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 5.  No. 2 Roller Bearing
____________________
 A.  The No. 2 roller bearing takes the radial loads from the fan and booster rotor. Its inner race is mounted on the fan shaft and the outer race is bolted to the No. 2 bearing support. The N1 sensor ring, mounted on the fan shaft, will take up the radial loads in case of No. 2 bearing failure and, in addition, acts as a phonic wheel for the N1 speed sensor. The rear rotating air/oil seal is mounted at the rear of the fan shaft and provides for sealing of the engine forward sump.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
C
NO. 1 BALL BEARING
REAR VIEW

A
AIR/OIL
SEPARATOR
FAN
SHAFT

WRENCHING
SLOTS

B-B
N1 SENSOR RING
NO. 1 BEARING
SLEEVE NO. 2 ROLLER BEARING
OIL BAFFLE
C-C
S-M56-MM-0906-(1)-00-B
No. 1 and 2 Bearing Support and Oil Manifold Location Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////

A
AIR
S-M56-MM-0907-(1)-00-B

Figure 2

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
6.  Oil Manifold
____________
 A.  The oil manifold is installed inside of the No. 1 bearing support. It has one tube which supplies oil to the dual oil nozzle at the No. 1 bearing and another tube which supplies oil to the single oil nozzle at the No. 2 bearing. The manifold is connected to the oil supply line of the fan frame through an oil coupling connection located at the 9 o'clock position of the bearing support.
 7.  External Piping
_______________
 A.  The external piping consists of five tubes mounted externally relative to the No. 1 bearing support (Fig. 2). These tubes connect the forward stationary air/oil seal rear face to the fan frame front face. There are three air pressurization tubes for the No. 1 bearing dual stationary air/oil seal at the 3:30, 8:30, and 11:30 o'clock positions. There is one oil scavenge tube from the forward oil sump and one oil drain tube in case of failure of the dual stationary air/oil seal.
 8.  Fan Shaft
_________
 A.  The fan shaft is a steel alloy forging. It is supported by the No. 1 and No. 2 bearings. Its front flange attaches to the fan disk. Mechanical coupling with the low pressure turbine (LPT) shaft is provided by inner drive splines with an inner shoulder for axial retention. The shaft is fitted with a rotating air/oil separator, mounted between the No. 1 and No. 2 bearings, which removes oil particles from the engine forward sump air before it is vented overboard.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FAN FRAME - DESCRIPTION AND OPERATION
_____________________________________
 1.  General
_______
 A.  The fan frame module (Fig. 1) provides front handling mounts and is the main forward support for mounting the engine to the airplane. Its purpose is to support the fan, booster and high pressure compressor (HPC) rotors, and to provide ducting for primary and secondary air flows.
　
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