(b)
Install lockwire.
S 434-026-C00
(4)
Connect the line fittings of the shroud drain to the head and rod end shrouds.
S 784-027-C00
(5)
Do a pressure test of the shrouds for leaks (Fig. 403).
(a) If the right VSV actuator is replaced, attach the pressure test hose to the parts that follow:
NOTE: Use an adjustable clamp to attach the hose.
____
1) The drain for the clearance control valve for the high pressure turbine. 2) The right VSV actuator seal and shroud drain (found at the rear drain assembly).
(b)
If the left VSV actuator is replaced, attach the pressure test hose to the left VSV actuator seal and shroud drain.
NOTE:____This is found at the rear drain assembly. Use an adjustable hose clamp to attach the hose.
(c)
Connect a dry air or a nitrogen source to the hose fitting for the pressure test. 1) Apply a pressure of 20-25 psi (138-173 kPA).
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75-31-01
ú ALL ú
ú ú ú C01.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 412Jul 12/02
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
RIGHT VSVRIGHT VSV ACTUATORBELLCRANKACTUATOR SEALSEE A ASSEMBLYAND SHROUD DRAIN
SEE B SEE C D
HPT CLEARANCE
CONTROL VALVE
FWD
HPT CLEARANCE
VSV ACTUATOR SEAL DRAIN AND RIGHT AND SHROUD DRAIN CONTROL VALVE G-M56-MM-0187(1)-00-B(M) VSV ACTUATOR SEAL DRAIN AND RIGHT CONTROL VALVE HPT CLEARANCE
A AND SHROUD DRAIN
LEFT VSV ACTUATOR SEAL AND SHROUD DRAIN
REAR DRAIN ASSEMBLY FWD B
Shroud Fitting Pressure Test Connections
Figure 403 (Sheet 1)
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75-31-01
ALL ú ú C02 Page 413 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEALANT HERE FIREWALL 6 O'CLOCK STRUT SCREW (15 LOCATIONS) APPLY THE UPPER SEAL 6 O'CLOCK FAN FRAME STRUT 6 O'CLOCK STRUT RIGHT FAIRING HALF EXTENSION SEALANT HERE INNER RING APPLY THE
JUNCTION PLATE EXTENSION RING INNER LOWER SEAL SEALANT HERE APPLY THE OUTER EXTENSION RING
C
SEE E 6 O'CLOCK FAN FRAME STRUT
HPT CLEARANCE CONTROL VALVE DRAIN AND RIGHT VSV ACTUATOR SEAL AND SHROUD DRAIN
OUTER EXTENSION RING
LEFT VSV ACTUATOR
D
JUNCTION
SEAL AND SHROUD DRAIN PLATE
G-M56-MM-0203(1)-00-C(M)
E
Shroud Fitting Pressure Test Connections Figure 403 (Sheet 2)
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ALL ú ú C01 Page 414 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(d)
Turn off the air/nitrogen supply when you have the correct pressure.
(e)
Monitor the pressure for 2 minutes.
NOTE: A maximum of 10 psi (70 kPa) decrease is permitted.
____
(f) If the pressure drop is more than 10 psi (70 kPA), apply a leak detector to each connection and do a check for leakage. 1) If leakage is found at the head and rod end shrouds,
tighten the knurled nuts by hand to stop the leakage.
2) If the leakage continues, do the steps that follow: a) Replace the o-rings if it is necessary. b) Do a leak check.
3) If leakage is found at the connections for the shroud drain line, do the step that follows: a) Make sure the tube nuts are tightened to the correct
torque value. 4) If you do not find leakage at the connections, do a check for leakage at the junction plate connection as follows:
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