(2)  
To do this procedure you must use the data from this task: Turn the N2 Rotor.

 B. References
 (1)  AMM 72-00-00/601, Engine
 C. Access
 (1)  Location Zones
 502/602 Fan Cowl Panel - Left
 506/606 Engine

 D. Find the Zero Index Mark on the N2 Rotor.
 S 612-049-C00
 (1)  Do this task: Turn the N2 Rotor, to get access to the drive pad to turn the N2 rotor.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
AGB (REF)
STARTER AIR DUCT
COVER  LANYARD WITH CFMI SB 72-500
(5 LOCATIONS) BOLTS 
FWD 
Figure 201 N2 Rotor Rotation Pad Cover Installation

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(2)  S 482-018-C00Do this task: Prepare for the Borescope Inspections (AMM 72-00-00/601).
 (3)  S 012-019-C00Remove the borescope port (S4) plug between the 4 and 5 o'clock position on the compressor case.
 (4)  S 482-020-C00Put the rigid borescope probe with the 90° right angle viewer and a 60° field of vision in the borescope port.
 (5)  S 982-056-C00Do these steps to find the zero index mark on the N2 rotor: (a) Turn the N2 rotor so the blades turn in a clockwise direction when seen through the borescope.
 NOTE:____ Counterclockwise when seen from the rear.
 (b) (c)  Turn the rotor until you can see the locking lug of the first blade slot (Fig. 202). 1) The locking lug is found between the blades.Turn the rotor again until you can see the next (second) locking lug.
 NOTE:____ The next blade after the second lug is the No. 1 blade.
 (d)  Align the leading edge of the No. 1 blade with the leading edge of the 4th stage vane (as seen from the rear).
 NOTE:____ This is the zero index mark.
 (6)  S 082-057-C00Do this task: Put the Airplane Back to Its Usual Condition (AMM 72-00-00/601), to remove the borescope equipment from the engine.

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 412-058-C00
 WARNING: MAKE SURE YOU DO ALL THE STEPS TO INSTALL THE COVER ON THE
_______ DRIVE PAD. IF ALL THE STEPS ARE NOT FOLLOWED, THE ENGINE CAN LEAK OIL WHEN IT IS OPERATED. INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (7)  Do the steps given in this task: Turn the N2 Rotor, to put the airplane back to its usual condition after you found the zero index mark.
 TASK 72-00-00-912-021-C00
 4. Engine Tubes, Hoses and Fittings Maintenance Practices
______________________________________________________
 A. General
REAR OF
ENGINE

FRONT OF ENGINE G-M56-NT-0030(1)-00-C
N2 Rotor Indexing Figure 202
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