threads but are not seated against the retainers.
(c)
Examine the self-locking feature of the forward cone bolt nuts. 1) Apply a minimum locking torque of 32 pound-inches
(3.6 Newton meters) on the nut.
NOTE: Apply only the minimum locking torque to prevent
____ wear on the threads. It is not necessary to calculate the breakaway torque.
2) If you cannot keep the minimum locking torque, replace the nut(s) and examine the cone bolt threads for worn areas.
S 434-123-C00
(16) Do these steps to install the cone bolt nut (2) for the aft engine mount:
NOTE: To install the aft cone bolt nut, you must also do a
____ check of the self-locking feature of the cone bolt nut.
(a)
Apply antiseize compound to the threads of the nut (2).
(b)
Install the cone bolt nut (2) for the aft engine mount as follows (Fig. 419): 1) Install the washer (1) and the nut (2) on the aft engine
mount.
NOTE: The smaller diameter of the washer (1) faces
____
downward.
2) Use the wrench for the aft cone bolt nut (C71019-1) to install, but not tighten, the nut on the aft cone bolt. 3) Tighten the nut (2) until it fully engages the cone bolt threads.
NOTE: Do not seat the washer against the hanger
____
fitting.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Power Plant Installation - Bootstrap Method
___________________________________________ Install the Power Plant
(c) Do a check of the self-locking feature of the aft cone bolt nut (2) with the adapter wrench (C71001 or C71014) (Fig. 423).
NOTE: Use the adapter wrench from the right side of
____
engine.
1) Apply a minimum locking torque of 50 pound-inches
(5.6 Newton meters) on the nut.
NOTE: Apply only the minimum locking torque to prevent
____ wear on the threads. It is not necessary to find the breakaway torque.
2) If you cannot keep the minimum locking torque, replace the nut (2) and examine the cone bolt threads for worn areas.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Y T
THRUST REVERSER L STRUT
SEE A FWD E B
STRUT WRENCH TORQUE
WRENCH ADAPTER
SEE B
ENGINE MECHANIC NO. 1 (TO HOLD THE ADAPTER WRENCH) FWD
MECHANIC NO. 2
(TO TIGHTEN CONE BOLT NUT)
A
Aft Engine Mount Installation Figure 423
H56674
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71-00-02
ALL ú ú C19B Page 480I ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Power Plant Installation - Bootstrap Method
___________________________________________ Install the Power Plant
S 434-124-C00
CAUTION: YOU MUST USE A TORQUE WRENCH ADAPTOR TO TIGHTEN THE AFT CONE
_______ BOLT NUT. CALCULATE THE APPLIED TORQUE FOR THE LENGTH OF THE ADAPTER AND TORQUE WRENCH TYPE FOR THE SPECIFIED TORQUE. REFER TO THE TIGHTENING PRACTICES AND TORQUE VALUES (AMM 70-20-02/201) FOR THE CORRECT USE OF TORQUE WRENCH ADAPTERS. IF YOU INCORRECTLY TIGHTEN THE CONE BOLT NUT, THE CONE BOLT CAN BREAK.
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