737-300 400 500 AMM 飞机维护手册 STANDARD PRACTICES - ENGINE(52)

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 g)  Hold the fitting in its position.
 h)  Tighten the locknut to the specified torque value (refer to E, Fig. 207).
 5) Install the fittings (with backup washers). a) Turn the locknut fully on the first part of the threads on the fitting and on the second part of the threads (the washer recess must point at the packing groove). b) Hold the backup washer tightly by its external edge. c) Turn the fitting into the cupped washer (refer to Fig. 207). d) Do not use lubricant. e) Continue to turn the washer on the fitting until the washer is free on the packing groove. f) Pull out all the slivers of plastic material that you cut from the washer.
FITTING  THREAD  TORQUE 
SIZE  SIZE  POUND-INCHES  N.m
-2  5/16-24  40-50  4.5-5.6
-3  3/8-24  90-100  10.2-11.3
-4  7/16-20  135-150  15.2-17.0
-5  1/2-20  155-175  17.5-19.8 
-6  9/16-18  180-200  20.3-22.6
-8  3/4-16  270-300  30.5-33.9
-10  7/8-14  360-400  40.7-45.2
-12  1-1/16-12  540-600  61.0-67.8
-16  1-5/16-12  700-850  79.1-96.0
-20  1-5/8-12  900-1050  102-119
-24 1-7/8-12 1000-1200  113-136 

Standard Torque Values for Plugs and Tube Fittings
Figure 208

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g) Push the edges of the washer into the recess in the locknut until smoothly engaged. h) Make sure the threads of the fitting has a clearance when you seat the washer. i) Lubricate and install the packing as told in the step
 before (refer to G, Fig. 207). j) Hold the locknut in its position with a wrench. k) Turn the fitting into the boss 1.5 turns. l) When it is necessary turn the fitting into the boss up
 one more turn (total 1.5 to 2.5 turns) to position it. m) Hold the fitting in its position. n) Tighten the locknut to the specified torque value
 (refer to H, Fig. 207). 6) Universal bulkhead fittings. a) Attach the bulkhead fitting to the bulkhead with a locknut (refer to I, Fig. 207). b) After you tighten the connecting tube or hose nut correctly, do this:
 -Hold the fitting with a wrench
 -Tighten the locknut to the specified torque value.
 S 912-008-C00
 (7)  Net Torque
 (a)  
At given times, procedures can give a net torque value (which is very important) to tighten a part with a force the fastener applies. 1) You must control the limits accurately to get a specified

 quantity to pull the bolt or to give an accurate quantity of hold-down pressure.

 (b)  
The net torque is equal to the gross torque minus the run-on torque.

 (c)  
The procedure to find the net torque is in the example that follows: 1) Requirement: To tighten a nut on a bolt to a net torque of

 20-40 pound-inches (2.3-4.5 N.m).
 a) Turn the nut on the bolt.
 b) Find the torque necessary to turn the nut before the

 step to tighten it. c) Write this value down as the run-on torque. d) If you think the value to be 15 pound-inches (1.7 N.m).
 2)  Add the run-on torque value you find in the step before to the minimum and maximum specified torque values.
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 |  Then:  20 inch-pounds  ( 2.3 N.m)  40 inch-pounds  ( 4.5 N.m)  |
 |  +15 inch-pounds  (+1.7 N.m)  +15 inch-pounds  (+1.7 N.m)  |
 |  ---------------- -------- ---------------- -------- |
 |  35 inch-pounds  ( 4.0 N.m)  55 inch-pounds  ( 6.2 N.m)  |
　
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