Fuel Nozzle Coupling Nut Leak Check (Nitrogen Cart Connection)
Figure 501/TASK 73-11-40-991-300
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E E Feb 01/98 E E ECES E F 『 E C F M E E E E 56-5B E F 『 E C F M E E E E 56-5B ER (2) Install the correct adapter and hose from the CART, NITROGEN - FUEL R MANIFOLD PRESSURE CHECK (856A1115).
R R Fuel Nozzle Figure 502/TASK 73-11-40-991-308
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R Fuel Nozzle Post SB CFM56-5B 72-181 Figure 503/TASK 73-11-40-991-309
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(3) Disconnect the fuel supply hose from the fuel injection supply tube at the discharge end of the fuel flow transmitter.
R (4) Connect the hose and the adapter of the CART, NITROGEN - FUEL R MANIFOLD PRESSURE CHECK (856A1115) to the coupling nut of the fuel injection supply tube.
PRE SB 73-044
(5) Disconnect the drain tubes from the shroud connectors.
(6) Disconnect the shroud connectors from the fuel nozzles to get access to the fuel nozzle coupling nuts.
POST SB 73-044
(7) Disconnect the shroud connectors from the fuel nozzles to get access to the fuel nozzle coupling nuts.
END OF SB 73-044
(8) Pressurize the fuel supply manifold. WARNING : DO NOT PRESSURIZE THE FUEL SUPPLY MANIFOLD NEAR AN OPEN
_______
FLAME. A FIRE CAN OCCUR.
(a) Apply between 50 and 100 psi (5.51 and 6.89 bar) to the supply manifold.
(9) Stop the nitrogen pressure when all of the remaining fuel is removed from the fuel supply manifold.
(10) Apply a small quantity of leak-tek 160X (Material No. CP2170) to all of the coupling nuts of the fuel nozzle.
(11) Apply a minimum of 15 psi (1.03 bar) of nitrogen to the fuel supply manifold.
NOTE : The nozzle check valves usually open at between 15 and 30 psi
____ (1.03 and 2.06 bar). More than 60 psi (4.13 bar) is permitted.
(12) Slowly increase the pressure until it becomes stable at a pressure that opens one of the fuel nozzle check valves.
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(13) Examine the coupling nuts of the fuel nozzles for leaks. The leaks will be shown by bubbles in the leak-tek 160X (Material No. CP2170).
(14) If leaks are found at the coupling nuts of the nozzles, correct them as follows:
(a) Stop the nitrogen pressure.
(b) Disconnect the coupling nut.
(c) Do an inspection of the ferrule and the seating surfaces (Ref. TASK 73-11-30-200-002).
(d) Do steps (7) thru (11) again.
(15) If the coupling nut continues to show leaks, replace the fuel nozzle (Ref. TASK 73-11-40-000-002) and (Ref. TASK 73-11-40-400-002).
(16) If there are no leaks, decrease the nitrogen pressure to between 8 and 12 psi (0.55 and 0.82 bar).
R (17) Isolate the CART, NITROGEN - FUEL MANIFOLD PRESSURE CHECK (856A1115). R The pressure must not decrease more than 5 psi (0.34 bar) in three minutes.
R (18) Disconnect the CART, NITROGEN - FUEL MANIFOLD PRESSURE CHECK R (856A1115).
R (19) Remove the adapter from the nitrogen cart, (856A1115) hose.
(20) Connect the fuel injection supply tube to the fuel supply hose.
(21) TORQUE the coupling nut to between 900 and 1100 lbf.in (10.17 and
12.43 m.daN).
(22) Connect the drain shroud(s) to the fuel nozzle(s). Tighten the drain shroud by hand, plus one-eighth of a turn.
PRE SB 73-044
(23) Connect the drain tube to the fuel nozzle drain shroud. TORQUE the coupling nut to between 135 and 150 lbf.in (1.52 and 1.69 m.daN).
END OF PRE SB 73-044
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(24) Return to the fuel.
WARNING : DO NOT DRY-MOTOR THE ENGINE NEAR AN OPEN FLAME. THE GASES
_______ FROM THE FUEL IN THE COMBUSTOR CAN CAUSE A FIRE.
(a) Return to the fuel nozzle installation procedure to install hardware removed to get access to the fuel nozzle(s) and to complete the necessary tests or proceed as follows (Ref. TASK 73-11-40-400-002).
Subtask 73-11-40-410-054
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