque value when you first tighten it.
NOTE: Tension that is not equal can cause distortion or
____
overstressing of parts.
1) Tighten the bolts to engage the mating parts, in slow and
in small steps until the parts are tightly engaged.
2) Complete the procedure to tighten all remaining fasteners
independently.
a) Tighten to the specified torque value.
3) Do not tighten more than the maximum torque values.
S 912-004-C00
(3) Torque Wrench Sizes
(a) The torque wrenches given below are recommended for use in the indicated ranges. 1) Larger wrenches have a larger tolerance, and they can cause
important errors.
NOTE: Wrench sizes given below are specified with a
____ combination Newton meter and pound-inch torque wrenches.
~.............................................................................. | TORQUE WRENCH SIZE | TORQUE LIMITS | TOLERANCE | ................................................................................ | 30 inch-pounds | 0-25 inch-pounds | |1 inch-pound | | (3.5 newton-meters) | (0-3.0 newton-meters) | (|0.1 newton-m) | ................................................................................ | 150 inch-pounds | 25-120 inch-pounds | |5 inch-pounds | | (17.0 newton-meters) | (3.0-14.0 newton-meters) | (|0.5 newton-m) | ................................................................................ | 600 inch-pounds | 120-480 inch-pounds | |20 inch-pounds | | (60 newton-meters) | (14-50 newton-meters) | (|1 newton-m) | ................................................................................ | 175 foot-pounds | 40-140 foot-pounds | |5 foot-pounds | | (230 newton-meters) | (50-190 newton-meters) | (|10 newton-m) | ................................................................................ | 250 foot-pounds | 140-200 foot-pounds | |10 foot-pounds | | (340 newton-meters) | (190-280 newton-meters) | (|10 newton-m) | ................................................................................ | 1000 foot-pounds | 200-1000 foot-pounds | |20 foot-pounds | | (1360 newton-meters) | (280-1360 newton-meters) | (|20 newton-m) | 2.........................….................................…..................1
S 912-005-C00
(4) Use an Offset Extension Wrench (Fig. 201).
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CFM56 ENGINES
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ADAPTERWRENCH HANDGRIP WHEN YOU USE A TORQUE WRENCH ADAPTER
TORQUE
DRIVE DRIVE CENTERLINE WHICH CHANGES THE EFFECTIVE LENGTH
WRENCH OF THE TORQUE WRENCH, APPLY THE FORMULA THAT FOLLOWS TO GET THE CORRECT TORQUE READING:
T x L Y =
L + E
WHEN YOU USE A TORQUE WRENCH ADAPTER WHICH CHANGES THE EFFECTIVE LENGTH OF THE TORQUE WRENCH, APPLY THE FORMULA THAT FOLLOWS TO GET THE CORRECT TORQUE READING:
T x L Y =
L - E
WRENCH ADAPTER
DRIVE = DRIVE
HANDGRIP A CORRECT TORQUE READING IS NOTCENTERLINE CENTERLINE TORQUE
NECESSARY WHEN AN ADAPTER IS USED WHICH DOES NOT CHANGE THE EFFECTIVE LENGTH OF THE TORQUE WRENCH
LEGEND T = ACTUAL (DESIRED) TORQUE Y = APPARENT (INDICATED) TORQUE L = EFFECTIVE LENGTH OF THE TORQUE WRENCH E = EFFECTIVE LENGTH OF THE EXTENSION OR ADAPTER
Use of an Offset Extension Wrench
Figure 201
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