B. Temporary Marking Materials
 S 912-005-C00
 CAUTION:_______WHEN IT IS NECESSARY, MAKE A MARK ON THE ENGINE PARTS. YOU CAN ONLY USE APPROVED MARKING COMPOUNDS. MARKING COMPOUNDS THAT ARE NOT APPROVED CAN CAUSE DAMAGE TO THE ENGINE PARTS.
 YOU MUST NOT USE GREASE PENCILS OR LEAD (GRAPHITE) PENCILS TO MAKE A MARK ON THE COMBUSTION SECTION AND HOT SECTION PARTS. THESE MATERIALS AND HEAT CAN CAUSE DAMAGE TO THE PARTS.
 (1)  The materials that follow are commercially available to make a mark on the parts:
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Material________  Manufacturer
 Chalk  Local Purchase
 Dykem (red, yellow or Dykem Company black) 2307 West 11th St. St. Louis, MO 63108
 No. 33, 44, or 55  Mark-Tex Corp.
 Action Marker  163 Coolidge Ave. Englewood, NJ 07631
 Dixon (black or  Jos. Dixon Crucible Co.
 yellow)  167 Wayne St. Jersey City, NJ 07303
 Dykem Steel Blue Dykem Company DX100
 Soapstone  Local Purchase
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
LOCK PROCEDURES - MAINTENANCE PRACTICES
_______________________________________
 1.  General
_______
 A.  This procedure tells the usual procedures to install this lock device:
 -the self-locking, hexagonal and castellated nut
 B.  This procedure tells how to attach parts with the use of these:
 -
the cotter pin

 -
the tab washer

 -
the lockwire.

 C.  The lock devices are safety devices to keep the fasteners and other parts engaged.
 D.  The lock devices prevent all opposite forces that can cause the fasteners to disengage.
 E.  Do not use the lock devices to apply or keep a torque.
 F.  The lock devices are related to safety and you must install them with the best shop procedures.
 TASK 70-20-01-912-001-C00
 2.  Install the Self-Locking, Hexagonal and Castellated Nut
_______________________________________________________
 A.  Procedure (Fig. 202)
LOCKWASHER
CASTELLATED NUT

Castellated Nut Installation
Figure 201

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S 912-002-C00
 (1)  You must examine the new or used nuts and compare them with the assembly specifications.
 (a)  You must discard the nuts that do not agree with the specifications.
 S 912-003-C00
 (2)  
Make sure the threads of a stud or bolt shank come out of the nuts with a minimum of one thread (unless otherwise specified).

 S 912-004-C00

 (3)  
Use a torque wrench to apply the correct torque values.

 TASK 70-20-01-912-005-C00
 3. Install the Cotter Pin
______________________
 A. Procedure
BENT
TAB

S-M56-MM-0313-(1)-00-B
Cotter Pin Installation Figure 202
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