F. Start Valve Installation
SUBTASK 80-11-03-020-005-F00
(1) Remove the protective covers from the start valve [10], the upper pneumatic starter duct [3]
and the lower pneumatic starter duct [9].
SUBTASK 80-11-03-160-001-F00
(2) Clean the flanges on the upper pneumatic starter duct [3] and the lower pneumatic starter
duct [9].
SUBTASK 80-11-03-160-002-F00
(3) Clean the flanges on the start valve [10].
SUBTASK 80-11-03-410-001-F00
(4) Install the start valve [10] as follows.
(a) Install the seal ring [1] in the ID between the start valve [10] and the upper pneumatic
starter duct [3]
(b) Install the seal ring [1] in the ID between the start valve [10] and the lower pneumatic
starter duct [9].
(c) Install the start valve [10] between the upper pneumatic starter duct [3] and the lower
pneumatic starter duct [9].
NOTE: Make sure that the key-slot in the valve flange mates with the key on the duct
flange. A maximum clearance of 0.03 inch (0.76mm) is necessary at all points
around the flange before the coupling is installed.
SUBTASK 80-11-03-410-002-F00
(5) Install the couplings [2] as follow:
(a) Loosely install the couplings [2] on the upper pneumatic starter duct [3] and lower
pneumatic starter duct [9].
(b) Tighten the coupling [2] to the torque specified on the part.
NOTE: If the torque range is not specified on the part, or it is illegible, tighten the
coupling [2] to 85 in-lb (9.6 N·m) – 100 in-lb (11.3 N·m). Overtightening of the
coupling [2] may cause deformation of the upper pneumatic starter duct [3] and
lower pneumatic starter duct [9].
(c) Lightly tap the outer surface of the coupling with a non-metallic mallet, STD-583.
(d) Tighten the couplings [2] again to the torque specified on the part.
SUBTASK 80-11-03-020-006-F00
(6) Connect the MWO312 harness electrical connector [4] to the start valve [10] receptacle.
SUBTASK 80-11-03-410-003-F00
(7) Connect the bonding jumper [6] to the start valve [10].
(a) Install the bolt [8], the bonding jumper [6], the washer [7], and the nut [5] to the start
valve [10].
SUBTASK 80-11-03-700-001-F00
(8) Measure the resistance of the bonding jumper [6] with an intrinsically safe approved bonding
meter, COM-1550.
NOTE: The maximum resistance of the bonding jumper [6] from the start valve to the engine
bracket is 0.008 ohm.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
CFM56 ENGINES (CFM56-7)
80-11-03
Page 407
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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