(c)
Do the previous steps as many times as necessary to find the point in the rotation where the torque necessary to turn the handle increases significantly.
(d)
If you cannot find the position in the rotation where the torque increases significantly, then use Procedure 2 below.
(e)
Put the shaft in the extreme counterclockwise position again.
(f)
Slowly and smoothly turn the handle of the tool clockwise until a distinct increase in torque is found and immediately stop turning the handle.
(g)
Read the scale on the tool.
NOTE: This is the point where the valve butterfly starts
____
to engage the edge of the seal.
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MAINTENANCE MANUAL
(h) Turn the handle 13 degrees more in the clockwise direction (the scale on the tool is calibrated in degrees).
NOTE: The valve butterfly is now centered on the valve seal.
____ If you turn the handle past the target value, do not turn the handle back in the counterclockwise direction again. You must start the procedure again with the handle in the extreme counterclockwise position.
S 824-058
(3) Do these steps to align the adapter shaft (Procedure 2, optional to procedure 1):
NOTE: A torque meter is necessary to do this procedure.
____
(a)
Put the tool handle in the extreme counterclockwise position.
(b)
Slowly and smoothly turn the tool handle to the extreme clockwise position while you monitor the torque that you apply to the handle.
(c)
Write down the maximum torque that you apply to the tool while you turn it from the extreme counterclockwise position to the extreme clockwise position.
(d)
Turn the tool back to the extreme counterclockwise position.
(e)
Turn the shaft clockwise again at approximately the same rate that you used before.
(f)
Stop at the position where the torque increases to approximately two-thirds of the maximum torque that you wrote down before.
(g)
Read the scale on the tool at this position.
NOTE: This is the position where valve butterfly starts to
____
engage the edge of the seal.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 燃油 CHAPTER 28 - FUEL 3(21)
